44 ヤチダモを害するテントウノミハムシについて
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概要
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From 1949 to 1950,a great injury of the Chrysomilid-beetle, Argopistes biplagiatus MOTSCHULSKY, was found in the artificial Yachidamo (Fraxinus mandchurica PUPR.) windbreak forest at Mukawa County in Iburi Province, Hokkaido. This insects may injure Yachidamo trees in two ways ; First, directly by eating the leaf, and second, indirectly by disseminating plant disease. The result of observations and experiments on this beetle, have been reported in the present paper. 1) The writer minutely described the morphology and life history of this beetle, and also their relation to Yachidamo forest resources. 2) The insect passes the winter as an adult in the dry leaves on the ground. After emerging from hibernation in May the beetles feed for a time on the expanding leaves of Yachidamo trees, and the female copulates andlays their eggs on the undersides of the leaves in the end of May to early June. 3) The eggs hatch in about two weaks and the larva live in a very narrow space between the upper and lower epidermis of the leaf. Each larva makes a brown mine inside of the Yachidamo leaf, but a single leaf may contains many mines. 4) The injury of the larva is done between from the middle of June and the middle of July, and when the larvae are abundant they cause the foliage to become brown. The tree soon loon looks sickly and unattractive. Such infested tree is destroyed by Phomopsis canker of Yachidamo, Phomopsis sp. (Fungus). 5) In July the larvae become full-grown, they then pupate in the soil just below the surface. 6) In abouf two weaks the beetles emerge. From the end of July to the end of September the beetles feed but little and soon seek their hibernating quarters. 7) There is but one generation a year in Hokkaido. 8) The most effective artificial method of control is by spraying the trees with BHC solution. (250-300 times).
- 一般社団法人日本森林学会の論文
- 1951-07-25
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