Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Phenology, diapause, and overwintering of the wheat bug, Nysius huttoni (Hemiptera: Lygaeidae), in Canterbury, New Zealand.

Abstract

Populations of Nysius huttoni were studied in a 0.5 ha area of annual weeds at Lincoln, Canterbury, New Zealand. Two generations of the lygaeid developed in Stellaria media, Coronopus didymus and Polygonum aviculare between October and February in 1990-91 and 1991-92. Flight trapping indicated that a proportion of the population emigrated from the weeds soon after adult emergence when new habitats, such as patches of Chenopodium album and wheat, were colonised. Gravid females comprised 47-80% of all females dissected during the 1st generation, but only 0-9.6% of the 2nd generation. Adult survival during late winter was greatest under pine bark. In early spring, overwintered adults migrated to patches of annual weeds, fed and reproduced. The relationship between the timing of migration of 1st-generation adults and damage to wheat through grain proteolysis is discussed.