Survey and population density of some dominant homopterous insects attacking soybean plants
2011
Abd El-Samed, A.A. | Al-Habshy, A.Z.N. | Ahmed, M.A.
The aforementioned insect pests were collected by the two methods from soybean plants. The plant samples and sweep net were used. The obtained results showed that the visual examination proved to be the best method to collect all the aphid species, thrips and whitefly insects. The date showed that the sweep net proved to be the best method to collect all the leafhopper species. The seasonal population abundance of Aphis gossypii (Glover) on soybean plants showed one peak was recorded at the 3rd week of August for the two seasons. The leafhopper species Empoasca decipiens (Paoli) and Empoasca decedens (Paoli) were the most abundant species on soybean plants. Two peaks were recorded for E. decipiens and E. decedens. The first peak occurred at 2nd week of July for E. decipiens, while the first peak of E. decedens was noticed at 4th week of July for the two seasons, respectively. The second peak was recorded in 2nd week of August for E. decipiens, while E. decedens attained its second peak in 3rd week of August for the two seasons of study respectively. One peak was found for Thrips tabaci (Lind.) during the 4th week of June for the first season. While occurred in the first week of July during the second season. The whitefly species Bemisia tabaci (Genn.) was the most abundant species on soybean plants, two peaks density were recorded for this insect. The first one occurred in the first of July for the adult stage. The second peak was recorded in 2nd week of August for the same stage. While the first one occurred at 4th week of June for immature stage, and the second peak was recorded in the first week of August during the two seasons, respectively
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