Serious Incidence of the Rice Gall Midge in the Central Plain of Thailand

概要

論文の詳細を見る
In June 1977,the rice gall midge, Orseolia oryzae (WOOD-MASON), seriously attacked the second crop of rice in Bangkhanag village, Bangnampriew district, Chachengsao province near Bangkok. Such an insect outbreak has not been previously recorded in the central ricegrowing areas of Thailand. The high yielding RD hybrid was directly sown in 480 ha between February and April. The percentage of damaged tillers and hills was 48.3 and 95.3,respectively, and the number of galls per hills was 3.3,ranging from 1 to 11 galls, During May and June, adult emergence reached more than 70% of the galls collected, but less larvae and pupae were found in the galls. The parasite, Neanastathus grallarius, was dominant, parasitism reaching 11 to 35%. Insecticidal application by the farmers using Furadan 3% G and Monocrotophos 50% EC was ineffective because of its late application. The severe outbreak can be considered as follows, a) the village is adjacent to Prachinburi province where the insect has occurred at a low level, b) a highly susceptible variety was widely planted at a high density by direct sowing, c) a large amount of fertilizer was applied, d) a suitable environment for reproduction of the gall midge was provided by the irrigation throughout the year, and e) wild rice, which is the most important host plant of the rice gall midge, was in evidence in the area.
日本応用動物昆虫学会の論文
1978-11-25