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- 저자 : Su Ping Ong (검색결과 2 건)
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Su Ping Ong,Dennis J. O’Dowd,Peter T. Green 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.2
Development and reproduction of the hymenopteran parasitoid Tachardiaephagus somervilli Mahdihassan (Chalcidoidea: Encyrtidae) were studied in its native range in Malaysia as part of a classical biological control program on Christmas Island (Indian Ocean). Tachardiaephagus somervilli was reared in the laboratory on its target host, the yellow lac scale, Tachardina aurantiaca Cockerell (Coccoidea: Kerriidae). The developmental time, survival, and sex ratio of F1 offspring from two different sources of F0 adults (field-collected F0 adults [=‘wild-caught’] and F0 adults that emerged from parasitized hosts in the laboratory [=‘laboratory-emerged’]) were compared. Sources of F0 adults did not affect the developmental time of either male or female offspring, which ranged from 23 to 25 days. Furthermore, per capita fecundity of laboratory-emerged F0 females was three times greater than wild-caught F0 females. The number of emerged F1 adults was positively related to host size. Tachardiaephagus somervilli has a short generation time relative to its female Tachardina hosts (~23 vs ~90 days), high fecundity (~16 emerged offspring per laboratory-emerged female) and can potentially complete 12–15 generations per year. This rearing protocol produced sufficient quantities of adult T. somervilli for the export and successful introduction to Christmas Island (Indian Ocean) for the biological control of invasive T. aurantiaca, with near 100% survival rates for both sexes during transit.
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Juvenile hormone regulation on the flight capability of Bactrocera dorsalis (Diptera: Tephritidae)
Chen Peng,Chen Min,Ye Hui,Yuan Ruiling,Du Chunhua,Ong Su Ping 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.4
The oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae), is considered a major economic threat in many regions worldwide. In order to better understand the flight capacity of B. dorsalis and its physiological basis, the functions and regulatory roles of juvenile hormone (JH) in the flight muscle of B. dorsalis were studied under a controlled environment. JH titer of B. dorsalis varied with age and sex. Females have higher JH titers and better flight capabilities than males, given that the increase in JH also corresponded to the ovarian development and maturation in females. The flight duration and distance of both males and females increased with the gradual increase of JH titer after adult emergences. Both JH titer and flight capability peaked in 15-d-old adult and declined subsequently with age. Flight activity stimulated the production of JH as adults flown for 24 h on the flight mills have the highest JH titers compare to adults flown on shorter flight durations. Adults treated with 0.5 µg and 5 µg of JH III were able to fly long durations and long distances, nevertheless when JH titer was too low or too high, it would restrict the flight ability of the fly. The mutual reinforcement of JH and flight activity provides fundamental understanding on the physiological aspects of the flight capability and dispersal, which facilitates strategies for the long-term control of this destructive pest.
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