Studies on the bark treatment for fruit trees with methyl demeton

Abstract

In this paper some problems concerning the painting, one of the bark treatments, with P=O Metasystox (25%) on fruit trees are discussed. A special attention is paid to the dosage of the insecticide and the bark injury caused by the treatment. The important content of the paper is summarized as follows. 1. The necessary dosage to be given to a branch must be determined according to the volume of the branch. The dosage is considered as 1cc per 1500~3000cm3 for aphid control, but is 1cc per 1500~2000cm3 against red spider mites. 2. A simple, practical measure of painting, in which the available dosage mentioned above is concerned, is suggested in order to facilitate the treatment. It is the light painting on branch bark (ca 0.6 cc/100cm2) in the area of 3~4 times length of branch diameter. 3. The bark injury may be prevented even on citrus trees by keeping away from the two factors such as high temperature and thick painting (more than 0.6cc per 100cm2). The safe and dangerous ranges of phytotoxicity on citrus trees are given in the Figure 4. © 1964, JAPANESE SOCIETY OF APPLIED ENTOMOLOGY AND ZOOLOGY. All rights reserved.