Thrips (Thysanoptera) Seasonal Flight Activity and Infestation of Ripe Stonefruit in Canterbury, New Zealand

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The seasonal flight activity and infestation of ripe peach, nectarine, and apricot fruit by thrips, especially the New Zealand flower thrips Thrips obscuratus (Crawford) (Thysanoptera: Thripidae) were investigated in a mixed stonefruit orchard during 3 seasons in Canterbury, New Zealand. Water trap samples indicated T. obscuratus adult numbers were low in spring (September and October), increased gradually during early summer (November and December), peaked in midsummer (mid-January), and declined in late January, with a period of moderate to low numbers throughout late summer and autumn (Febmary through May). Numbers were lowest in winter (June through August). Other common thrips species in water traps included onion thrips, Thrips tabaci Lindeman; grain thrips, Limothrips cerealium (Haliday); and Haplothrips niger (Osborn). T. obscuratus adults (almost all females), eggs, and larvae were common on ripe peaches, nectarines, and apricots. L. Cerealium adults were found on ripe fruit in small numbers but few thrips of other species were found. T. obscuratus eggs, larvae, and adults were found on fruit up to 3 wk before harvest but were most numerous on ripe fruit. T. obscuratus numbers were highest on fruit of stonefruit varieties that ripened during December and January, the time of peak seasonal flight activity, compared \vith varieties that ripened during February, March, and April. T. obscuratus adults trapped in orchard blocks appear to have originated from outside the orchard. Factors important to the population dynamics of T. obscuratus are discussed as well as economic implications.

Document Type: Research Article

Publication date: June 1, 1996

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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