Annual Life Cycles of Two Populations of Eotetranychus tiliarium (HERMANN) (Acarina : Tetranychidae) on Different Alder Trees

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概要

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• The annual life cycle and diapause characteristics of Eotetranychus tiliarium (HERMANN) were studied in two Sapporo populations on alders (Alnus japonica and A. hirsuta). Over-wintered females appeared on leaves in early May (A. japonica population) and in late April or early May (A. hirsuta population), and were observed on leaves until early November and late October to early November on their respective hosts. It was estimated that there were probably 5 generations a year in both populations. In the A. hirsuta populations, all stages of mites were seen on leaves until the end of October, but this was not true in the A. japonica population. The photoperiodic responses of the two populations were similar and the proportion of diapausing females reached 100% at 13.5 hr of light or less at 18℃. The critical photoperiods in both populations were abotu 14.0 hr. Based on the diapausing status of those collected from the field, all the females of both populations should have entered diapause in October, and thus survival of all stages of the A. hirsuta population in late October seemed unexplainable. These discrepancies between stage structure and diapause response were discussed from the viewpoint of differences in the host plant trait at defoliation time and the mode of life of the mites. Some females of both populations, collected from bark crevices in early October, began to oviposit when incubated at 25℃ and 15L-9D. The number of days required for reactivation gradually decreased towards April, while the proportion of laying females, on the contrary, increased.

• 日本応用動物昆虫学会の論文
• 1988-08-25

著者

• Gotoh Tetsuo

  Institute Of Applied Zoology Faculty Of Agriculture Hokkaido University

• Gotoh Tetsuo

  Institute Of Applied Zoology Faculty Of Agriculture Hokkaido University:(present Address)laboratory

関連論文

• Annual Life Cycle of the Two-Spotted Spider Mite, Tetranychus urticae KOCH(Acarina : Tetranychidae), on Ribes rubrum L. in Sapporo : The Presence of Non-Diapausing Individuals
• Termination Pattern of Diapause in the Two-Spotted Spider Mite, Tetranychus urticae KOCH(Acarina : Tetranychidae)in Sapporo
• Life-History Parameters of Two Species of the Genus Eotetranychus (Acarine : Tetranychidae) on Deciduous Trees
• Life-History Parameters of the Hawthorn Spider Mite, Tetranychus viennensis ZA CHER(Acarina : Tetranychidae), on Deciduous Oak
• Comparison of Life-History Parameters of Two Forms of Panonychus akitanus EHARA(Acarina Tetranychidae)
• Life-History Parameters of Panonychus ulmi (KOCH)(Acarina : Tetranychidae) on Dwarf Bamboo
• Annual Life Cycles of Two Populations of Eotetranychus tiliarium (HERMANN) (Acarina : Tetranychidae) on Different Alder Trees
• Annual Life Cycle of the Spider Mite, Eotetranychus uncatus GARMAN (Acarina : Tetranychidae)
• Life-History Parameters of Three Species of Schizotetranychus on Deciduous Trees (Acarina : Tetranychidae)

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