SPRAYING TRIALS AGAINST BLACK CURRANT GALL MITE.

This section focuses on the findings of spraying trials against black currant gall mite. The four chemicals found to be effective against black currant gall mite have been given further extensive tests. The chemicals in order of comparative effectiveness are endrin, fluoroacetamide, Thiodan and lime sulphur. Endrin has been shown to have no deleterious effects on colonies of hive bees which were deliberately exposed to sprays. Fluoroacetamide compared closely with endrin when applied at 0.05 or 0.1 percent after blossom but was in effective when applied before blossom. Thiodan gave inferior results to fluoroacetamide when compared as a post blossom spray at 0.05 percent but was more effective than lime sulphur when used at that time.