Reproductive capacity of first-generation adults of the rice water weevil<Emphasis Type="Italic"> Lissorhoptrus oryzophilus</Emphasis> Kuschel (Coleoptera: Curculionidae) in Zhejiang,China |
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| Authors: | M?X?Jiang W?J?Zhang Email author" target="_blank">J?A?ChengEmail author |
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| Institution: | (1) Institute of Applied Entomology, Zhejiang University, 310029 Hangzhou, China |
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| Abstract: | First-generation adults of the rice water weevil, Lissorhoptrus oryzophilus Kuschel were collected from Yueqing (28.1°N latitude, 120.9°E longitude), Zhejiang, China, during late June and mid-July and reared on rice plants (cultivar Shanyou 63) in the laboratory (28±1 °C, 16L:8D) to examine their reproductive capacity. On plants aged 16–22 days, adults from the field and collected in mid-July could reach oviposition onset more rapidly and deposit more eggs than those collected earlier. Adults that emerged in late June and early July displayed a greater tendency to become reproductive, compared with those which emerged in mid-July. However, each of these groups of adults, either field-collected or newly emerged, deposited only 3–14 eggs within 60 days of feeding. Reproductive capacity was greatly related to plant age, with plants aged below 20 days being most favorable; on plants aged over 20 days, reproductive development could take place, but little oviposition was observed. These results indicate that the reproductive capacity of first-generation adults in Zhejiang is dependent upon the time of adult emergence and post-emergence, as well as on the age of rice plants. |
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| Keywords: | Lissorhoptrus oryzophilus Rice plants Reproductive capacity |
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