摘要 : Results are presented of studies conducted to determine if the infestation levels of B. tabaci can be affected by the presence of yellow flowers during the growth of certain crops. These include (i) laboratory experiments establis... 展开 Results are presented of studies conducted to determine if the infestation levels of B. tabaci can be affected by the presence of yellow flowers during the growth of certain crops. These include (i) laboratory experiments established using flowering and deflowered plants of yellow Belgian mums (Chrysanthemum indicum) and sunflower; and (ii) greenhouse and field experiments to assay the impact of yellow flowers on the infestation of B. tabaci on some vegetable plants, i.e. summer squash (Cucurbita pepo) and cucumber. In the laboratory experiments, percentages of adult whiteflies found on flowering plants of Belgian mums (96%) and sunflower (80%) were significantly higher than percentages found on deflowered plants. In the greenhouse, although there was a trend for an increase in numbers of adults and eggs in the flower treatment, few significant differences were observed in either squash or cucumber. The only significant treatment effect in the greenhouse was observed for squash on the second day of exposure. In the field, the only significant treatment effect observed was for squash on the first day of count. Internal flower petals had higher values of colour characteristics than external petals. Colour values for the internal petal of the Belgian mums was generally higher compared with the internal petal of the cucumber, squash and sunflower. 收起