Augmentative Release of Predatory Mites

The effectiveness of naturally occurring predators in controlling BGM depends on predator-prey interactions. Augmentative release of predators is a feasible measure which can be used to effect the interactions toward BGM control. The objective of this study was to determine the effect of natural predators and released predatory mites (Neoseiulus fallacis) on the abundance of banks grass mite (BGM), Oligonychus pratensis (Banks), on irrigated corn, Zea mays L. The data will allow us to determine the optimal rate and timing of predatory mite release to complement the role of the natural predators in preventing BGM populations from reaching economic injury levels.

A total of 24 treatments were established representing, in factorial combination, 3 BGM densities × 2 natural predator densities × 4 predatory mite release rates. The 3 BGM density levels were low, medium, and high; the 2 predator density levels were low and high; the 4 predatory mite release rates were no release, 1:10, 1:25, 1:62.5 (ratio of released female predatory mites to field BGM females).

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