新白塗剤による柑橘のゴマダラカミキリの産卵防止

概要

論文の詳細を見る
Methods of protecting citrus from laying eggs of white-spotted longicorn, Anoplophora malasiaca THOMSON, were studied using poly vinyl alcohol and poly vinyl acetate which form an insoluble membrane after evaporation of water. 1. The membrane set with technical products of DDT and BHC and the same quantity of poly vinyl alcohol (1500) remained for six months, but, the efficacy of preventing laying eggs was imperfect on the 12th day after application, accordingly it was difficult to completely prevent the laying eggs in this way. 2. The white wash in which slaked lime was set with poly vinyl acetate containing 2.5 per cent of slaked lime by weight, caused high rate of falling off of membrane, so, its efficacy proved unavailing on the 21st day after application. 3. The white wash in which slaked lime was set with poly vinyl alcohol (2000) containing 5 per cent of slaked lime by weight, was lower than the former at the rate of falling off, but its efficacy was incomplete on the 31st day after application. 4. The new white wash in which slaked lime was set with poly vinyl alcohol (2000) containing 5 per cent of slaked lime by weight and poly vinyl acetate containing 2.5 per cent of slaked lime by weight, was very low at the rate of falling off and its efficacy in controling laying eggs was almost perfect for the whole duration. 5. It was useless to add insecticides to this white wash. 6. The rate of falling off, six months after the application, was less than 7. 8 per cent and the hardness measured by a rubber hardness meter was more than 732.1 g in the new white wash to control laying eggs completely. This expected value was obtained by slaked lime of good quality mixed with poly vinyl alcohol (2000) and poly vinyl acetate containing 5 per cent each by the weight of slaked lime. 7. From the beginning to the middle of June, just before laying eggs, is suitable time to apply this new white wash, but eggs which have already been laid should be shaved off. 8. Though eggs are laid more frequently on aged trees than on younger trees, it is not practical to neglect, protecting the younger trees from laying eggs, and so the protection methods concerning younger trees were also studied. 9. It is desirable to extend the range of application even to twigs which are not seriously damaged by insects even if eggs are laid on them, but application should be recommended in accordance with the size and the form of trees as follows : treat to 1 m above the ground surface at low-trimmed trees and 20 cm above a fork of bough or main trunk at high-trimmed trees, or it should be limited to the height where eggs can be easily found, and inspection must be made at frequent intevals to determine whether or not eggs are laid on the border of a treated bough or trunk.
日本応用動物昆虫学会の論文
1957-12-01

新白塗剤による柑橘のゴマダラカミキリの産卵防止

スポンサーリンク

概要

著者

関連論文

スポンサーリンク