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http://dx.doi.org/10.5656/KSAE.2010.49.2.115

Effect of Day Length and Temperature on the Diapause Termination of Riptortus pedestris (Hemiptera: Alydidae) Female Adults  

Huh, Wan (Division of Applied Life Science (BK21 Program), Institute of Agriculture and Life Sciences Graduate School of Gyeongsang National University)
Son, Dae-Young (Division of Applied Life Science (BK21 Program), Institute of Agriculture and Life Sciences Graduate School of Gyeongsang National University)
Park, Chung-Gyoo (Division of Applied Life Science (BK21 Program), Institute of Agriculture and Life Sciences Graduate School of Gyeongsang National University)
Publication Information
Korean journal of applied entomology / v.49, no.2, 2010 , pp. 115-121 More about this Journal
Abstract
The bean bug, Riptortus clavatus Thunberg (Hemiptera: Alydidae), is a pest of soybeans and tree fruits. It enters reproductive diapause during winter. We studied the effect of different combinations of temperature, day length, and treatment period on the termination of diapause in R. clavatus using adult females collected in October and November 2006. Ovarian development was used to determine diapause termination. The treatments were: (1) HTLD; $25^{\circ}C$, 14L:10D treatment for 1, 2, 3 weeks and 30 days, (2) HTSD; $25^{\circ}C$, 10L:14D treatment for 1, 2, and 3 weeks, (3) LTLD; $8^{\circ}C$, 14L:10D treatment for 1, 2, and 3 weeks followed by HTLD for 3 weeks, and (4) LTSD; $8^{\circ}C$, 10L:14D treatment for 1, 2, and 3 weeks followed by HTLD for 3 weeks. The HTSD treatments did not affect ovarian development, and resulted in no significant difference in the number of mature eggs in ovaries or the percentage of diapause-terminated females compared to the control females before treatment. The percentage of females that terminated diapause was significantly higher in the HTLD treatment than in the HTSD treatment. The HTLD treatment for more than 14 days increased the percentage of diapause-terminated females, accelerated the development of the ovaries, and increased the number of mature eggs in ovaries. Compared with the HTLD or HTSD treatments, the LTLD or LTSD treatments followed by the HTLD treatment accelerated ovarian development and increased the number of ovipositing females. The pre-LTSD treatment for 1 week was enough to increase the number of eggs oviposited.
Keywords
Soybean; Reproductive diapause; Over-wintering; Ovarian development;
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Times Cited By KSCI : 2  (Citation Analysis)
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