Field experiments were conducted for two years to determine the effect of silkworm-rearing waste ... more Field experiments were conducted for two years to determine the effect of silkworm-rearing waste on the growth and yield of mulberry plants and silkworm growth and economic traits. Methodology: This study consisted of 11 treatments, including an absolute control with 3 replications. The results of this study were as follows: silkworm excreta alone (400 gm/plant yielded the longest shoot, greatest number of branches, greatest number of leaves, highest 100 leaf weight, and highest leaf yield. The silkworm excreta alone at 400 gm/plant had a signi cant and positive in uence on larval and cocoon parameters, which recorded the highest values of larval weight, single cocoon weight, shell ratio, single cocoon lament length, and denier.
Investigations were undertaken to assess the performance of new bivoltine hybrid (CSR46 X CSR47),... more Investigations were undertaken to assess the performance of new bivoltine hybrid (CSR46 X CSR47), double hybrid ](CSR6 X CSR26) X (CSR2 X CSR27)[ and bivoltine hybrid (CSR2 X CSR4) along with cross breed (PM X CSR2) in five districts of Tamil Nadu, namely Coimbatore, Salem, Dharmapuri, Pudukkottai and Tirunelveli . The result showed that double hybrid recorded significantly highest economic traits, viz., cocoon weight, shell weight, shell ratio, filament length and filament weight. The denier of double hybrid was also found to be significantly finer than all other hybrids tested. Significant difference in economic traits existed between silkworm hybrids and for the same hybrid in their performance in different districts in the present study.
Investigations were undertaken to determine the impact of bio-foliar formulations on growth of si... more Investigations were undertaken to determine the impact of bio-foliar formulations on growth of silkworm, Bombyx mori L. and economic traits of cocoon. Bio-foliar formulations such as panchagavya, vermiwash, Effective Micro-organisms (EM) and seriboost were sprayed on mulberry, Morus sp. on 15, 30 and 45 days after pruning (DAP). Leaves harvested on 60 DAP were fed to silkworm and its growth parameters were documented in the fifth instar. Larval weight (3.95 g), silk gland weight (773.12 mg), SGSTI (25.46), ERR (92.05%) and silk productivity (8.34 cg day -1 ) were statistically higher in the larvae treated with EM. Economic traits viz., cocoon weight (1.60 g), shell weight (0.379 g), shell ratio (23.78%), cocoon yield (9625.90 no.), cocoon yield (21.78 kg), filament length (1330.80 m) and filament weight (354.85 mg) were also maximum in the EM. Larval mortality, denier and renditta were reduced by 55.18, 10.66 and 9.73%, respectively over the control due to application of bio-foliar formulations.
In recent times, green synthesis of nanoparticles had received significant consideration due to t... more In recent times, green synthesis of nanoparticles had received significant consideration due to the requirement of nonhazardous chemicals, low-cost approaches, renewable materials and eco-friendly alternative to the traditional production processes because of its growing industrial applications. The present study focused on synthesis of Spirulina mediated Titanium dioxide nanoparticles (TiO2 NPs) was used to study its effects on economic traits of silkworm (Bombyx mori L.). The green synthesis of TiO2 NPs was characterized by UV, PSA, XRD, FTIR, SEM and TEM. In this study the UV-Visible absorbance spectroscopy result was found to be nanoparticles were formed at the range of 300 nm. SEM images shows that the nanoparticles are in spherical shape and TEM images shows that the nanoparticles are spherical in shape and their size range from 50 -60 nm.
The proximate and amino acid composition of both deoiled and non deoiled pupae 'eri' (Samia ricin... more The proximate and amino acid composition of both deoiled and non deoiled pupae 'eri' (Samia ricini) and 'muga' (Antheraea assamensis) and mulberry silkworm (Bombyx mori) were analyzed. Investigation revealed that silkworm pupae contained protein (40%-60%), fat (4%-20%), moisture (4%-8%), fibre (3%-6%) and ash (4%-6%). Overall protein content was highest in Antheraea assamensis pupae (63.53%) followed by Samia ricini (56.15%) and Bombyx mori (55.71%). Amongst the two types of pupae, the highest protein content was found in deoiled pupae. Amino acid analysis of silkworm pupae showed 17 amino acids, including all the essential amino acids. The total essential amino acid content is higher in mulberry pupae (50.2%) compared to Muga (46.5%) and ERI pupae (44%). The result of the study concluded that nutritive value of silkworm pupae could be utilized as a supplementary protein source in human and animal nutrition.
