No.205
Author:Feng-Chyi Lin1,7, Yi-Ju Chen2, Yi-Chung Chiu3, Jin-Zu Yu4, Jau-Yueh Wang5, Ching-Hua Kao6
Abstrct:
Integrated Pest Management (IPM) is based on monitoring techniques and economic threshold, combines various practices to suppress pest populations below the economic injury level (EIL). The key pests on vegetable and fruit crops which are in protected culture are too small to be controlled of their occurrence in time, such as whiteflies and thrips. If we could apply the effective integrated management, for instance, to release natural enemies or spread eco-friendly plant protection agents depend on densities of pests; it’s helpful to produce safety and good quality agricultural product. In the case of tomato in protected culture, silver whitefly (Bemisia argentifolii Bellows & Perring = Bemisia tabaci type B) was major pest which transmitted virus (genus Begonovirus) and caused serious injury on yield, quality, and product prices under improper control. Therefore, 30 yellow sticky traps can be used to monitor the whitefly diversity every week in crop facilities. It will be right time for pest control and use high-effective insecticides when whiteflies reach 50 adutls per trap. Act with the removal of diseased plants and mend of the insect screens simultaneously could keep the incidence of Tomato yellow leaf curl virus (TYLCV) below 10%. Natural enemies were released to substitute for chemical control when starting harvest two weeks ago. Test results showed that density of whitefly could lower than the EIL for 16 weeks without sooty mold by releasing parasitoid wasp, Orius flower bugs (Orius strigicollis (Poppius), lace bug and more than 70% of the pesticide were saved than the traditional practice. Another case results of sweet pepper showed that Orius flower bugs could well control the populations of Thrips palmi Karny and Frankliniella intonsa (Trybom) at 0.3/flower by releasing 5–6 Orius bugs on each plant weekly. Besides, lime sulfur powder and plant oil mixed could control broad mites and aphids to achieve the purpose of safe production without pesticides in the whole cultivation process.
Key words: Silver whitefly (Bemisia argentifolii Bellows & Perring), Tomato yellow leaf curl virus (TYLCV), thrips, Biological control, Integrated pest management.
1 Associate Researcher, Applied Zoology Division, TARI, Taichung, Taiwan, ROC.
2 Assistant Researcher, Applied Zoology Division, TARI, Taichung, Taiwan, ROC.
3 Assistant Entomologist, Applied Zoology Division, TARI, Taichung, Taiwan, ROC.
4 Associate Researcher, Applied Zoology Division, TARI, Taichung, Taiwan, ROC.
5 Assistant Researcher, Biotechnology Division, TARI, Taichung, Taiwan, ROC.
6 Researcher and Director of Applied Zoology Division, TARI, Taichung, Taiwan, ROC.
7 Corresponding author, e-mail: fclin@tari.gov.tw; Fax: 886-4-23317608.
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