Chaitophorus populialbae (Boyer de Fonscolombe) (Homoptera : Aphididae) is one of the important pest which attacks Euphratica poplar trees in Iraq. This study is conducted on poplar leaves aphids, C. populialbae In Shirqat district in Iraq during 2018 season. The study includes different leaf shapes of Populus euphratica such as (cordate, reniform, oval and ovate) Nymphs started to appear on Poplar leaves in the first two weeks of April and extendes till the end of November. The results indicate a fluctuation in population density during the mentioned period of time. The peak of population density (471 nymph) on the cordite shape is at the end of the third week of June. However, the least population density (27 nymph) on the reniform shape is recorded at the end of November. The activity period of nymphs may be affected by environmental conditions, especially temperature and relative humidity (RH). Among the different shapes of Poplar euphratica leaves had the highest infection that occurred when temperature and humidity are 33° and 24 % respectively. Toxicity of applied insecticides was investigated after 24 and 48 h in laboratory. Mortality (100%) was recorde by buprofezin a concentration of 0.001 after 48h followed by buprofezin with 93.33% mortality at 0.001 concentration after 24h of application. The study also showed that the least effective treatment was with abamectin (33.33% mortality) after 24h and 40% mortality after 48h at 0.025 concentration.
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