Experiment was conducted to study the cocoon, biological and yield related characters of selected... more Experiment was conducted to study the cocoon, biological and yield related characters of selected pure races of Bombyx mori L. Among the multivoltine races, significantly higher cocoon, biological and yield related characters were observed in AGL3 and low in Pure Mysore. Among the bivoltine races, significantly higher characters were observed in CSR2 and low in NN6D. The silk productivity had significant positive correlation with the cocoon and yield related characters whereas fifth instar larval duration, cocoon length and breadth ratio, and renditta were negatively correlated, among all the 10 pure races tested.
Juvenile hormone mimics are known to prolong larval life in insects and thus in sericulture, it h... more Juvenile hormone mimics are known to prolong larval life in insects and thus in sericulture, it has been shown to boost good cocoon and silk yield. In the present experiment, the double hybrid (FC1XFC2) silkworm was utilized and analysed the performance of economic traits. The influence of juvenile hormone mimics ie., phytojuvenoids from Pinus (Pinus roxburghii), Custard apple (Annona squamosa) and Tapioca (Manihot esculenta), a commercially available juvenile hormone mimic Serimore and Pyriproxyfen has been recorded as quantitative characters of silkworm when administered topically with two different doses at two distinct larval instars. The quantum of expression of economic trait like cocoon weight, shell weight, shell ratio, filament length and denier were found to be increasing with the increase in the number of larval treatments which is double administration at the rate of 20% and 30% concentration for Pinus and Tapioca treated larvae. In case of custard apple treated larvae, double treatment at 20% concentration showed best results. Single treatment at 5µl and 10µl concentration of pyriproxyfen gave similar outcome with respect to all economic parameters. Among all, Pinus was found to be on par with Serimore for all the economic characters.
Psoralea corylifolia is the most important medicinal plant which has various secondary metabolite... more Psoralea corylifolia is the most important medicinal plant which has various secondary metabolites and its leaves are broadly used in many sectors due to its antimicrobial activity. This study aimed to find the bio-active compounds of chloroform extract of P. corylifolia leaves using Perkin-Elmer Gas Chromatography – Mass Spectrometry (GC-MS). The results of GC-MS compounds in the chloroform extract was appropriate to the database of National Institute of Standards and Technology (NIST). GC-MS analysis of chloroform extract of P. corylifolia leaves reveal the presence of bioactive compounds as Hexadecanoic acid, 3-hydroxy-, methyl ester , Hydroxylamine, O-decyl- , 2,4-Di-tert-butylphenol ) Cubenol , Neophytadiene , Phytol , Linoleic acid ethyl esterand 9,12,15-Octadecatrienoic acid, ethyl ester, (Z,Z,Z)- ) . These bio-active compounds are mainly responsible for various biological activities. Hence, this study will make a good way for the production of various products for curing var...
The study was conducted during 2014-2016 in Dharmapuri district of Tamil Nadu. With these objecti... more The study was conducted during 2014-2016 in Dharmapuri district of Tamil Nadu. With these objectives, 90 farmers were randomly selected from Pappireddipatti, Pennagaram and Dharmapuri blocks. Thus, the total sample size was 90 for the study. The knowledge and adoption level of the mulberry and silkworm rearing technologies of the marginal farms was found to on the higher side when compared to small farms and so also the case with respect to, in large farms, the adoption level of silkworm rearing technologies in respect of silkworm race and shoot rearing were found to be encouraging. However, the majority of the sample farmers had knowledge of bed cleaning in marginal farms but practically not followed. The knowledge index of mulberry cultivation technologies in marginal farms was 57.69 per cent and small farms 55.69 per cent. In large farms the index was 56.76 per cent. The adoption index of mulberry cultivation technologies of the sample farmers in marginal farms was 34.09 per cent and small farms 35.54 per cent. In large farms the index was 40.81 per cent respectively. It was observed that the knowledge and adoption indices of silkworm rearing technologies were higher than mulberry cultivation technologies.
The present study was conducted in Dharmapuri district of Tamil Nadu. With these objectives, 90 f... more The present study was conducted in Dharmapuri district of Tamil Nadu. With these objectives, 90 farmers were randomly selected from Pappireddipatti, Pennagaram and Dharmapuri blocks. It was found that the marginal farms spent less on the marketing of cocoon followed by small and big farms. The expenditure on the marketing of 100 kg of cocoon was Rs.473.44 in big farms whereas it was Rs.384.99 in marginal farms and Rs. 418.46 in small farms. Big farms are high marketing than compared with small and marginal farms. The study concluded that in constraints faced by the sample in mulberry cultivation, silkworm rearing and marketing of cocoon. It indicated that all the sericulture farmers' labour scarcity and high wage rate as the main problem in mulberry cultivation. An analysis of the production and marketing constraints faced by the respondents in sericulture indicates that water scarcity, high wage rate, and incidence of pests and disease were the major constraints in production while price fluctuation was the major constraints in marketing.
