Occurrence and development for Bemisia tabaci and Trialeurodes vaporariorum in Heilongjiang Province
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Key Words：Bemisia tabaci，Trialeurodes vaporariorus，overwinter, transmission, pulation dynamics
Abstract： The occurrence and development of Bemisia tabaci (Gennadius) and Trialeurodes vaporariorus (Westwood) was investigated in a high latitude area (Harbin, Heilongjiang Province) from 2008 to 2010. Under local climate conditions, whiteflies can only over-winter on greenhouse crops. They appeared on first-cut crops in greenhouses in May, then in fields when second-cut crops are planted in greenhouses in July and disappeared after autumn. Large whitefly densities were observed in several vegetable greenhouse fields at the end of July. Tomato and cucumber crops were most seriously affected by a virus carried by whiteflies. This caused almost total crop failure in some greenhouses. Our investigation suggested that whiteflies are an important pest in greenhouses in high latitude areas. Prevention and integrated management of whiteflies should include reducing host plants and local transmission pathways.