POPULATION DYNAMICS AND CONTROL OF EARIAS VITTELLA FABRICIUS (LEPIDOPTERA : NOCTUIDAE) ON COTTON AND BHENDI
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Date
1998
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AAU, Anand
Abstract
Studies were carried out on population dynamics of spotted bollworms, Earias vittella Fab. and it's natural enemies on cotton H-6 and bhendi Parbhani Kranti, behaviour of E. vittella moth by using sex pheromone trap, bioefficacy of botanical and synthetic insecticides against E. vittella and comparative toxicity of recommended synthetic insecticides for E. vittella to it's larval parasite Rogas aliearhensis during 1996-97 to 1997- 98. The activity of E. vittella was started on cotton H-6 from five weeks age of the crop and continued till at the age of twenty thee weeks of crop when crop was removed. In kharif and summer bhendl it's activity was started from three and four weeks age of the crop and remained till fifteen and fourteen weeks age respectively when crop was removed. Summer bhendi had higher activity of E« vittella than kharif bhendi. The oviposition behaviour of E. vittella infesting cotton showed positive relationship with maximum temperature and negative relationship with windspeed and relative humidity (morning, evening and mean), whereas larval activity had positive and negative relationship with range of temperature and rainfall as well as evening relative humidity respectively. Lin kharif bhendi, bright sunshine hours and temperature (maximum and mean) showed positive influence on larval activity, whereas mean vapour pressure and relative humidity (morning, evening and mean) showed negative effect. Maximum and mean temperature showed positive influence on E. vittella activity in summer bhendi The larval parasite R. aligarhensis and larval pupal parasite Agathia spp. were found as major parasites of E. vittella infesting cotton and kharif bhendi respectively, whereas E. vittella larvae infesting summer bhendi were found parasitized by E. aligarhensis. Agathis spp. and Chelonus spp. The range of temperature showed positive influence, whereas windspeed, vapour pressure (morning, evening and mean) and relative humidity had negative influence on the activity of R. aligarhensis in cotton, whereas rainfall showed positive influence on activity of parasites in summer bhendi.
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Agricultural Entomology, A Study