An investigation was carried out to know the effects of different intercrops viz., clusterbean, g... more An investigation was carried out to know the effects of different intercrops viz., clusterbean, greengram, soybean, gingelly and cowpea on growth and yield parameters of mulberry, Morus alba L. The mulberry intercropped with clusterbean and cowpea recorded maximum number of branches per plant (14.00 and 12.25), number of leaves per plant (297.5 and 228.0) and shoot length (112.1 cm and 107.0 cm) and were found to be statistically superior over the mulberry without intercrop. Maximum leaf area index was registered in clusterbean (4.28). The leaf production of mulberry was boosted up by 13.40 and 11.25 per cent, when the clusterbean and cowpea respectively were intercropped. Similarly, higher leaf equivalent yield of intercrops was also observed in clusterbean (6736 kg/ ha) intercropped situation.
Among the primers used for ISSR analyses, the primer ISSR2 and ISSR3 generated highest number of ... more Among the primers used for ISSR analyses, the primer ISSR2 and ISSR3 generated highest number of fragments. All the primers exhibited 100 per cent polymorphism across 30 silkworm races analysed. The similarity coefficients ranged from 0.33 to 1.00. Of the pairwise combinations, NB7 and Kollegal Jawan showed the lowest similarity index (0.33), whereas the highest similarity index was recorded between C.nichi and P4D3 (1.00), followed by CSR3 and CSR2xCSR4 (0.98). The mean similarity index was 0.68. There was distinct grouping between the multivoltine and bivoltine races when grouped with marker generated by ISSR PCR. The 2D diagram of the PCA analysis of the markers generated by the different ISSR primers helped to visualize the two major clusters which included the multivoltines and bivoltines separately. The grouping of bivoltines in the PCA analysis clearly showed higher similarity among bivoltines as compared to the multivoltines. Superiority over the parents (Pure Mysore and CSR...
Le murier (Morus alba L.) est la seule plante hote de Bombyx mori L et est donc un composant econ... more Le murier (Morus alba L.) est la seule plante hote de Bombyx mori L et est donc un composant economique principal de la sericiculture. La culture est sujette a l'attaque par plus de 300 especes d'insectes parasites. Parmi eux, l'enrouleur de la feuille, Diaphania pulverulentalis, est important. Le parasite est distribue dans les zones sericicoles traditionnelles du Karnataka, du Tamil Nadu et de l'Andhra Pradesh. Il provoque une perte de rendement foliaire de l'ordre de 32 %, avec une incidence de plus de 70%. Le parasite a pris une grande importance non seulement parce qu'il entraine des pertes severes en matiere de rendement et de qualite de la feuille de murier, mais aussi parce qu'il sert d'hote alterne aux maladies du ver a soie comme la pebrine et la muscardine blanche. Il est donc imperatif d'adopter une strategie de Lutte Integree pour arreter la propagation de ce parasite majeur et pour la durabilite de l'industrie sericicole.
Le murier (Morus spp.) est sujet a des infestations par plus de 300 insectes nuisibles, parmi les... more Le murier (Morus spp.) est sujet a des infestations par plus de 300 insectes nuisibles, parmi lesquels l'aleurode a ponte en spirale, Aleurodicus dispersus (Russel), un insecte nuisible fondamental sur les cultures horticoles a gagne en notoriete au cours de ces quatre a cinq dernieres annees dans les zones sericicoles du sud de l'Inde. L'insecte nuisible a plus de 140 plantes hotes. Il entraine une perte moyenne de rendement foliaire de 21 %, avec une incidence de plus de 58 % chez le murier et les degâts sont importants pendant les mois d'ete. Les lesions entrainent la phytotoxemie qui provoque le froissement et la chute prematuree des feuilles, avec une infestation de moisissure charbonneuse. Non seulement le materiau blanc secrete par les jeunes mouches abime les plantes cultivees, mais il se propage egalement par le vent et entraine des genes. Les genotypes de murier S39 et China White s'averent moderement resistants a l'aleurode a ponte en spirale.
