Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Inundative release of predatory stink bugs for control of Colorado potato beetle.

Abstract

The effects of both high and low release rates of nymphs of Perillus bioculatus, alone or in combination with weekly or less frequent applications of Bacillus thuringiensis subsp. tenebrionis on Leptinotarsa decemlineata was studied in Delaware. Nymphs released at either 1.6/row-m (0.5/row-ft) or 9.8/row-m (3/row-ft) significantly reduced numbers of small and large larvae of L. decemlineata in small plots. The number egg masses of L. decemlineata was significantly reduced by the high release rate as well as by the low rate in combination with a reduced spray schedule of B.t. subsp. tenebrionis. Defoliation of potato plants was significantly reduced by the high release rate. Three systemic soil insecticides (disulfoton, phorate and aldicarb) caused significant mortality of nymphs of P. bioculatus exposed to treated potato foliage 11 weeks after soil application. Four foliar insecticides had no effect on nymphs of P. bioculatus exposed to recently sprayed foliage.