~ 882 ~ Journal of Pharmacognosy and Phytochemistry 2019; 8(2): 882-886 E-ISSN: 2278-4136 P-ISSN: 2349-8234 JPP 2019; 8(2): 882-886 Received: 15-01-2019 Accepted: 19-02-2019 Mahendra Singh Research Scholar, Department of Entomology, SKNCOA, SKNAU, Jobner, Rajasthan, India Dr. DK Bairwa Assistant Professor, Department of Entomology, SKNCOA, SKNAU, Jobner, Rajasthan, India Basant Kumar Dadrwal Research Scholar, Department of Plant Physiology, IAS, BHU, Varanasi, Uttar Pradesh, India Jyoti Chauhan Research Scholar, Department of Plant Physiology, IAS, BHU, Varanasi, Uttar Pradesh, India Correspondence Mahendra Singh Research Scholar, Department of Entomology, SKNCOA, SKNAU, Jobner, Rajasthan, India Relative efficacy of new generation insecticides against sucking insect pests of Green gram Mahendra Singh, Dr. DK Bairwa, Basant Kumar Dadrwal and Jyoti Chauhan Abstract A field experiment was conducted to determine the relative efficacy of different newer insecticides against sucking insect pest viz., white fly (Bemisia tabaci), jassid (Empoasca kerri), infesting Green gram at Agronomy Farm, S. K. N. College of Agriculture, Jobner (Rajasthan) during Kharif. The efficacy of eight insecticides tested against insect pest of green gram revealed that acetamiprid (0.004%) proved to be the most effective followed by imidacloprid (0.005%) and fipronil (0.01%). The treatments of thiamethoxam (0.005%) and dimethoate (0.03%) stood in middle order of efficacy followed by the treatments of spiromesifen (0.001%) and fenpropathrin (0.05%) which were proved to be least effective against insect pest of green gram. The total avoidable loss and percent avoidable loss was found to be zero in the treatment of acetamiprid (0.04%), whereas, maximum in spiromesifen (0.001%). Keywords: Insecticides, sucking insect pests, jassid, whitefly, spiromesifen, fenpropathrin Introduction Green gram [Vigna radiata (L.) Wilczek], (synonyms, Phaseolus aurius Roxb., Phaseolus radiatus L.) It is one of important pulse crops for diversifying cereal-based cropping systems worldwide. In India pulses have been considered poor men meat, also play major role in sustainable agriculture because pulses improve soil fertility through nitrogen fixation. It is estimated that, in India pulses are grown in 25.22 million ha, area yielding 19.27 million tones with an average yield of 764 kg ha -1 (Anonymous 2013-14 a). In India during 2013-14 Green gram was cultivated on 3.28 million ha area and its production and productivity was 1.55 million tones and 317 kg ha -1 , respectively (Anonymous 2013-14 a). It enhances the soil fertility by absorbing the atmospheric nitrogen, so it is used as a green manure crop. It is also used as cattle feed along with roughage crops. The most serious insect pests attacking on green gram includes white fly (Bemisia tabaci), jassid (Empoasca kerri). Although there are various risk associated with Insecticide application but, still is has been considered as one of the most effective and quickest method of reducing insect pest population in the field. More often it forms the only solution to manage the out breaks of insect pests. Keeping this view present study was conducted to find out the efficacy of certain newer insecticides against sucking insects pests of green gram The indiscriminate use of insecticides has resulted in severe problems like development of resistance by insects to insecticides, resurgence of insect pests, outbreak of secondary pests, problem of residues, toxicity to non target organisms, environmental pollution etc. However, in spite of these, newer insecticides have come to stay in our modern farming, which may not be dispensed off due to their efficacy and economic. Materials and Methods The present investigations were carried out at S. K. N. college of Agriculture, Jobner, during kharif, 2015. Being a leguminous crop, green gram needs a small quantity of nitrogen for early growth period. Fertilizers were applied at the rate of 20 kg of nitrogen per hectare as a starter dose and 40 kg phosphorus per hectare in the soil before sowing. The details regarding insecticides and their concentration or dosage have been presented in table 1. There were eight treatments including control (untreated). The insecticides were applied when sufficient population of jassid and whitefly were built up on the plants. The crop was sprayed for the first time on 13 th August by using a foot sprayer and second application was made three weeks after first application. The re-build up of population was observed at this stage. The spray solution used for spraying the crop was 600 l ha -1 .