Evaluation of the Efficacy of thiacloprid (OD 24%) on Canola Pollen Beetle, Meligethes aeneus

Canola Pollen beetle Meligethes aeneus F. (Coleoptera: Nitudilidae) is an important pest of productive phase of oilseed rape Brassica napus in north of Iran (Mazandaran and Golestan provinces). Adults and their larvae feed on pollens and buds and hence causing damage. In order to introduce new insecticides for chemical control of this pest, this project was carried out in a RCBD with seven treatments and three replications in Mazandaran (Neka) and Golestan (Gonbad-e Kavous) in 2011. The treatments were Biscaya (Thiacloprid OD 24%), as a new insecticide with three doses (0.25, 0.3, 0.35 L/ha), diazinon EC60% (1.5 l/ha), Confidor (Imidacloprid SC 35%) (1 l/ha), phosalon (Zolone EC35%) (3 l/ha) and control (water spraying). Insecticide application was carried out when in average 7 beetles per plants were counted during green to yellow bud stage of the crop. Sampling and counting of the beetles were done 1 day before and 1, 3, 7, and 14 days after treatment by random selection of the main raceme of 10 plants from each plot. Data were analyzed with SAS software, the means were compared using Duncan and the pest mortality was calculated by Henderson-Tilton formula. The results show that the efficacy of the treatments level is significant differences between the treatments on the 1%. Mean comparison of efficacy percentage of the insecticides in Mazandaran and Golestan showed that Biscaya 0.350 l/ha with 78.11±2.01 and 84.36±1.72% efficacy, respectively, ranked as first group. Imidacloprid 1 l/ha, thiacloprid 0.300 l/ha, thiacloprid 0.250 l/ha, Diazinon 1.5 l/ha and Zolone 3 l/ha were grouped afterward, respectively.