Spintbestrijding met moderne insecticiden in de Aalsmeerse bloementeelt

Some insecticides were tested in systematic trials or on a small scale, especially for ovicidal action, residual activity in relation to life cycle of red spider mite (Tetranychidae), herbicidal activity and method of application. Practical experience with them was gained with flowers under glass.

Azobenzene was a good acaricide and was also herbicidal but could in practice only be used on carnations. Parathion was satisfactory, except as a powder, if used repeatedly; resistance to it arose once just before the trial ended. Sodium selenate, a systemic insecticide, was efficacious for carnations; excess stunted growth. The selenate spray damaged roses. Soil treatment was satisfactory only in high doses. Pestox (bis(bisdimethylaminophosphonous anhydride)) had some effect on carnations and hortensias, and was transmitted through carnation plants. In practice an old remedy, spintspuit (mite spray), was effective but was laborious and raised risks from fungi. TEP (a tetraethyldiphosphate) was also tested.