To Study the Efficacy of Different Concentrations of cyromazin (WP 75%) against Liriomyza trifolii (Burgess) in Comparison with abamectin (EC 1.8%) and acetamiprid (SP 20%) in Greenhouse Cucumber

Serpentine leafminer, Liriomyza trifolii (Burgess) is one of the most important pests of vegetables, especially on cucurbit in greenhouses. A study was conducted to determine the efficacy of some insecticides including acetamiprid (Mospilan® SP 20%) at the rate of 750 g/ha, abamectin (Vertimec® EC 1.8%) at the rate of 600 ml/ha and cyromazin (Trigard® WP75%) at the rates of 100 and 200 g/ha in the first year of the studies and at the rates of 200, 300 and 400 g/ha in the second year of the studies on L. trifolii. All the experiments were conducted in a completely randomized block design with 4 replicates. In the first year 3 days after applying the insecticides abamectin and cyromazin (200 g/ha) showed 78.37% and 75.21% mortality, respectively while acetamiprid showed 11.30% mortality which is the lowest effect against the pest larvae. In the second year of the experiments after two times of sampling (8 and 12 days after spraying), abamectin showed 100% and 94.32% mortality and cyromazin (200 g/ha) with 99.64%and 98.14% mortality, cyromazin (300g/ha) with 97.27% and 99.22% and cyromazin (400g/ha) with 98.90% and 100% mortality were the most effective insecticides, while acetamiprid with 20.96% and 37.81% mortality, did not show considerable efficacy.