Studies of the Wet Dust and Mist-Dust Mixed Applicator (II)

Investigation of Chemicals Injury in the Field Tests

Abstract

As shown in previous report, our experiments clearly indicated that plant surfaces were covered very extensively by using the water-dust and mist-dust mixed application methods.
But in those experiments, we felt uneasy about effects of injury of applicated chemicals by the reason that covered surfaces were too extensive for plants.
So, the injuries of applicated chemicals for the Japanese pear, the cabbage and the yam were investigated in the field experiments. And the results of those were as follows;
(1) On the Japanese pear, when mixed chemicals of Bordeaux mixture and BHC dusts were applicated, those injuries were not occurred. But we found injury on the leaves only in the case of Folidol for the dusts.
(2) On the cabbage, injury of applicated chemicals was not found at all. And in the mist-dust mixed application plots the damages by insects and diseases were less than those in the water-dust mixed application plot.
(3) On the yam, injuries of applicated chemicals were not also occurred. The efficiencies of application work by mixed applicators were higher than those by power sprayers.
(4) It can generally be said that we need not care about chemicals injury in using the water-dust and mist-dust mixed application methods.
The working efficiency and pest control effects of these new application methods were good.