Evaluation of certain pesticides and their alternatives against the black vine thrips, Retithrips syriacus (Mayet) (Thysanoptera: Thripidae) infesting grapevine

Abstract

The black vine thrips, Retithrips syriacus Mayet (Thripidae: Thysanoptera) is considered as pest. Adults and nymphs of this pest causes a serious damage to grapevine leaves. The experiments were carried out to evaluate the toxicity of seven pesticides on nymphs and adults of GVT on Flame seedless and Superior commercial vineyard varieties under laboratory and field conditions during 2016/2017 season. Data clearly indicate that the order of efficiency of the tested compounds were the same at both LC50 and LC90 levels. The tested insecticides could be descendingly arranged as follows: Radient, Pleo, Movento, Nanoparticles Zinc oxide, Marshal, KZ oil and Garlic extract. The corresponding LC50 values were 0.1, 0.24, 0.9, 0.92, 1.33, 1.45 and 1.5 ppm, while the LC90 values were 0.87, 1.07, 5.48, 10.92, 8.67, 6.42 and 11.26 ppm, respectively. On the other hand, χ2 values were 5.77, 2.93, 3.95, 3.08, 6.54, 2.87 and 1.51 respectively. Radient had the steepest toxicity line and Garlic extract had the flattest, however Pleo, Movento, Nanoparticles Zinc oxide, Marshal and KZ oil lie in between. This reflects the superiority of Radient and inferiority of Garlic extract. Radient was the most toxic compound, whereas Garlic extract was the least toxic one. the initial reduction of KZ oil (71.83, 72.80, 71.50 and 70.95) in both varieties and all of them are above 70% reduction. From these results, it should be suggested using of some effective alternatives such as KZ oil for controlling black vine thrips in compatible program with chemical insecticides instead of conventional individuals' insecticides. Keywords: Insecticides; Retithrips syriacus; Thrips; Grapevine

Efficacy of some compounds against Thrips tabaci Lind. infesting onion plants at Sohag Governorate, Egypt

“…for B. bassiana and M. anisopliae isolates. Allam et al (2020) stated that spinetoram was the most toxic compound against the black vine thrips with LC 50 and LC 90 values of 0.1 and 0.87 ppm, respectively, however, the lower toxicity was observed for KZ oil and garlic extract. Also, our results were found in the same line with those obtained by Chen et al (2022), Kilaso (2022) and Rao et al (2022).…”

“…For safe materials, only chili extract gave reduction > 50%, with mean reduction percentage of 51.06% in 2021/2022 season. Many investigators studied the control of thrips by synthetic insecticides, (Allam et al, 2020;Negash et al, 2020;Khan et al, 2022;Nadeem et al, 2022;Geremias et al, 2022;Ihsan et al, 2022), they reported that spinetoram, emamectin benzoate and pyridalyl were the most effective against T. tabaci. The effect of alternative materials as safe compounds for onion thrips control has been studied by many authors.…”