مقايسه تاثير برخي حشره كش هاي شيميايي و بيولوژيك در كنترل سوسك كلرادوي سيب زميني LEPTINOTARSA DECE MLINEATA )SAY()COL:CHRYSOMELIAE( در مزارع سيب زميني مياندوآب

Comparative Efficacy of Chemical and Biological Insecticides for Control of Colorado Potato Beetle, Leptinotarsa decemlineata (Say), in Potato Fields

In order to select a suitable insecticide to control Colorado Potato Beetle, Leptinotarsa decemlineata. five biological, plant origin and chemical insecticides were compared. Treatments were Fosalon 35% (2 lit/h), Neemplus (2.5 lit/It), Custom BC-3 (1 lit/h), Jack Pot BFC (5 lit/h), B.t.Col (2 kg/h) and the control. The experiment was conducted in a randomized complete block design (RCBD) with five replicates for two years (1999-2000). Spraying was done during early larval stages of the pest. One day prior to insecticide application and three, five and seven days after that, number of survivors were counted. Results showed a significant difference among insecticides regarding mortality rate of larvae. Fosalon was significantly more effective compound by having 88.19% mortality, followed by Jac pot BFC and Custom BC 3 by 62.46, and 60.63% mortality rates, respectively. Neemplus by causing 41.07% was determined to be a less effective insecticide which was significantly different from all but B.t.Col. which caused 52.13% mortlity.