The effects of adjuvant compounds (Bar-tar and D.G) on the efficiency of some common insecticides against 3rd instars larvae of the diamondback moth, Plutella xylostella (L.) (Lepidoptera Plutellidae)

The diamondback moth,(DBM) Plutella xylostella (L.) (Lep.: Plutellidae) is one of the most important pests of cruciferous plants throughout the world. In this research the efficiency of different common insecticides (Indoxacarb, Thiodicarb,Hexaflomoron) with or without adjuvants (Bar-Tar®, DG®) on the third instar larvae of DBM was investigated. Results showed that 50% lethal concentration (LC50) for Indoxacarb, Thiodicarb and Hexaflomoron on 3rd instars larvae with significant difference were 46.79, 543.12 and 6.22 ppm respectively. Also, the results showed that there were significant differences among different insecticides. between applied adjuvants,. Bar-tar had the higher percentage of usage dose in insecide reduction.