Study on immigration of whitefly, Bemisia tabaci to soybean field by using sticky trap
2000
Boontiwa Wichitwatee | Srisamorn Pitaksa | Turnjit Satayavirut
Study on immigration of whitefly, Bemisia tabaci by using sticky traps was conducted at Prabuddhab Field Crops Research Station in rainy season (during July-November 1998), and at Chainat Field Crops Research Center in dry season (during December 1997-March 1998 and January-March 1999). The yellow, light lemon yellow and white sticky traps were placed 8 points around the soybean field. The distance between each point was 20 metres. The efficacy of sticky traps were placed 8 points around the soybean field. The distance between each point was 20 metres. The efficacy of sticky traps was analysed by RCB with 3 treatments and 10 replications. The result showed that the yellow and light lemon yellow sticky traps could be used to predict whitefly density and its immigration to soybean field. The population fluctuation of whitefly adults and nymphs showed two peaks of outbreak in each season. In rainy season, the first peak of adult whitefly population was found on R3 (beginning pod) of soybean growth stage and the second was on R6 (full seed), whereas in dry season, it was on R1-R4 (beginning bloom-full pod) and R5-R6 (beginning seed-full seed), respectively. In 1998, whitefly migration had a greater number than its immigration, on the contary, was occurred in 1999. The predators, ladybird beetle and spider were also trapped. Ladybird beetles were trapped mostly, by the yellow and light lemon yellow sticky traps, whereas a similar number of spiders was trapped by each type of sticky traps.
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