Takagi, M. 1983c A preliminary release test of Aphytis yanonensis DeBach et Rosen (Hymenoptera; Aphelinidae), a parasitoid of Unaspis yanonensis (Kuwana).. Proceedings of the Association of Plant Protection (Kyushu) 29: 150-153.

Notes: In 1980 Aphytis yanonensis DeBach et Rosen was introduced from China into Japan to control the arrowhead scale (Unasis yanonensis). A preliminary release test was conducted in Fukuoka to determine the effectiveness of the parasitoid. In June 1982, 200 females were released in a grove containing 25 citrus trees. The percentage of parasitism gradually increased until it reached 67% in February 1983. The number of generations during this period was estimated to be about 8% based on the effective average temperature. The parasitoid which was found in October 1982 in a citrus grove about 15 m from the grove where it had been released could not be detected in February 1983 in a citrus grove about 600 m away.