Yadav, SatyapalDeepak2020-01-042020-01-042019http://krishikosh.egranth.ac.in/handle/1/5810139331The Present studies entitled “Biology, population dynamics and management of Tobacco caterpillar (Spodoptera litura, Fabricius) on Castor” were carried out during Kharif, 2018. Biology of the S. litura was studied in laboratory of Department of Entomology, Chaudhary Charan Singh Haryana Agricultural University, Hisar. Total life cycle of S. litura varied from 21 to 37 days with an average period of 34.85 ± 3.44 days with a male-female ratio of 1:1.4 and adult emergence percentage was 86.66 per cent. Population dynamics of the insect pests and management of S. litura was carried out at the research farm of the Regional Research Station, Bawal. Castor semilooper was first observed during second week of August and continued to infest castor crop up to mid of October with a peak population of 6.0 larvae per plant during last week of August. The incidence of S. litura started during first week of September and continued up to first week of November with peak population level of 3.4 larvae per plant during second week of October. The infestation of D. punctiferalis initiated from third week of October and last till second week of March with a peak infestation of 12.20 per cent during second week of December. The infestation of capsule borer was positively significantly correlated with maximum temperature and showed highly positive significant correlation with maximum temperature (r = 0.775**). The attack of E. flaviscens started from second week of October to third week of February with a peak population 16.2 nymph/3 leaves/plant during first week of November. The incidence of E. flavescens showed highly positive significant correlation with maximum temperature (r = 0.913 **). Experiment on management of S. litura was conducted at RRS, Bawal and revealed that after first spray it was observed that among all the treatments standard check (Quinalphos 300g a.i. per ha) was most effective against S. litura while among bio-pesticides NPV- Sl 350 LE/ha was most effective and at par with treatment Bt var. kurstaki @2kg/ha. The least effective treatment was Neem oil 5% (crude oil) followed at par by NSKE 5 %.ennullThesis