~ 1302 ~ Journal of Entomology and Zoology Studies 2020; 8(4): 1302-1306 E-ISSN: 2320-7078 P-ISSN: 2349-6800 www.entomoljournal.com JEZS 2020; 8(4): 1302-1306 © 2020 JEZS Received: 10-05-2020 Accepted: 12-06-2020 Kanimozhi E PG Scholar, Department of Plant Protection, Anbil Dharmalingam Agricultural College and Research Institute, Tiruchirappalli, Tamil Nadu, India C Gailce Leo Justin Professor and Head, Department of Plant Protection, Anbil Dharmalingam Agricultural College and Research Institute, Tiruchirappalli, Tamil Nadu, India S Sheeba Joyce Roseleen Assistant Professor, Department of Plant Protection, Anbil Dharmalingam Agricultural College and Research Institute, Tiruchirappalli, Tamil Nadu, India T Ramesh Assistant Professor, Department of Agronomy, Anbil Dharmalingam Agricultural College and Research Institute, Tiruchirappalli, Tamil Nadu, India Corresponding Author: Kanimozhi E PG Scholar, Department of Plant Protection, Anbil Dharmalingam Agricultural College and Research Institute, Tiruchirappalli, Tamil Nadu, India Evaluation of insecticides and biorationals for the management of Leafhopper, Amrasca biguttula biguttula (Ishida) (Hemiptera: Cicadellidae) in Okra Kanimozhi E, C Gailce Leo Justin, S Sheeba Joyce Roseleen and T Ramesh Abstract Field trials were conducted at Anbil Dharmalingam Agricultural College and Research Institute, Tiruchirappalli District, Tamil Nadu, India to evaluate insecticides and biorationals for the management of leafhopper, Amrasca biguttula biguttula (Ishida) in okra during Kharif, 2019 and Rabi, 2019. The results revealed that the highest reduction of leafhopper population in Kharif, 2019 and Rabi, 2019 was recorded in dinotefuran 20 SG @ 0.30g/l (91.34 and 90.57%) followed by buprofezin 25 SC @ 2ml/l (88.36 and 87.02%). Among the biorationals, ginger + garlic + green chilli extract 5 per cent was effective with 77.91 and 76.31 per cent reduction over untreated control, respectively in Kharif, 2019 and Rabi, 2019 followed by NSKE 5 per cent and Lecanicillium lecani @ 10ml/l. Based on the moderate to high efficacy levels and low toxicity to environment and human beings, Dinotefuran 20 SG @ 0.30g/l, Buprofezin 25 SC @ 2ml/l and Ginger + Garlic + Green Chilli extract 5 per cent would be used as a potent component in IPM module for okra leafhopper, A. biguttula biguttula with limited use of insecticides. Keywords: Okra, leafhopper, A. biguttula biguttula, insecticides, biorationals Introduction Okra, Abelmoschus esculentus L. the “Queen of vegetables” is one of the important vegetable crop under the family Malvaceae grown for its green tender fruits. It is rich in calcium, ascorbic acid and iodine which help to control goiter as well as rich in protein and minerals and is cultivated in tropical, subtropical and warm temperate regions around the globe (Singh et al., 2014) [12] . India ranks second in terms of vegetable production in the world with the production of about 162897 thousand MT while it occupies the first position in okra production which is about 67 per cent of the total world’s production. In India okra occupies an area of 530.8 thousand ha with the production and productivity of 6350.3 thousand MT and 12 MT/ha, respectively (Bhatt and Karnatak, 2018) [3] . It is frequently attacked by several insect pests right from germination to till harvest. Among them, the sucking pest leafhopper, Amrasca biguttula biguttula (Ishida) is serious pest as heavy infestation of the pest leads to both nymphs and adults desap the plant tissues which results in curling and crinkling of leaves, stunted growth, hopper burn symptom and ultimate death of plants (David and Ramamurthy, 2016) [4] . Krishnaiah (1980) [9] reported about 40 to 56 per cent losses in yield of okra due to leafhopper infestation. In vegetable crops like okra, there is always small time lag between pesticide application and harvesting, farmers are unaware about use of pesticides at fruiting stage and non adoption of safe waiting period leads to accumulation of pesticide residues. The residues of non-approved pesticides were detected in 1180 vegetable sample and okra was found to have higher level of pesticide residue above Maximum Residual Limit (MRL) among those vegetables as reported by Monitoring of Pesticide Residues at National Level (MPRNL), (Anon., 2015) [1] . Considering the limitations of using insecticides alone and pesticide residue accumulation, the present study was conducted to find out the efficacy of new insecticides and biorationals to reduce the hazardous effects of the insecticides in the management of leafhopper and emphasizing the importance of biorationals as a component of IPM were carried out.