Neharkar, Dr. P. S.PANBUDE, CHETAN UTTAM.2021-05-302021-05-302019-07-22PANBUDE, CHETAN UTTAM. (2019). Biorational management of major pests of okra. Department of agricultural entomology,Nagpur. Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola. M. Sc. 2019. Print. xiv, 126p. (unpublished).https://krishikosh.egranth.ac.in/handle/1/5810169397It relates to the seasonal incidence of major pest of okra in different meteorological weather conditions and bio rational management of major pests of okra by using eco-friendly insecticides like botanicals and bio pesticides.The present investigation entitled, “Biorational management of major pests of okra” was undertaken during the kharif season of 2018 in the field of Agricultural Entomology Section, College of Agriculture, Nagpur. The trial incorporating eight treatments including control which were replicated thrice in Randomized Block Design. Jassids attained maximum (3.26 jassids/leaf) during 35th standard week and aphids attained maximum during 36th standard meteorological week (6.13 aphids/leaf) while the peak incidence of whiteflies (8.49 whiteflies/leaf) was observed during 37th standard meteorological week. Jassids showed negatively significant correlation with evaporation (r = -0. 6789**) while whiteflies populations showed positively significant correlation with minimum temperature (r = 0.5487*). The observations were recorded on the basis of shoot infestation, fruit infestation (number basis), fruit damage (weight basis) and yield of marketable fruits. Also sucking pest population were recorded on top, middle and bottom leaves of plant. During this investigation, on the basis of above parameters revealed that, lowest infestation (shoot and fruit infestation) and highest yield over control was observed in treatment of Spinosad 45 SC 0.01% (T8; 7.06%) shoot infestation, 18.40% fruit infestation on number basis and 18.63% fruit infestation on weight basis with 87.18 q/ha yield followed by, Metarhizium anisopliae CFU 1×108 (T4), Verticillium lecanii CFU 1×108 (T5), Beauveria bassiana CFU 1×108 (T6), Neem oil 2% (T1), Neem Seed Extract 5% (T3) and Karanj oil 2% (T2). In case of sucking pests all the treatments were found significantly superior over control (T8; untreated). The treatment of Spinosad 45 SC 0.01% (T7) recorded lowest aphid population of 8.45 no. of aphids/leaf, jassid population of 4.63 jassids/leaf, whitefly population 2.76 whiteflies/leaf and recorded yield of 87.18 q/ha yield of marketable fruits. The next best treatments were of Neem oil 2% (T1) followed by Neem Seed Extract 5% (T3) which recorded 74.12 and 70.95 q/ha yield of marketable fruits respectively. The next promising treatments were of Karanj oil 2% (T2) which recorded 8.96 no. of aphids/leaf, 5.88 jassids/leaf, 3.39 no. of whiteflies/leaf with 64.44 q/ha yield of marketable fruits. In the treatments, Verticillium lecanii CFU 1×108 (T5) recorded 9.29 aphids/leaf, 6.17 jassids/leaf, 3.01 whiteflies/leaf and recorded 66.82 q/ha yield of marketable fruits. Metarhizium anisopliae CFU 1×108 (T4) recorded 10.07 aphids/leaf, 5.96 jassids/leaf, 3.74 whiteflies/leaf and recorded 59.20 q/ha yield. The treatment Beauveria bassiana CFU 1×108 (T6) recorded 9.81 aphids/leaf, 6.08 jassids/leaf, 3.58 whiteflies/leaf and recorded 51.11 q/ha yield which is smallest among yield of rest of treatments but superior over control (T8) for managing the okra shoot and fruit borer infestation and sucking pests on okra. The ICBR (incremental cost benefit ratio) was also worked out to know the economy of the treatments. Higher ICBR of (32.37) was observed in treatment with the Spinosad 45 SC 0.01% (T7) next promising treatment according to ICBR were of Verticillium lecanii CFU 1×108 (T5; 23.75), Neem Seed Extract 5% (T3; 18.49), Metarhizium anisopliae CFU 1×108 (T4; 17.91), Beauveria bassiana CFU 1×108 (T6; 11.70), Neem oil 2% (T1; 9.68 q/ha), Karanj oil 2% (T2; 7.07).EnglishPlant protection, control methods, botanical insecticides.Thesis