Comparison of the efficiency of Rui Agro as new insecticides with Malathion and Hexaflumuron for control of Cereal leaf beetle Lema melanopa (Col .: Chrysomelidae) in field conditions

Cereal leaf beetle(Lema melanopa) is one of the most common pests of eastern Golestan province. Larvae often prefer the flag leaf for feeding, which has the greatest impact on the performance of wheat fields. One of the newest organic insecticides is Rui Agro (Matrin), so in this study the efficacy of Matrin at concentrations of one and two per thousand compared with Malathion and Hexaflumuron at concentrations of two per thousand and control treatment on larvae. This project was evaluated in a randomized complete block design with five treatments. Samples were taken one day before, 3, 5, 10 and 14 days after treatment and also in laboratory conditions the LC50 of Matrin on second and third instar larvae of this pest were estimated by using Polo-Pc software. The results showed that Matrine insecticide with high concentration had similar performance to Malathion and also in second concentration did not differ significantly affect with Hexaflumuron. Matrin LC50 level in second instar larvae were 57.57 ppm and for third instar larvae were calculated 106.79 ppm. Overall, the results indicate that the new insecticide Matrin ability to control this pest, as well as high-risk pesticides Malathion and can be an excellent substitute for it. Given that the origin of this insecticide from the extract of Russian knapweed, it has little effect on the environment.