Field experiments were conducted for two years to determine the effect of silkworm-rearing waste ... more Field experiments were conducted for two years to determine the effect of silkworm-rearing waste on the growth and yield of mulberry plants and silkworm growth and economic traits. Methodology: This study consisted of 11 treatments, including an absolute control with 3 replications. The results of this study were as follows: silkworm excreta alone (400 gm/plant yielded the longest shoot, greatest number of branches, greatest number of leaves, highest 100 leaf weight, and highest leaf yield. The silkworm excreta alone at 400 gm/plant had a signi cant and positive in uence on larval and cocoon parameters, which recorded the highest values of larval weight, single cocoon weight, shell ratio, single cocoon lament length, and denier.
Investigations were undertaken to assess the performance of new bivoltine hybrid (CSR46 X CSR47),... more Investigations were undertaken to assess the performance of new bivoltine hybrid (CSR46 X CSR47), double hybrid ](CSR6 X CSR26) X (CSR2 X CSR27)[ and bivoltine hybrid (CSR2 X CSR4) along with cross breed (PM X CSR2) in five districts of Tamil Nadu, namely Coimbatore, Salem, Dharmapuri, Pudukkottai and Tirunelveli . The result showed that double hybrid recorded significantly highest economic traits, viz., cocoon weight, shell weight, shell ratio, filament length and filament weight. The denier of double hybrid was also found to be significantly finer than all other hybrids tested. Significant difference in economic traits existed between silkworm hybrids and for the same hybrid in their performance in different districts in the present study.
Investigations were undertaken to determine the impact of bio-foliar formulations on growth of si... more Investigations were undertaken to determine the impact of bio-foliar formulations on growth of silkworm, Bombyx mori L. and economic traits of cocoon. Bio-foliar formulations such as panchagavya, vermiwash, Effective Micro-organisms (EM) and seriboost were sprayed on mulberry, Morus sp. on 15, 30 and 45 days after pruning (DAP). Leaves harvested on 60 DAP were fed to silkworm and its growth parameters were documented in the fifth instar. Larval weight (3.95 g), silk gland weight (773.12 mg), SGSTI (25.46), ERR (92.05%) and silk productivity (8.34 cg day -1 ) were statistically higher in the larvae treated with EM. Economic traits viz., cocoon weight (1.60 g), shell weight (0.379 g), shell ratio (23.78%), cocoon yield (9625.90 no.), cocoon yield (21.78 kg), filament length (1330.80 m) and filament weight (354.85 mg) were also maximum in the EM. Larval mortality, denier and renditta were reduced by 55.18, 10.66 and 9.73%, respectively over the control due to application of bio-foliar formulations.
In recent times, green synthesis of nanoparticles had received significant consideration due to t... more In recent times, green synthesis of nanoparticles had received significant consideration due to the requirement of nonhazardous chemicals, low-cost approaches, renewable materials and eco-friendly alternative to the traditional production processes because of its growing industrial applications. The present study focused on synthesis of Spirulina mediated Titanium dioxide nanoparticles (TiO2 NPs) was used to study its effects on economic traits of silkworm (Bombyx mori L.). The green synthesis of TiO2 NPs was characterized by UV, PSA, XRD, FTIR, SEM and TEM. In this study the UV-Visible absorbance spectroscopy result was found to be nanoparticles were formed at the range of 300 nm. SEM images shows that the nanoparticles are in spherical shape and TEM images shows that the nanoparticles are spherical in shape and their size range from 50 -60 nm.
The proximate and amino acid composition of both deoiled and non deoiled pupae 'eri' (Samia ricin... more The proximate and amino acid composition of both deoiled and non deoiled pupae 'eri' (Samia ricini) and 'muga' (Antheraea assamensis) and mulberry silkworm (Bombyx mori) were analyzed. Investigation revealed that silkworm pupae contained protein (40%-60%), fat (4%-20%), moisture (4%-8%), fibre (3%-6%) and ash (4%-6%). Overall protein content was highest in Antheraea assamensis pupae (63.53%) followed by Samia ricini (56.15%) and Bombyx mori (55.71%). Amongst the two types of pupae, the highest protein content was found in deoiled pupae. Amino acid analysis of silkworm pupae showed 17 amino acids, including all the essential amino acids. The total essential amino acid content is higher in mulberry pupae (50.2%) compared to Muga (46.5%) and ERI pupae (44%). The result of the study concluded that nutritive value of silkworm pupae could be utilized as a supplementary protein source in human and animal nutrition.
