Diapause termination,developmental threshold and thermal requirements of eggs of the maple aphid,<Emphasis Type="Italic">Periphyllus californiensis</Emphasis> Shinji |
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| Authors: | Chuan-Chan Wang Kimito Furuta |
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| Institution: | (1) Laboratory of Forest Zoology, Division of Agriculture and Agricultural Life Science, The University of Tokyo, Bunkyo-ku, 113-8657 Tokyo, Japan |
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| Abstract: | The lower developmental threshold and thermal requirements for egg hatch of the maple aphid (Periphyllus californiensis) were estimated to be 4.58°C and 94.48 degree-days. Eggs of the maple aphid appear to have obligatory diapause and chilling
seems essential for diapause development. No matter whether eggs in diapause were treated with 2°C chilling or placed in the
field, at least 35 to 41 days were required for the first egg to terminate diapause. The time of egg hatch lasted for about
a month or even longer. This long period of time in egg hatch may be related to the restricted period that food is available
in early spring and the long period of budburst of host plants. |
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| Keywords: | developmental threshold diapause egg hatch Periphyllus californiensis thermal requirements |
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