抄録
There are three generations of Japanese mealybug, Planococcus kraunhiae (Kuwana), on persimmon each year. Chemical control of this bug is usually conducted in June and August when 1st instar nymphs appear which is the most susceptible to insecticides. However, the following additional countermeasures should be taken in heavily infested orchards: 1) eliminating overwintering nymphs by scraping away the tree bark, 2) spraying the tree with petroleum oil in winter and 3) applying pesticides from late April to early May when overwintering nymphs move to the top of shoots.
