n African Entomology - Circadian rhythm and spatial distribution of mixed populations of two white fly species on cucumber in greenhouses

Volume 23, Issue 2
  • ISSN : 1021-3589



Whitefly (Homoptera: Aleyrodidae) is among the most important crop pests around the world. Recent work has focused on obtaining basic ecological information about white flies for the development of non-chemical techniques to control these insect pests. In this research, a series of experiments were designed to clarify the ecological characteristics of white flies in Hebei Province in northern China in 2012. Two white fly species, (Westwood) and (Gennadius) biotype Q, were investigated in the experimental greenhouses. The adults of these mixed whitefly populations displayed two activity peaks : one in the morning (09:00-11:00) and the other in the afternoon (15:00-16:00), with a tranquil period at night. The proportions of the two whiteflies at different leaf positions changed dramatically between the spring and autumn. The proportion of adults in the middle leaf position increased for both species in autumn compared to spring. The majority of moved downwards, whereas the moved upwards in autumn compared to their distributions in spring. The within-plant distribution of was more closely related to the leaf positions than leaf ages. In contrast, was more associated to leaf ages than leaf positions.

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