Bioassay of some pesticides on two-spotted spider miteTetranychus urticaeKoch and predatory mitePhytoseiulus persimilisA-H

Abstract

Trial was carried out, under laboratory conditions to evaluation the responses of the two-spotted spider mite Tetranychus urticae Koch (Acari: Tetranychidae) and predatory mite Phytoseiulus persimilis Athias-Henriot (Acari: Phytoseiidae) as Turkish (Hatay) strain against three pesticides, which were selected from different groups. The responses (mortality, sensitivity) of mite populations against pesticides were estimated by calculation the median lethal concentration (LC 50 ). According to LC 50 values, predatory mite, P. persimilis shows oversensitivity for T. urticae against bifenthrin and dimethoate. Toxicity of bifenthrin and dimethoate were classified as harmful effect according to IOBC criteria. Hexythiazox was less toxic than the other pesticides and evaluated as harmless after 24 h and moderately harmful after 72 h to P. persimilis. For this reason, hexythiazox is suitable to suggest in IPM program and ensure the preservation of predatory strain into local agro-system.

Integration of Certain Acaricides with Phytoseiulus persimilis to Control Tetranychus urticae on Beans Plants, and Their Sub-Lethal Effect on Its Life-Table Parameters تکامل المبيدات الأکاروسية مع Phytoseiulus persimilis للتحکم في Tetranychus urticae على نباتات الفاصوليا ، وتأثيرها شبه المميت على معلمات جدول حياته

“…These outcomes are consistent with those reported by Afifi et al (2015) who stated that the combination of Milbeknock 1% EC or Nimbecidine 0.03% EC with P. persimilis release was highly effective against TSSM on tomato plants in open field. Also, the same results obtained by Alzoubi and Çobanoglu (2010) they stated that the pesticides, hexythiazox, bifenthrin and dimethoate, which were combined with the predatory mites P. persimilis and Neoseiulus californicus (McGregor) were more effective in controlling TSSM than pesticides or predatory mites alone. Also, El-Saiedy and Fahim (2021) stated that releasing N. californicus and applying abamectin 3.6 % EC could be a promising strategy for controlling TSSM on strawberries.…”

Effects of Three Acaricides on the Germination Rate and Head Weight of Taskopru Garlic in Turkey

“…Toxicity of bifenthrin and dimethoate were harmful effect. Hexythiazox was less toxic than the other pesticides and evaluated as harmless [33], we found almost the same germination rate because of the negatif effects of the beneficial mites. The contact toxicity of Abamectin to beneficials such as, predatory mites Amblyseius fallacis (Garman), Phytoseiulus persimilis and nymphs of Orius insidosus (Say) (Hemiptera: Anthocoridae) was very toxic all the beneficials [34].…”

“…Dimethoate was estimated harmful for the predatory mites P. persimilis and Neoseiulus californicus, the toxicity on immature Two spotted spider mite was weak [33]. Neem oil reisdues has been evaluated no mortality on P. persimils [35].…”