Studies on the control of caterpillars of the Far Eastern urticating moth, Euproctis flava Bremer (I) : On aerial application of insecticide

Abstract

A trial for the control by means of aerial application of insecticide against caterpillars of the Far Eastern urticating moth, Euproctis flava Bremer, was made at the suburb of Nagoya-city. As the insecticide to be applied 3% γ-BHC dust was tested preliminarily in the laboratory. The BHC dusting by a helicopter Bell-47-G was applied over the habitat of the caterpillars by a ratio of 3kg of the dust to 10 are of the control area. In order to know the quantity of deposit and the spread of applied insecticide dust, and its correlation to toxic effect to pest, some experiments were carried out. For mesuring the deposit of insecticide dust the method of Hatai and Kimura (1954) using a scale has been introduced into this test. The toxic effect of the deposit to pest was evaluated using the caterpillars and adult of laboratry-reared house flies which were confined in a cage and placed at the aerial application field, along with a model test in laboratry. Through these experiments, it was confirmed that a practical value of the deposit and the spread of insecticide dust are obtainable by the condition of application and flight such as, flight-speed, flight-height, application-doses, etc., as shown in table 5. Such deposit was also proved to be effective against the test insects.