Abstract: 【Objective】Piemarker Abutilon theophrasti Medic as a trap plant in the integrated management of Bemisia tabaci (biotype B) in cotton and soybean crops was evaluated during 2004-2005 in Langfang, Hebei Province.【Method】Effects of piemarker as a trap plant were investigated through different planting dates, planting types and insecticide application on the piemarker plants. 【Result】Piemarker plants showed strong attraction to the whitefly adults, with significant differences among the treatments planted on different dates. The whiteflies were firstly found on the early planting piemarker with an attractive rate of 85.2% in early period of cotton/soybean growth, while the piemarker plants sowed in middle and late dates presented high efficiencies to the pest (93.3% and 95.4%) in middle and late season, respectively. There was a positive relationship between the uniformity degree of the piemarker distribution in field and attractive rate. The attractive efficiency from single interplanting piemarker was 3-fold and 7-fold high as compared to the planting types of the strip interplanting and plot interplanting. The insecticide application of 25% thiamethoxam WDG, 5% fipronnil SC, 25% buprofezin WP, 10% beta-cyperethrin LC, and 25% phoxim LC on piemarker plants, showed different control effects on sucking insect pests in cotton fields. The control efficiency ranged from 21.76% - 97.57% for the adult and 27.02% - 74.77% for the nymphs, respectively. Among the insecticides tested, 25% thiamethoxam WDG and 5% fipronnil SC gave best results in terms of maximum mortality of this pest in cotton and soybean crops.【Conclusion】Piemarker as a trap plant in cotton and soybean field can play an important role in the integrated management of B. tabaci.

Key words: B biotype Bemisia tabaci, piemarker, Trap plants, Integrated management