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Low, medium and high densities of western flower thrips (Frankliniella occidentalis (Pergande)) were established in three greenhouses in 1996 and 1998 to investigate effects of thrips on growth, photosynthesis, yield and quality of greenhouse cucumber. Cucumber fruit were very susceptible to direct cosmetic damage by western flower thrips (WFT). High densities of WFT for short time periods significantly...
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