Comparative Toxicity of Certain Acaricides against Tetranychus urticae Koch and their Side Effects on Phytoseiulus persimilis A.-H. (Acari: Tetranychidae: Phytoseiidae)

Abstract

The acaricidal activity using the recommended concentrations of the novel compound cyflumetofen 24% SC as compared with bifenazate 48% SC and abamectine 1.8% EC was determined against the two-spotted spider mite, Tetranychus urticae Koch under greenhouse conditions at Faculty of Agriculture, Cairo University during 2017-2018. Their side effect on the predatory phytoseiid mite, Phytoseiulus persimilis Athias-Henriot was also investigated. Average number of mite mortality in the two seasons showed that abamectin was more toxic to predatory mite than other tested acaricides, while cyflumetofen was more toxic to spider mites T. urticae and followed by abamectin and bifenazate. Field trials proved that cyflumetofen was not as harmful as other compounds. Therefore, life-table parameters of both T. urticae and P. persimilis treated with LC 50 of cyflumetofen were investigated in laboratory to know more knowledge about the population growth of mite pest and its natural enemy under stressful of treatment. Cyflumetofen prolonged the mean generation time, doubling time while it decreased fecundity as represented by female proportion in the generation, net reproductive rate, intrinsic rate of increase, finite rate of increase and gross reproductive rate of both mite species. Cyflumetofen showed considerable negative effects on T. urticae life-tables but it had moderate or low effects on P. persimilis. It is recommended to use the novel acaricide, cyflumetofen in IPM programs of plants feeding spider mites.

New acaricide toxicity on tetranychus urticae koch, selectivity and side effect evaluations on the predatory mite phytoseiulus persimilis athias-henriot (Acari: Phytoseiidae)

“…Similar investigation study about prey and predator fitness under acaricide uses of control was for Abdel-Rahman and Ahmed [26] where in two-season experiment showed that abamectin was more toxic to the predatory mite, P. persimilis than other acaricides. While cyflumetofen was more toxic to spider mites T. urticae and followed by abamectin and bifenazate and in field trials cyflumetofen was not as harmful as other compounds.…”

Toxicological and Biological Responses of Tetranychus urticae Koch to Three Pesticides and their Side Effect on the Predatory Mite, Euseius scutalis (A.-H.)

“…Unfortunately, natural enemies are usually more susceptible to the toxic effect of the pesticides than their phytophagous preys owing to their lessdeveloped enzyme-based detoxification systems (Sato et al, 2002 andAkalach, 2006). Generally, IPM requires pesticides to be effective against target pests and, at the same time, to be relatively harmless to nontarget parasitic and predatory arthropods (Abdel Rahman and Fouly, 2001;Lee et al, 2002 andAhmed 2018). Most fungicides often have very subtle toxic effects on predaceous mites and they must be thoroughly evaluated before they are implemented in IPM programs (Bostanian et al, 2009).…”