Anitha Chitturi, anithac@uga.edu, University of Georgia, Department of Entomology, Coastal Plain Experiment Station, P.O.Box 748, South Entomology Drive, Rainwater Rd, Tifton, GA and David G. Riley, dgr@uga.edu, University of Georgia, Department of Entomology, Coastal Plain Experiment Station, Rainwater Rd, Tifton, GA.
The availability of pollen has been found to positively influence the growth, development and fecundity of thrips. Studies indicated that Pinus species pollen could increase the reproduction potential of thrips species that are vectors of Tomato spotted wilt virus. Pine pollen deposition in Georgia occurs in the spring (March to April) which is just prior to the peak thrips population in flowers of vegetable crops. Based on this observation it is likely that ambient pollen affects thrips vector population dynamics on regional basis. The proportion of tomato spotted wilt virus vectors and consequently the level of epidemics are to some extent determined by the settling and ovipositional behavior of female thrips. The effect of pine pollen on settling behavior and reproduction which consequently affects the tomato spotted wilt virus transmission has not been investigated thoroughly. The current paper studied two behavioral patterns, settling and oviposition behavior of Frankliniella occidentalis (western flower thrips) and Frankliniella fusca (tobacco thrips) using a bioassay on intact tomato and peanut leaves. Intact tomato and peanut leaves, either untreated or treated (dusted) with pine pollen were used to quantify thrips settling and ovipositional behavior. Results indicated that, the effect of pine pollen on settling and ovipositonal behavior is species specific. Greater oviposition and settling occurs with Frankliniella occidentalis (western flower thrips) on pollen treated leaves than on untreated leaves.
Species 1: Thysanoptera Thripidae
Frankliniella occidentalis (western flower thrips)
Species 2: Thysanoptera Thripidae
Frankliniella fusca (tobacco thrips)
Keywords: Pine pollen, Settling behavior
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