カンキツ樹におけるアブラムシ類の越冬

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Overwintering eggs of aphids on citrus trees were studied over two winter seasons from 1976 to 1978. Three aphid species, namely the black citrus aphid Toxoptera citricidus (KIRKALDY), the green citrus aphid Aphis citricola VAN DER GOOT, and the cotton aphid Aphis gossypii GLOVER, oviposited on citrus trees in late fall. Overwintering of the last species was ascertained in the present study. Many eggs of the green citrus aphid and the cotton aphid, but few eggs of the black citrus aphid were found on citrus trees. The overwintered eggs of the green citrus aphid and the cotton aphid hatched in the next spring while the hatched larvae settled on the sprouting buds and the fundatricis produced the second generation to increase exponentially until many alate emigrants were produced. The black citrus aphid settled on the buds and developed to adult fundatrices, but produced no second generation. The distribution of overwintering eggs per tree in the green citrus aphid and the cotton aphid were different. Larval hatching rates of the overwintered eggs were almost the same among the three species. But survival rates of larvae from hatching to settling on the buds and from settling to emergence were different in the three species, especially in the black citrus aphid these rates were very low. In the green citrus aphid, alate viviparae from overwintered eggs on citrus trees appeared earlier than those which had migrated from other host plants outside the citrus grove. In contrast with the cotton aphid, the immigration of alate viviparae from other host plants occurred earlier than the appearance of those from overwintered eggs on citrus trees. The overwintered eggs of the green citrus aphid on citrus trees may play a major role in the spring infestation of citrus trees unlike those of the cotton aphid.
日本応用動物昆虫学会の論文
1979-11-25

カンキツ樹におけるアブラムシ類の越冬

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