Abstract: In order to explore the new way of high precision application on cucumber （Cucumis sativus Linn.） plant, and screen efficient systemic insecticides against Aphis gossypii Glover, the corrected fatality rate and the instantaneous rate of population increase （r_i） of nine insecticides against A. gossypii Glover were evaluated by stem application. The results showed that the corrected fatality rate of acetamiprid 20% soluble concentrate and flonicamid 10% grain agent were significantly higher than the other insecticides. The corrected fatality rate of these two insecticides were nearly 100.0% on the tenth day and fifteenth day, and were still above 95% until twenty days after application. Flonicamid 10% grain agent had poor efficiency, but better persistance. The maximum mortalities of imidacloprid 70% grain agent and nitenpyram 10% aqueous solution were 99.3% and 95.0% on the tenth day, respectively, and were all above 90% until twenty days after application. The maximum corrected fatality rate of thiamethoxam 25% grain agent, cyantraniliprole 10% suspension concentrate, pymetrozine 25% wettable powder, dinetofuran 20% grain agent and spirotetramat 22.4% suspension concentrate were all below 90%. Under the treatment of medium and high concentration, acetamiprid 20% soluble concentrate and imidacloprid 70% grain agent had significant stage inhibiting effects on the population increase in the middle of the trail, whereas flonicamid 10% grain agent showed constant inhibition in the later stage. Acetamiprid, imidacloprid and flonicamid had higher systemic activity to A. gossypii Glover in cucumber plant.

Key words: Aphis gossypii Glover, systemic insecticide, cucumber （Cucumis sativus Linn.）, stem medication, fatality rate, instantaneous rate of population increase