Abstract
Abstract Pseudococcus longispinus Targioni-Tozzetti was studied from 1977 to 1979 in two commercial vineyards near Auckland. It was found to develop through rhree generations a year, the first two of which were synchronous. First-instar larvae moved on to the foliage at bud-burst and developed to the third instar or early adult stage before seeking shelter to reproduce. Most females reproduced under the flaking bark on the trunk of the vine, but as the season progressed many also reproduced within the vine canopy and grape bunches. Two generations were completed between mid December and leaf fall. The third generaition was born under the bark in autumn and moved on to young foliage in spring. During winter, numbers of mealybugs on the vine declined substantially. Although few corpses were found, the decline was attributed to mortality, presumably from starvation, rather than to movement to alternative host plants such as ground cover. Six predators and two parasitoids of the mealy bugs were recorded, but in numbers too low to allow analysis of their effect.
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