Experiment was conducted to study the cocoon, biological and yield related characters of selected... more Experiment was conducted to study the cocoon, biological and yield related characters of selected pure races of Bombyx mori L. Among the multivoltine races, significantly higher cocoon, biological and yield related characters were observed in AGL3 and low in Pure Mysore. Among the bivoltine races, significantly higher characters were observed in CSR2 and low in NN6D. The silk productivity had significant positive correlation with the cocoon and yield related characters whereas fifth instar larval duration, cocoon length and breadth ratio, and renditta were negatively correlated, among all the 10 pure races tested.
Juvenile hormone mimics are known to prolong larval life in insects and thus in sericulture, it h... more Juvenile hormone mimics are known to prolong larval life in insects and thus in sericulture, it has been shown to boost good cocoon and silk yield. In the present experiment, the double hybrid (FC1XFC2) silkworm was utilized and analysed the performance of economic traits. The influence of juvenile hormone mimics ie., phytojuvenoids from Pinus (Pinus roxburghii), Custard apple (Annona squamosa) and Tapioca (Manihot esculenta), a commercially available juvenile hormone mimic Serimore and Pyriproxyfen has been recorded as quantitative characters of silkworm when administered topically with two different doses at two distinct larval instars. The quantum of expression of economic trait like cocoon weight, shell weight, shell ratio, filament length and denier were found to be increasing with the increase in the number of larval treatments which is double administration at the rate of 20% and 30% concentration for Pinus and Tapioca treated larvae. In case of custard apple treated larvae, double treatment at 20% concentration showed best results. Single treatment at 5µl and 10µl concentration of pyriproxyfen gave similar outcome with respect to all economic parameters. Among all, Pinus was found to be on par with Serimore for all the economic characters.
Psoralea corylifolia is the most important medicinal plant which has various secondary metabolite... more Psoralea corylifolia is the most important medicinal plant which has various secondary metabolites and its leaves are broadly used in many sectors due to its antimicrobial activity. This study aimed to find the bio-active compounds of chloroform extract of P. corylifolia leaves using Perkin-Elmer Gas Chromatography – Mass Spectrometry (GC-MS). The results of GC-MS compounds in the chloroform extract was appropriate to the database of National Institute of Standards and Technology (NIST). GC-MS analysis of chloroform extract of P. corylifolia leaves reveal the presence of bioactive compounds as Hexadecanoic acid, 3-hydroxy-, methyl ester , Hydroxylamine, O-decyl- , 2,4-Di-tert-butylphenol ) Cubenol , Neophytadiene , Phytol , Linoleic acid ethyl esterand 9,12,15-Octadecatrienoic acid, ethyl ester, (Z,Z,Z)- ) . These bio-active compounds are mainly responsible for various biological activities. Hence, this study will make a good way for the production of various products for curing var...
The study was conducted during 2014-2016 in Dharmapuri district of Tamil Nadu. With these objecti... more The study was conducted during 2014-2016 in Dharmapuri district of Tamil Nadu. With these objectives, 90 farmers were randomly selected from Pappireddipatti, Pennagaram and Dharmapuri blocks. Thus, the total sample size was 90 for the study. The knowledge and adoption level of the mulberry and silkworm rearing technologies of the marginal farms was found to on the higher side when compared to small farms and so also the case with respect to, in large farms, the adoption level of silkworm rearing technologies in respect of silkworm race and shoot rearing were found to be encouraging. However, the majority of the sample farmers had knowledge of bed cleaning in marginal farms but practically not followed. The knowledge index of mulberry cultivation technologies in marginal farms was 57.69 per cent and small farms 55.69 per cent. In large farms the index was 56.76 per cent. The adoption index of mulberry cultivation technologies of the sample farmers in marginal farms was 34.09 per cent and small farms 35.54 per cent. In large farms the index was 40.81 per cent respectively. It was observed that the knowledge and adoption indices of silkworm rearing technologies were higher than mulberry cultivation technologies.
The present study was conducted in Dharmapuri district of Tamil Nadu. With these objectives, 90 f... more The present study was conducted in Dharmapuri district of Tamil Nadu. With these objectives, 90 farmers were randomly selected from Pappireddipatti, Pennagaram and Dharmapuri blocks. It was found that the marginal farms spent less on the marketing of cocoon followed by small and big farms. The expenditure on the marketing of 100 kg of cocoon was Rs.473.44 in big farms whereas it was Rs.384.99 in marginal farms and Rs. 418.46 in small farms. Big farms are high marketing than compared with small and marginal farms. The study concluded that in constraints faced by the sample in mulberry cultivation, silkworm rearing and marketing of cocoon. It indicated that all the sericulture farmers' labour scarcity and high wage rate as the main problem in mulberry cultivation. An analysis of the production and marketing constraints faced by the respondents in sericulture indicates that water scarcity, high wage rate, and incidence of pests and disease were the major constraints in production while price fluctuation was the major constraints in marketing.
