Population Dynamics and Within-Plant Distribution of the Western Flower Thrips (Thysanoptera: Thripidae), an Early-Season Predator of Spider Mites Infesting Cotton
نویسندگان
چکیده
Environ Entomol 17(3). 551-559 (1988) ABSTRACT The season-long population dynamics and within-plant distribution of the thrips Frankliniella occidentalis (Pergande) were examined. Thrips density was highly variable and peaked in midseason. Fluctuations in density in combination with changing age structure of the population suggest that migration plays an important role in the population dynamics of thrips. The seasonal peak in thrips density corresponded with the period of peak bloom Adult thrips were strongly attracted to cotton flowers, which suggests that the migratory nature of thrips is in part caused by their preference for flower Structures. Withinplant distribution of thrips on mainstem node leaves is broad and largely overlaps that of spider mites, Tetranychus spp , a prey of thrips in early-season cotton. The combined mainstem and branch node distribution of thrips shows that during most of the season, thrips are centrally located in the plant canopy.
منابع مشابه
Population dynamics of western flower thrips (Thysanoptera: Thripidae) in nectarine orchards in British Columbia.
Development of a control strategy for thrips attacking nectarine trees depends on an understanding of their phenology, distribution, and life history as related to characteristics of nectarine orchards. To this end, we compared the overwintering behavior, distribution, and abundance of western flower thrips, Frankliniella occidentalis (Pergande), among 11 nectarine orchards located in the dry c...
متن کاملPrey Preference of the Predatory Mite, Amblyseius swirskii between First Instar Western Flower Thrips Frankliniella occidentalis and Nymphs of the Twospotted Spider Mite Tetranychus urticae
The prey preference of polyphagous predators plays an important role in suppressing different species of pest insects. In this study the prey preference of the predatory mite, Amblyseius swirskii (Athias-Henriot) (Acari: Phytoseiidae) was examined between nymphs of the twospotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) and first instar larvae of the western flower thrips, F...
متن کاملPhenology of western flower thrips Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) on plant species in and near apple orchards in Washington State
Both orchard and adjacent native vegetation harboured adult western flower thrips, Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae), from early spring until fall. Frankliniella occidentalis made up the great majority of adults collected in flowers of most plant species sampled, including apple. Other species found on apple flowers included Anaphothrips obscurus Müller, which live...
متن کاملComparison of seven methods for rearing western flower thrips Frankliniella occidentalis (Thysanoptera: Thripidae)
ABSTRACT-The species Frankliniella occidentalis (Pergande),western flower thrips, is a highly polyphagous pest and an important vector of tospoviruses on several crops and ornamental plants. Western flower thrips has been introduced throughout the world and has been subject to many biological studies including mass rearing. In this survey, seven common mass rearing methods of F. occidentalis we...
متن کاملThe first record of predaceous Scolothrips longicornis Priesner 1926 (Thysanoptera: Thripidae) in Slovakia Prvý nález zoofágnej strapky Scolothrips longicornis Priesner 1926 (Thysanoptera: Thripidae) na území Slovenska
This preliminary communication presents the first record of predaceous thrips Scolothrips longicornis Priesner, 1926 (Thysanoptera: Thripidae) in Slovakia. As a well known predator of numerous spider mites, e.g. Tetranychus urticae or Eutetranychus orientalis it has been considered as a suitable biological control agent recently. Tetranychids mites are harmful agriculture pests, causing damage ...
متن کامل