Abstract
1. A survey on the increase of Ruby scale, Ceroplastes rubens MASKELL and the effect of insecticide applications on the activity of Anicetus benefictus ISHII et YASUMMATSU, an effective parasite of the scale, was conducted in selected citrus groves of Kyushu in 1963.2. The survey revealed that the parasite showed a low activity in citrus groves, where Parathion had been applied for the past 4 or 5 years. The insecticides sprayed on citrus groves in 1962 and 1963 had more detrimental effects upon the parasite than on other types of trees.3. A. beneficus, specifically playing important part in controlling Ruby scale, was destroyed by the program of spray application which contributed toward increasing the prevalence of the scale.
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