ECOLOGY AND POPULATION BIOLOGY Settling of Crawlers of Bemisia tabaci (Homoptera: Aleyrodidae) on Five Vegetable Hosts
نویسنده
چکیده
The nymphal stage of whiteßy pests is important in terms of its relationship to pest management measures and virus epidemiology. Among the nymphal forms, the active Þrst instar, i.e., crawler, is the only mobile form of immature whiteßies. A study was conducted to determine any inßuence of vegetable plant species and temperature on net distance moved (between the egg site and Þnal resting site) by crawlers of the B-biotype sweetpotato whiteßy, Bemisia tabaci (Gennadius). Testswere conducted in the greenhouse and under controlled laboratory conditions on Þve vegetable hosts: cantaloupe,CucumismeloL.; collard,Brassica oleracea ssp. acephaladeCondolle; cowpea,Vigna unguiculata (L.) Walpers; pepper, Capsicum annuum L.; and tomato, Lycopersicon esculentum Miller. The net distance moved was shortest on collard in which the crawler ceased traveling 2 mm from where it hatched. The crawler ceased traveling 10Ð15 mm from the site of hatching on the other vegetable host plants. Observations on collard in the laboratory indicate that the crawlers traveled 21 min during the Þrst stadium. No effect of constant temperature over the temperature range of 16Ð34 C was detected on the net travel distance of the crawlers. These data suggest that among the plant species in this study, collard is highly attractive for feeding and/or it offers suitable feeding sites that are easy to locate by the crawler. The results of this study help deÞne the behavior of crawlers on several host plants.
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