STUDIES ON THE VARIETAL PREFERENCE OF VARIOUS INSECTPESTS TO BHENDI (Abelmoschus esculentus L.)
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Date
1989
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AAU, Anand
Abstract
The study on population dynamics of various insectpests damaging to different varieties of bhendi (Abelmoschus esculentus L.) screened under field conditions during kharif 1987 and 1988 indicated that aphid, Aphis gossypii G. and jassid , Amrasca biguttula biguttula I. incidence on all the varieties was high and for a longer period during kharif 1988 as compared to kharif 1937. However, jassid population was low on Selection-2 and GO-1 as compared to Padra 18-6. The damage of shoot and fruit borer, 'E. vittella F. to shoots of different bhendi varieties was observed during August. The damage of 'Farias to shoots of Selection-2 was comparatively less than other varieties. The incidence of E. vittella in the fruits was started from the third week of August and continued till removal of crop. However, in the early part of the fruit formation, fruits of Punjab Fadiniai and Selection-2 were less damaged than other varieties. The incidence of yellow vein mosaic disease in all the 'bhendi' varieties started from middle of August, however, PB-57 (Tarhhani Kranti) was completely free from disease throuihout the crop season. Significant positive correlation, was found between disease incidence and maximum temperature. None of the 'Bhendi' varieties was found resistant/ tolerant to aphid and jassid. However, bhendi varieties GO-l, Selection-2, PB-57 and Punjab ladmini were found resistant / tolerant to shoot and fruit borer, E. vittella whereas, Padra 18-6 and Fusa Sawani were moderately susceptible . The variety PB-57 (Parbhani Kranti) was completely free from yellow vein mosaic disease. The study on the effect of different 'bhendi' varieties on biology of E. vittella revealed that larvae reared on Padra 18-6 had a long larval period and short pupal periodo whereas longevity of male and female moths was long from the larvae reared on Padra 18-6 and Pusa Sawani, respectively. Inoubatioa period of eggs laid by moths obtained by rearing on Punjab Padmini was long. Ihe ahorteat life span of male and female Earias was found on Pusa Sawani and Selection-2, respectively, whereas, longest life span of male was observed on PB-57 and female on Pusa Sawani. Hale to female ratio was 1:1 on Punjab paimini whereas mora males were emerged by rearing on Selection-2. Female moth emerged from larvae reared on PB-57 had short pre-oviposition and long ovi-position period, whereas moths obtained from Selection-2 had long preoviposition and short ovi-position period. Post-oviposition period of moths obtained from Padra 18-6 and piisa Sawani was short and long, respectively. The minimum and maximum larval mortality was found in larvae reared on Pusa Sawani and GO-l respectively. The minimum and maximum larval penetration was found in fruits of Selection-2 and Pusa Sawani, respectively. Fruits of all the six 'bhendi' varieties were equally preferred for oviposition.
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AGRICULTURAL ENTOMOLOGY, AGRICULTURE, A STUDY