The status of insecticide resistance in adults of Bemisia tabaci (Gennadius) (Homoptera Aleyrodidae) populations collected on Poinsettia crops under greenhouse from two Italian regions was investigated by contact bioassays. Five insecticides (Deltamethrin, Diazinon, Dichlorvos, Endosulfan and Imidacloprid) were tested. LC-lines, LC50 and their confidential limits were computed by logit analysis. Resistance ratios (RR) were estimated at the LC50 level as RR = LC50 field population/LC50 susceptible population and ranged between 2.2 and 15.9. The results showed as insecticide resistance is still low but an underestimation of the problem (because of the large number of generations/year in Bemisia and the high selection pressure applied through the use of insecticides in greenhouses) could rapidly cause the failure of chemical control. The results suggest that efficient resistance monitoring for Bemisia and other key-pests of greenhouse is important for preventing or at least to delaying the onset of insecticide resistance. This can be achieved through a rational rotation of insecticides and a rational application of IPM strategies.
|Autori:||ROSSI E; MONACO G; CANALE A|
|Titolo:||Preliminary trials on insecticide susceptibility in Bemisia tabaci (Homoptera Aleyrodidae) populations collected on poinsettia (Euphorbia pulcherrima) in Italy|
|Anno del prodotto:||2007|
|Appare nelle tipologie:||1.1 Articolo in rivista|