オオワタコナカイガラムシ

Since 1954 the author has been engaged in the study of natural enemies of a mealybug, Phenacoccus pergandei Cockerell. The study was chiefly carried out at Fukuoka. In spring, 1958, the author made a survey trip to the northern part of Japan, i. e. to the prefectures of Fukushima and Aomori in Honshu and to Hokkaido. From April, 1960 to March, 1961, the author had a good fortune to stay at the Horticultural Division of Tohoku Agricultural Experiment Station at Fujisaki, Aomori Prefecture. In 1942 Rau decided that Phenacoccus pergandei Cockerell was a synonym of aceris (Signoret). The author sent specimens of this mealybug collected at Fukuoka to Dr. R. Takahashi for identification. In response he wrote to the author that the species of Japan would better be referred to pergandei, and that pergandei did not seem to be a synonym of aceris at the present time. The natural enemies of this mealybug discovered by the author include twelve species of parasites (eight being hyperparasites) and four species of predators as follows : 1. Pachynenron sp. (hyperparasite) 2. Unknown sp. A of Pteromalidae (hyperparasite) 3. Unknown sp. B of Pteromalidae ( h yperparasite) 4. Tetrastichus sp. (hyperparasite) 5. Achrysopophagus n agasakiensis(Ishii) (hyperparasite) 6. Anagyrus schonherri (Westwood) 7. Anagyrus sp. 8. Aphycus albicornis Timberlake Waterstonia fuliginosa Compere et Annecke, 1961, is a new synonym of this species and is the overwintering generation of Aphycus albicornis Timberlake as reported by the author (1960 and 1961). 9. Cheiloneurus sp. (hyperparasite) 10. Thysanus sp. (hyp erparasite) 11. Allotropa utilis Muesebeck 12. Lygocerus sp. (h yperparasite) 13. Leucopis (Leuco pomyia) silesiaca Egger (predator) 14. Scymnus (Nephus) phosphorus Lewis (pre dator) 15. Stethorus japonicus Kamiya (predator) 16. Hyperaspis japonica (Crotch) (predator)