【摘要】 在大棚番茄上喷施蓖麻叶片粗提物,每8行喷6行留2行不喷作避难所,或在避难所上再喷苘麻叶片粗提物,观察番茄上烟粉虱成虫和卵的数量变化。结果表明:喷施蓖麻叶片粗提物后,番茄上烟粉虱成虫和卵的种群数量显著下降,成虫和卵的虫口减退率于处理后第2天达最大值,第3天开始下降;在避难所上增施苘麻叶片粗提物,经蓖麻叶片粗提物处理的番茄上烟粉虱成虫和卵的虫口减退率明显提高,且证实每6行处理设置2行避难所,可获得较好的驱避效果。根据上述分析,蓖麻叶片粗提物对大棚番茄烟粉虱具有一定的驱避作用,其有效作用时间为2～3 d。更多还原

【Abstract】 The leaf extract of castor plants and abutilon plants were sprayed onto tomato plants grown in greenhouse to study the efficacy of these leaf extracts on Bemisia tabaci.Two treatments were set up in this study,including 8 lines of tomato plants for each treatment.In first treatment,the leaf extract of castor plants was sprayed onto 6 continuous lines of tomato plants,and the rest 2 lines of plants were used as the refuges for B.tabaci.For the second treatment,the leaf extract of castor plants was sprayed onto 6 lines of tomato plants,and the rest 2 lines were sprayed with the abutilon extract.The application of the leaf extract of castor plants significantly decreased the population of the adults and eggs of B.tabaci.The decline rates of the adults and eggs of B.tabaci reached their peaks on the 2nd day after the treatment,and began to decrease on the 3rd day.The application of the leaf extract abutilon plants significantly increased the decline rates of the adults and eggs of B.tabaci.Compared with non-abutilon leaf extract treatment,better efficacy was observed when 6 lines of tomato plants were sprayed with the extracts of castor plants,and 2 lines were treated with abutilon extracts.Our results indicated that the leaf extract of castor plants produced significant repelling effects on B.tabaci on greenhouse tomato plants.更多还原