A major finding has been the deficiencies in an existing insecticide resistance management strategy which recommended a continuous rotation of four chemical groups throughout the year. The strategy further recommends removing the ineffective organochlorine and carbamate inseticide groups from the rotation, pointed up problem insecticides within the two remaining insecticide groups e.g prothiotos, stressed the need to include alternate insecticide groups with different modes of action within the rotation viz. Bacillus thuringiensis kurstaki, and supported the benefits of a break in crop production in summer allowing ecological factors to influence pest numbers.