An investigation was carried out to know the effects of different intercrops viz., clusterbean, g... more An investigation was carried out to know the effects of different intercrops viz., clusterbean, greengram, soybean, gingelly and cowpea on growth and yield parameters of mulberry, Morus alba L. The mulberry intercropped with clusterbean and cowpea recorded maximum number of branches per plant (14.00 and 12.25), number of leaves per plant (297.5 and 228.0) and shoot length (112.1 cm and 107.0 cm) and were found to be statistically superior over the mulberry without intercrop. Maximum leaf area index was registered in clusterbean (4.28). The leaf production of mulberry was boosted up by 13.40 and 11.25 per cent, when the clusterbean and cowpea respectively were intercropped. Similarly, higher leaf equivalent yield of intercrops was also observed in clusterbean (6736 kg/ ha) intercropped situation.
Among the primers used for ISSR analyses, the primer ISSR2 and ISSR3 generated highest number of ... more Among the primers used for ISSR analyses, the primer ISSR2 and ISSR3 generated highest number of fragments. All the primers exhibited 100 per cent polymorphism across 30 silkworm races analysed. The similarity coefficients ranged from 0.33 to 1.00. Of the pairwise combinations, NB7 and Kollegal Jawan showed the lowest similarity index (0.33), whereas the highest similarity index was recorded between C.nichi and P4D3 (1.00), followed by CSR3 and CSR2xCSR4 (0.98). The mean similarity index was 0.68. There was distinct grouping between the multivoltine and bivoltine races when grouped with marker generated by ISSR PCR. The 2D diagram of the PCA analysis of the markers generated by the different ISSR primers helped to visualize the two major clusters which included the multivoltines and bivoltines separately. The grouping of bivoltines in the PCA analysis clearly showed higher similarity among bivoltines as compared to the multivoltines. Superiority over the parents (Pure Mysore and CSR...
Le murier (Morus alba L.) est la seule plante hote de Bombyx mori L et est donc un composant econ... more Le murier (Morus alba L.) est la seule plante hote de Bombyx mori L et est donc un composant economique principal de la sericiculture. La culture est sujette a l'attaque par plus de 300 especes d'insectes parasites. Parmi eux, l'enrouleur de la feuille, Diaphania pulverulentalis, est important. Le parasite est distribue dans les zones sericicoles traditionnelles du Karnataka, du Tamil Nadu et de l'Andhra Pradesh. Il provoque une perte de rendement foliaire de l'ordre de 32 %, avec une incidence de plus de 70%. Le parasite a pris une grande importance non seulement parce qu'il entraine des pertes severes en matiere de rendement et de qualite de la feuille de murier, mais aussi parce qu'il sert d'hote alterne aux maladies du ver a soie comme la pebrine et la muscardine blanche. Il est donc imperatif d'adopter une strategie de Lutte Integree pour arreter la propagation de ce parasite majeur et pour la durabilite de l'industrie sericicole.
Le murier (Morus spp.) est sujet a des infestations par plus de 300 insectes nuisibles, parmi les... more Le murier (Morus spp.) est sujet a des infestations par plus de 300 insectes nuisibles, parmi lesquels l'aleurode a ponte en spirale, Aleurodicus dispersus (Russel), un insecte nuisible fondamental sur les cultures horticoles a gagne en notoriete au cours de ces quatre a cinq dernieres annees dans les zones sericicoles du sud de l'Inde. L'insecte nuisible a plus de 140 plantes hotes. Il entraine une perte moyenne de rendement foliaire de 21 %, avec une incidence de plus de 58 % chez le murier et les degâts sont importants pendant les mois d'ete. Les lesions entrainent la phytotoxemie qui provoque le froissement et la chute prematuree des feuilles, avec une infestation de moisissure charbonneuse. Non seulement le materiau blanc secrete par les jeunes mouches abime les plantes cultivees, mais il se propage egalement par le vent et entraine des genes. Les genotypes de murier S39 et China White s'averent moderement resistants a l'aleurode a ponte en spirale.
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