The effect of agricultural chemicals used in peanut production on the predaceous earwig Labidura riparia (Pallas) was demonstrated by exposure of adult males and females to residues on glass, on foliage, and in soil. In addition, food chain toxicity was evaluated by feeding predators on Spodoptera frugiperda (J. E. Smith) larvae treated with chemicals. Toxicity to chemicals decreased with less direct routes of exposure and with time after exposure and varied with product tested. Residues of carbaryl, methomyl, monocrotophos, toxaphene and dinoseb + alachlor resulted in 100% earwig mortality in 48 h when exposed on glass. In general herbicides were more toxic than the fungicides benomyl + maneb or chlorothanlonil, but were less toxic than insecticides. The mortality level was reduced by 50-90% when the pesticide residues were on foliage compared to glass. Phorate in soil resulted in more than 85% mortality, and the herbicide vernolate in soil caused more than 50% mortality. When fed chemically treated larvae, 30-100% of earwigs were killed. The most toxic pesticide when in the food chain was monocrotophos, the least toxic ones were toxaphene and methomyl.
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Keywords: Labidura riparia (Pallas), Earwig, herbicides, Insecticides, fungicides, Pesticides, peanuts, Food chain Toxicity
How to Cite:
de Rivero, N. & Poe, S., (1981) “Response of Labidura riparia (Pallas) to Residues of Pesticides Used on Peanuts”, Peanut Science 8(2), p.93-96. doi: https://doi.org/10.3146/i0095-3679-8-2-3