~ 435 ~ Journal of Entomology and Zoology Studies 2019; 7(1): 435-440 E-ISSN: 2320-7078 P-ISSN: 2349-6800 JEZS 2019; 7(1): 435-440 © 2019 JEZS Received: 20-11-2018 Accepted: 24-12-2018 Anusha SB Department of Agricultural Entomology, University of Agricultural Sciences, Raichur, Karnataka, India Ghante VN Main Agricultural Research Station, University of Agricultural Sciences, Raichur, Karnataka, India Harischandra Naik R Pesticide Residue and Food Quality Analysis Laboratory, University of Agricultural Sciences, Raichur, Karnataka, India Correspondence Anusha SB Department of Agricultural Entomology, University of Agricultural Sciences, Raichur, Karnataka, India Dissipation study and persistence of diafenthiuron in green chilli fruits Anusha SB, Ghante VN and Harischandra Naik R Abstract The dissipation patterns of diafenthiuron in green chilli fruits were studied after application of diafenthiuron at fruiting stage at recommended doses (RD) and double the recommended doses (DRD). Diafenthiuron was applied at the rate of 1 g/L (225 g a.i/ha) and 2 g/L (450 g a.i/ha) on chilli fruits and the fruit samples were collected at the 0, 1 st , 3 rd , 5 th , 7 th , 10 th , 15 th , 21 st , 25 th , and 30 th day after spray. The initial deposits of diafenthiuron in chilli fruits from the two treatments were leads to 0.684 and 1.168 mg/kg with half-life of 1.35 and 2.40 days at recommended and double the recommended dose, respectively. Based on the persistence studied waiting period of 9.76 and 11.31 days is suggested for diafenthiuron on chilli from consumer safety point of view. Keywords: Chilli, dissipation pattern, diafenthiuron Introduction Chilli [Capsicum annuum L.] is one of the major spice crop in India. It is a member of Solanaceae family which represents a diverse plant group. The name is derived from Latin word Capsa that means hallow pod. Indian chillies have gained global demand due to high color value and low pungency (Mathur et al., 2000) [1] . Chillies contain potent pungent substance capsaicin, with almost 80 percent of the capsaicin being in its seeds and membranes. Besides, chillies are a good source of vitamins, minerals and beta-carotene. The capsaicin, an antioxidant is having medicinal properties. In India, Chilli was grown in an area of 136 (in ̍000 ha) and production of 3634 (in ̍000 MT) and the productivity, 11.5 (in ̍000 MT/ha) in 2016-17 (Anon., 2016-17) [2] . India is the world leader in chilli production followed by China and Pakistan. This shows that the bulk share of chilli production is held by the Asian countries, though it is produced throughout the world. At present, Karnataka ranks second in area (132.20 thousand ha) and production of chilli (148.00 thousand tonnes) after Andhra Pradesh. The pest spectrum of chilli is complex with more than 293 insects and mite species debilitating the crop in the field as well as in storage (Anon., 1987) [3] . In Karnataka, thrips, mites and white flies have been identified as key sucking pests of chilli of which leaf curl caused by mite and thrips is serious (Puttarudraiah, 1959) [4] . The yield loss due to chilli mite may go up to 96.39 percent leading sometimes to complete failure of the crop itself (Kulkarni, 1922) [5] . Chilli thrips multiply appreciably at a faster rate during dry weather periods and causes yield loss of 30 to 50 percent in South India (Vasundarajan, 1994) [6] and sometime more than 90 percent yield reduction (Krishnakumar, 1995) [7] . Chilli leaf curl complex is one of the most destructive syndrome affecting chilli in India and is considered to be caused by thrips and mites. The crop is also vulnerable to fruit borer, Helicoverpa armigera. Shivaramu and Kulkarni (2001) [8] reported 20 to 30 percent damage due to fruit borer, H. armigera. An extensive study was done on dissipation of diafenthiuron in/on chilli revealed the persistence of diafenthiuron in chilli fruits. In order to recommend a safe waiting period, it is essential to determine the dissipation behavior of diafenthiuron. Materials and Methods Field Experimentation Field experiment was carried out to evaluate the dissipation pattern of diafenthiuron 50% WP on chilli during kharif 2017 at Agricultural Entomology experimental block, Main Agricultural Research Station, UAS, Raichur in a Randomised Block Design (RBD). A hybrid HPH 5531 was used for experiment wherein, 3 treatments of the recommended dose, double the