Resistance to the grass grubCostelytra zealandica(White) (Coleoptera: Scarabaeidae) in some crop plant species

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Abstract
Summer crops of blue lupin, yellow lupin, ryecorn, maize, and lucerne supported lower mean weight, density, and biomass of Costelytra zealandica per unit area than red clover, but these variables were similar under red clover, rape, and kale. When summer yellow lupin was followed by a winter crop of ‘Grasslands Tama’ ryegrass, larval biomass and mean weight recovered to levels similar to those under continuous red clover. In a similar rotation of blue lupin and ryecorn, larval biomass was depressed during the winter, and a high proportion of the larvae remained in the second instar. The main effect of this rotation was a marked reduction in the density of prepupae and pupae in comparison with red clover. The possible effects of this reduction on larval population in the following year are discussed.

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