Effect of Pesticide Interactions on the Two-spotted Spider Mite on Peanuts1,2



Pesticides commonly applied to the foliage of peanuts in North Carolina were evaluated under field conditions for their effect on the twospotted spider mite Tetranychus urticae Koch. Most fungicides caused a higher mite increase than insecticides on NC 2 peanuts. When fungicides and insecticides were tank mixed or applied on alternate weeks, mite outbreaks occurred. These outbreaks were followed by severe injury to the foliage and finally defoliation and yield reductions.

Among the fungicides applied only Du-Ter and Copper Count failed to cause significant mite damage even when combined with an insecticide. Since mites failed to develop on untreated peanuts following six or more mite releases during the season, it was apparent that pesticides predispose peanuts to spider mite buildup and damage.

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Keywords: Twospotted spider mite, Tetranychus urticae Koch, peanuts, Ground nuts, Arachis, pesticide interactions

How to Cite: Campbell, W. (1978) “Effect of Pesticide Interactions on the Two-spotted Spider Mite on Peanuts1,2”, Peanut Science. 5(2). doi:

Author Notes

1Paper Number 5575 of the Journal Series of the North Carolina Agricultural Experiment Station, Raleigh, North Carolina 27650.

2The use of trade names in this publication does not imply endorsement of the products named or criticisms of similar ones not mentioned.