Introduction

 
In recent years, the combination of Amblyseius cucumeris, Orius laevigatus and Amblyseius degenerans was generally used to combat thrips. A. cucumeris was necessary to ensure a good complement of predatory mites in the crop as soon as cultivation commenced. In the summer, A. degenerans often takes over from A. cucumeris. The predatory bugs are necessary for the effective control of the adult thrips. Since chemical agents are sometimes ineffective in the initial stages of cultivation, thrips may already be present. Young crops are at a greater risk of thrips damage. The cotton whitefly Bemisia tabaci can cause fairly major problems, particularly in years with a warm summer. This white fly is difficult to combat with just chemical agents. With the aid of the parasitic wasps Eretmocerus eremicus and Eretmocerus mundus and the predatory bug Macrolophus caliginosus, the results are better although not optimum. In many cases, the predatory mite Amblyseius swirskii appears to offer an adequate solution for cotton whitefly.