Control of pests in welsh onion [Allium fistulosum] greenhouses by ultraviolet-blocking plastic film
2010
Ura, H., Fukuoka-ken. Agricultural Research Center, Chikushino (Japan) | Takemoto, H.
Stone leak leafminer, Lyriomyza chinensis (Kato) is the most serious pest of welsh onion greenhouses in Fukuoka prefecture. Effects of ultraviolet (UV)-blocking plastic film on L. chinensis were evaluated in two experiments. In Fukuoka agricultural research center, two small greenhouses (3.7 m x 8.5 m) were used. One greenhouse was covered with UV-blocking film and another was covered with non-UV blocking film. The number of damaged welsh onion was greatly reduced by using the UV-blocking film. In Asakura city, the most cultivated area, two big greenhouses (7 m x 43 m) were used during the period from June to December 2007. Welsh onions grown under the non-UV-blocking film were severely damaged by L. chinensis attacks. While, welsh onions grown under the UV-blocking film suffered few L. chinensis attacks during the test period. Other major pests, onion thrips, Thrips tabaci (Lindeman) and beet armyworm, Spodoptera exigua (Huebner) were controlled by combining insecticides with UV-blocking film. In welsh onion greenhouses with UV-blocking film the number of insecticide uses was greatly reduced. These results suggest that the use of UV-blocking film and insecticides is considered to effectively control pests in welsh onion greenhouses.
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