Comparitive insecticidal effect of chlorantraniliprole, spirotetramat, dimethoate and diazinon on vegetable leaf miner (Liriomyza sativae) under greenhouse condition

Document Type : Research Paper

Authors

Department of Plant Protection, University of Tabriz, Tabriz, Iran

Abstract

Vegetable leaf miner,Liriomyza sativae Blanchard (Diptera: Agromyzidae), is one of the most economically important pests of agricultural products, including vegetables and ornamentals. The larvae feed on leaf mesophyll and reduce photosynthesis and yield. Identifying more effective insecticides and choosing the suitable treatment method can be very important in managing this pest. In this study, the insecticidal effect of chlorantraniliprole, spirotetramat, dimethoate and diazinon were investigated on 1 st instar larvae of L. sativae. The study was conducted under greenhouse condition at 26 ± 2°C, 60 ± 10% RH and 16: 8 (L: D) h photoperiod. Preliminary experiments were performed to compare the insecticidal effects of leaf and root treatment of each insecticide. Leaf treatment was performed using leaf dipping method and soil treatment carried out by adding a certain amount of insecticide solution into the soil of each pot. Lethal concentrations were estimated for the treatments which caused higher mortality of the larvae. The results showed that only soil treatment of dimethoate (LC50: 53.73 mg ai L-1) was more effective than its leaf treatment (LC50: 162.91 mg ai L-1). The LC50 values for leaf treatment of chlorantraniliprole, spirotetramat and diazinon were 0.24, 6.11 and 53.72 mg ai L-1, respectively. Considering the results of the bioassays, treatment of plant leaves by chlorantraniliprole and spirotetramat, and treatment of plant soil by dimethoate are proposed as effective insecticides and suitable treatments to control this pest.

Keywords


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