Efficacy of Commercial Insecticides against Tomato Leaf Miner Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) in Palpa, Nepal

Abstract

A survey and field experiment were conducted to evaluate the efficacy of commercial insecticides against tomato leaf miner [Tuta absoluta (Meyrick)(Lepidoptera: Gelechiidae)] under farmer’s field condition in Palpa, Nepal from February 2018 to April 2018. It consists of seven treatments replicated three times. The treatments included: Abamectin 0.15% EC (dose: 0.3ml/liter), Imidachloprid 17.8% SL (dose: 0.3ml/liter), Spinosad 45% SC (0.3ml/liter), Azadirachtin 300 ppm (5ml/liter), Chlorantraniliprole 18.5% SC (0.3ml/liter), Emamectin benzoate 5% SC (2gm/liter) and control. Treatments were applied two times at 12 days interval. From the farmer survey, Tuta absoluta was identified as the major production problem of the study area. The field experiment revealed that there was a significant effect of insecticides in larval mortality and damage reduction. The lowest percentage of leaves damage was obtained in spinosad followed by chlorantraniliprole and emamectin benzoate and the lowest fruits damage was obtained in chlorantraniliprole followed by spinosad and emamectin benzoate. Similarly, the lowest larval population in both leaves and fruits was observed in chlorantraniliprole followed by spinosad and emamectin benzoate. Average mining in infested leaves and fruits was found non-significant at all days of observation. The rate of larval population reduction over control was found highest in chlorantraniliprole followed by spinosad and emamectin benzoate. Thus, chlorantraniliprole, spinosad and emamectin benzoate were superior insecticides for management of Tuta absoluta in the field condition.

Rational Insecticides Against Tuta Absoluta in Relation to Pesticides Residue on Tomatoes

“…While, biological insecticides kept also population of the pest in levels below ETL except the last week of the experiment. The similar results were obtained by (El-Sayed et al, 2015;Azzam et al, 2017;Taha et al, 2017;Bastola et al, 2020). Who found that voliam flexi caused the highest reduction rates, followed by chlorantraniliprole and Indoxacarb.…”

A review on ecology, biology, and management of a detrimental pest, Tuta absoluta (Lepidoptera: Gelechiidae)

“…As of late, T. absoluta has been formally announced in South Asian nations like India (in Maharashtra) during October 2014, and in Nepal and Bangladesh during May 2016, separately. Further, it was found in West Asian nations including Iran in 2010 (Bastola et al, 2020;Huda et al, 2020;Khani et al, 2020;Wakil et al, 2018). Subsequently, it then spread extremely quickly all through the Mediterranean shores, including regions for North Africa and the Middle East (Desneux et al, 2011;Hogea, 2020;Jac, 2017).…”

“…Tomato leaf miner, T. absoluta attacks the tomato plant in every possible stage and reduces the massive yields of the crops (Victor & Mwangi, 2019). Thus, it is perceived as a critical leaf mining, stalk borers, and fruit harming nuisance (Abdel-baky et al, 2021;Bastola et al, 2020;Jac, 2017). Throughout the country, it is a major factor behind the reduced production of tomatoes in both greenhouse and open field conditions (Gozel et al, 2020;Han et al, 2019;Munyua & Bream, 2017).…”

Tuta absoluta; A Devastating Pest of Tomato: A Review

“…Tuta absoluta is a potentially very damaging pest and is difficult to control as it feeds inside the plant leaf and fruit and can develop resistance to several insecticides (Siqueira et al, 2000). Bastola et al (2021) during study reported Chlorantraniliprole to be the most effective insecticide against T.absoluta followed by spinosad and emamectin benzoate. Braham…”

“…The major insect pests of tomato are tomato fruit borer (Helicoverpa armigera), leaf miner (Liriomyza trifolii), and whiteflies (Bemisia tabaci) which spreads tomato yellow leaf curl virus. Moreover, the tomato leaf miner (Tuta absoluta), has been recently introduced to Nepal in 2016 which can incur a huge loss in tomato production and has become an increasingly important pest with a huge loss in Nepal (Bastola et al, 2021, Joshi et al, 2017. This pest was recorded first time from Kathmandu valley in May 2016 and has been spread to the nearest districts to Kathmandu; Kavrepalanchowk, Dhading, and Nuwakot (Bajracharhya et al, 2016).…”