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Lethal and Sublethal Effects of Methyl Benzoate on the Predatory Bug Nesidiocoris tenuis.

Insects (2020-06-24)
Md Munir Mostafiz, Errol Hassan, Jae-Kyoung Shim, Kyeong-Yeoll Lee
ABSTRACT

Benzoates (naturally occurring plant toxins) produce pesticidal effects on various pest insects and mites, but their effects on non-target insects are poorly understood. In this study, we evaluate the lethal and sublethal toxicity of methyl benzoate (MB) to adults of the generalist predatory bug Nesidiocoris tenuis (Reuter) (Hemiptera: Miridae). To assess lethal effects, N. tenuis was exposed to plant surfaces treated with 0.25%, 0.5% and 1% MB, as well as negative and positive controls (water and the neonicotinoid acetamiprid, respectively). Exposure to 1% MB resulted in the highest corrected mortality of 17.8% and 13.3% under laboratory and greenhouse conditions, respectively. Thus, 1% MB can be classified as harmless to N. tenuis according to the International Organization for Biological Control rating scheme. At the sublethal level, MB exposure did not significantly affect the consumption of eggs of the whitefly Bemisia tabaci by N. tenuis relative to negative control feeding rates. In contrast, acetamiprid at the manufacturer's recommended concentration reduced N. tenuis feeding activity by 45.4%. Furthermore, in a Y-tube olfactometer assay, there were no significant differences between the olfactory responses of N. tenuis to MB concentrations and the negative control (water). This study therefore suggests that MB could be used safely for pest control in combination with N. tenuis.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
TWEEN® 80, viscous liquid
Sigma-Aldrich
Methyl benzoate, 99%
Sigma-Aldrich
ECO TWEEN® 20, viscous liquid
Sigma-Aldrich
TWEEN® 20, viscous liquid
Sigma-Aldrich
ECO TWEEN® 80, viscous liquid