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Mysore, India

The seasonal differences in the environmental components considerably affect the genotypic expression in the form of phenotypic output of silkworm crop such as cocoon weight, shell weight, and cocoon shell ratio. The variations in the environmental conditions day to day and season to season emphasize the need of management of temperature and relative humidity for sustainable cocoon production. The present review paper discuss in details about the role of temperature and humidity on growth and development of silkworm including recent studies on heat shock protein. Study also discusses the influence of air and light on silkworm development. In addition to this study emphasis on the role of various environmental factors on embryonic development of silkworm egg, nutritional indices of silkworm larva and reproductive potential of silkworm moth. The study also highlights about the care to be required during silkworm spinning and influence of temperature and humidity on post cocoon parameters of silkworm. The study included future strategies to be taken for the management climatic condition for successful cocoon crop. The paper covers 140 references connected with the topic. © 2012 V. K. Rahmathulla. Source

Rahmathulla V.K.,P3 Basic Seed Farm | Kumar C.M.K.,P3 Basic Seed Farm | Angadi B.S.,Head Quarter | Sivaprasad V.,Head Quarter

The production of quality mulberry leaf and subsequent production of quality silk is hampered due to the incidence of various insect pests. The present study analyses the population dynamics of Diaphania pulverulentalis (leaf roller), a serious pest of mulberry in a sericulture seed farm. The results indicated that maximum population buildup of the pest was recorded during rainy season. High humidity coinciding with low temperature because of southwest and northeast monsoon was conducive for breeding and multiplication of the pest. Correlation studies revealed that there was a significant negative correlation between increase in temperature and pest infestation. All other weather factors recorded from the study location have a positive correlation with incidence of the pest. The regression model developed also supported the relationship between the pest population buildup and weather factors. © 2012 V. K. Rahmathulla et al. Source

Rahmathulla V.K.,P3 Basic Seed Farm | Kishor Kumar C.M.,P3 Basic Seed Farm | Angadi B.S.,National Silkworm Seed Organization | Sivaprasad V.,National Silkworm Seed Organization
Journal of Entomology

Change in climate involving temperature variation influences the incidence of microsporidiosis in silkworm. As microsporidian disease in silkworm is epidemic, transovarially transmitted to progeny eggs and prevention of the disease is very vital in parental silkworm seed multiplication. The impact of different climatic conditions viz., summer, rainy and winter on the incidence of microsporidian disease in silkworm was studied at a sericulture Basic Seed Farm, at Mysore, Karnataka, India as a part of the regular monitoring and control of the disease carried out for a period 3 years (2008-10). The results indicated that the disease incidence was higher during the beginning of winter season (October-November) followed by rainy season (July-September) and the incidence was least in summer season (March-May). Correlation analysis showed that the incidence was correlated positively with humidity and negatively with temperature recorded from the study location. © 2012 Academic Journals Inc. Source

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