Changes in susceptibility to insecticides of selected strains of Spodoptera littoralis (Bosid) subjected to selection pressure with diflubenzuron for one generation [Egypt]
1988
Guirguis, M.W. (Zagazig Univ. (Egypt). Faculty of Agriculture) | Watson, W.M. | El-Hamaky, A.M.
The present study aimed to investigate the development of resistance and cross resistance pattern in Spodoptera littoralis (Boisd.) larvae to different insecticides. Summarized results show the following:- The descending order of toxicity of the test toxicants to Parent larvae was diflubenzuron, fenvalerate, methomyl and profenofos. - The susceptibility of the selected strains to the selecting agents was decreased till reached the highest level in F4 selected generation. - The cross tolerance pattern in F selected generation revealed that diflubenzuron-selected strain exhibited low cross-tolerance to methomyl, profenofos and fenvalerate (TR = 2.33, 2.63 and 3.5 fold, respectively). Methomyl-profenofos-and fenvalerate-selected strains exhibited high level of tolerance to the selecting agent and high level of cross-tolerance to the other two test toxicants.- When methomyl-, profenfos- and fenvalerate-selected strains subjected to selection pressure with diflubenzuron for one generation, the cross tolerance of the four tested toxicants was clearly decreased.
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