Abstract

The use of insecticide emulsions in the pure form without diluting with water is a relatively recent concept in plant protection and this method of spraying has come to be known as ultra low volume application. This method of application has been practised for control of certain crop pests in countries like U. S. A. and Japan. The advantages of this system of dispensing the chemical are that large areas are covered in a short time, the load of water to be carried is eliminated, fewer tank loads of material are required and fewer aircrafts would suffice. The spray is rendered into droplets of size less than 100 and such small droplets are considered to be more effective than larger droplets discharged by low volume spraying. Toshiharu Uejima (1970) mentions that U. L. V. aerial spraying is the most required in the control of insect pests and diseases of rice for effective coverage of areas in a short time. Joyce et al. (1970) reports of large scale and successful spraying of paddy in Java wit phosphamidon 100% at the rate of 15,000 ha. per day.

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