The mono-relationships between cotton-pests (aphid, Thrips, red spider mite, leaf hoppers, white fly, and cotton bollworms) in one hand and predators (lacewing, lady beetle and plant bug) on the other hand were studied to determine the interrelationship between each pair of pests and also between pests and predators. Four Governorate were chosen during two successive cotton-growing seasons (1999 &2000). The effect of each pest on the yield in the present or absent of other pests was studied. Results showed strong and negative relationship between sucking pests and the percentage of infestation with bollworms. The reduction in yields mainly due to the sucking pests (80-98 %). Strong and negative relationship occurred between the total number of sucking pests and the total number of predators, during the first stage of the plant growth.
Species 1: Hemiptera Aphididae Aphis gossypii (cotton aphid)
Species 2: Hemiptera Aleyrodidae Bemisia tabaci (whiteflies)
Species 3: Acarina Tetranychidae Tetranychus urticae (red spider mite)
Keywords: Cotton, Behaviour
The ESA 2001 Annual Meeting - 2001: An Entomological Odyssey of ESA