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Population response of the twospotted spider mite, Tetranychus urticae, to host phenology in corn and peanut

In northeastern North Carolina, outbreaks of Tetranychus urticae Koch on commercial corn and peanut plantings were observed to coincide with flowering and fruiting of the crop host. In greenhouse studies, when equal mite numbers were started on plants in either vegetative or reproductive growth stages, populations increased significantly more after 3–4 weeks on reproductive plants of both corn and peanut. This direct response of mite populations to differences in plant phenology appears to be an important component in the population dynamics of T. urticae. The importance of this effect in understanding mite outbreaks on corn and peanut is discussed, especially in reference to the corn‐peanut agroecosystem in North Carolina.