~ 863 ~ Journal of Pharmacognosy and Phytochemistry 2020; 9(3): 863-866 E-ISSN: 2278-4136 P-ISSN: 2349-8234 www.phytojournal.com JPP 2020; 9(3): 863-866 Received: 23-03-2020 Accepted: 27-04-2020 Dr. Ram Prakash Sharma Subject Matter Specialist, Krishi Vigyan Kendra, Madhepura, BAU, Sabour, Bhagalpur, Bihar, India R. K. Verma Subject Matter Specialist, Krishi Vigyan Kendra, Madhepura, BAU, Sabour, Bhagalpur, Bihar, India Dr. Bipul Mandal Senior Scientist and Head, Krishi Vigyan Kendra, Madhepura, BAU, Sabour, Bhagalpur, Bihar, India Corresponding Author: R. K. Verma Subject Matter Specialist, Krishi Vigyan Kendra, Madhepura, BAU, Sabour, Bhagalpur, Bihar, India Disease management for leaf curl in Chilli Dr. Ram Prakash Sharma, RK Verma and Dr. Bipul Mandal Abstract A field trial was conducted during kharif 2019 cropping seasons. An attempt was made to find out the effective management practice through application of agrochemicals to minimize vector activites &the crop loss. Three bio rational molecules viz., Imidacloprid 17.8 SL @ 1.0 ml/3liter water, Acetamiprid 20% SP @1.0 gm/ liter water and KEM (Immunity Builder) @2.0 ml/ liter were sprayed at 15 day interval and were evaluated against vector activity to reduce the leaf curl disease incidence. The minimum disease incidence was recorded to the extent of (27.25%) coupled with highest fruit yield of 63.13 q/ha in the treatment T2 having two spraying of Acetamiprid 20% SP @1.0 gm/ liter water at an interval of fifteen days during Kharif 2019 cropping season. Maximum disease incidence (32.25%) in control with lowest yield (54.23/ha). Infection by chili leaf curl disease complex adversely affected yield attributing characters during Kharif season. Highest cost-benefit ratio of 1:11.49 was obtained by two spraying of Acetamiprid 20% SP @1.0 gm/ liter water during Kharif crop season. Keywords: chilli, leaf curl, management, immunity builder Introduction Chilli (Capsicum annuum L.) commonly known as Mirch is an economically important and widely cultivated crop of India.It is considered as one of the most important vegetable and commercial spice crops grown throughout warm temperate, tropical and subtropical regions of the World. Chilli also called red pepper belongs to the genus Capsicum under the Solanaceae family. Besides traditional use of chilli as vegetables, spices, condiments, sauces and pickles it is also being used in pharmaceuticals, cosmetics and beverages (Tiwary et al., 2005) [12] . In Koshi region of Bihar, it is grown mostly in the districts of Madhepura, Supaul and Purnia etc. Although there is a scope to enhance the productivity of chilli, a number of limiting factors have been attributed to the productivity. The damage caused by insect pests and mite is of paramount importance. Chilli is known as suffer from as many as eighty three different diseases (Anonymous, 1966) [1] . Chilli leaf curl virus is one of the major limiting factor of chilli production, which is drastically decreases yield. The significant symptoms of chilli leaf curl are Leaf crinkle or leaf curl complex was observed on chillies by Hussain, 1932. The vein clearing and leaf malformation was reported by Fernando and Pieries (1957) [3] . Curling of leaf margin, reduction in leaf size, vein clearing were observed in India, Sri Lanka and USA. Abaxial curling of the leaves accompanied by puckering, thickening and swelling of the veins were observed by Mishra et al. 1963 [5] and Muniyappa and Veeresh, 1984 [7] . Appearance of most prominent et al. symptoms such as vein clearing followed by veinal dis-tortion, swelling of veins and vein lets on dorsal side were report-ed by Muniyappa, 1980 [6] and Ravi, 1991 [11] . There were twenty four viruses reported to occur naturally on chilli, eleven viruses have been reported from India. Among all, the Chilli Leaf Curl Virus (CLCV)is the most destructive virus in terms of incidence and yield loss. In severe condition 100 per cent losses of marketable fruit have been reported by Zehra et al, 2017 [16] . Venkatesh et al. (1998) [15] reported that chilli leaf curl complex was caused by chilli leaf curl Geminivirus (CLCV) transmitted by Bemisia tabaci also by thrips (Scirtothrips dorsalis) and mites (Polyphagotarsonemus latus).Chilli leaf curl disease complex causes huge crop losses in Jharkhand state primarily due to attack of thrips, mites and white fly followed by invasion of chilli leaf curl virus (Zeeshan N and Kudada N, 2019) [17] . Chilli leaf curl viral disease complex causes huge crop and yield loss in Koshi region specially in Madhepura district of Bihar because high humidity facilitate attack of thrips, mites and white fly followed by invasion of chilli leaf curl virus. The objective of this study was to evaluate different agro chemicals on vector activities to reduce chilli leaf curl disease complex.