• Ram Singh

      Articles written in Proceedings – Animal Sciences

    • Development and survival ofMythimna separata (Wlk.) on some host plants during winter at Hisar

      Ram Singh J P Chaudhary

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      Survival and post embryonic development of the oriental armyworm,Mythimna separata (Wlk.) was studied on 5 host plants, viz sorghum, maize, sugarcane, Johnson grass and napier grass during winter months (15 November to 7 March) under laboratory conditions. Variations in different parameters like larval survival (10·3–60·3%), size of larvae (7·33–29·67 mm), larval weight (25·5–493·1 mg for 26 days old larva), size of pupa (15·0–16·49 mm), pupal weight (184·9–249·5 mg for 2–4 days old pupa), pupation (3·3–38·9%), developmental period (74·8–109·8 days) and moth emergence (3·4–50·0%) were significant on different foods. Low temperature and humidity conditions during experimental period resulted in complete mortality of female pupae reared on napier grass, Johnson grass and maize whereas in case of males 60–100% moths were crippled winged. However, adults emerged on sorghum and sugarcane foods were normal except 28·7% males in sorghum were crippled. Total growth index was also higher on sugarcane (0·45) and sorghum (0·24) indicating their suitability in carrying over of winter pest population.

    • Effect of okra fruit blocks, seeds and pericarp on post-embryonic development ofEarias vittella (Fab.) in relation to some phytochemicals of selected okra genotypes

      Ram Singh

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      Post-embryonic development of the spotted bollworm,Earias vittella (Fab.) studied on pericarp, seeds and fruit blocks of 8 okra genotypes, revealed significant differences in larval survival, larval period, pupation and adult emergence among genotypes as well as fruit components. First instar larval survival on fruit components was in the order of fruit blocks> seeds> pericarp> axil. Mean total developmental period was 24·20, 21·33 and 21·09 days on pericarp, seeds and fruit blocks, respectively. Likewise pupation was 25·30, 65·42 and 71·58% on pericarp, seeds and fruit blocks, respectively. Primary phytochemicals, like protein, free amino acids, total sugars, non-reducing sugars and moisture content in pericarps were in higher concentrations in comparison to seeds and whole fruits. These compounds also differed significantly among genotypes. There were positive correlations between the pest survival and these nutritional compounds. Tannins were 0·35, 0·23 and 0·29% in pericarp, seeds and whole fruits, respectively. Tannin content was significantly higher in pericarps of tolerant genotypes and showed significant negative correlation (r=−0·81) with fruit borer survival.

    • Role of chemical components of resistant and susceptible genotypes of cotton and okra in ovipositional preference of cotton leafhopper

      Ram Singh R A Agarwal

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      Ovipositional preference of cotton leafhopper,Amrasca biguttula biguttula (Ishida) on resistant and susceptible genotyps of cotton and okra was found under the influence of chemical components. The non-reducing sugars, tannins, silica and free gossypol in the leaves showed significant and negative correlation with the number of leafhopper eggs.

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