稻苗立枯病症之初步觀察

Abstract

本年（1971）第1期稻作在彰化縣花壇鄉為配合插秧機作業的育苗箱上所發生的稻苗立枯病症，其被害程度頗嚴重，探討其病原菌以及防治方法，所得結果摘要如下： 自枯死稻苗或尚未完全枯死稻苗分離所得菌類有：Sclerotium sp., Helminthosporium sp., Fusarium sp., Alternaria sp.及Monilia sp.等。又自被害稻苗根部或上壤中的菌核分離結果，皆可得Sclerotium sp.。 為防治該病症，應勵行稻種消毒，及育苗箱在播種復每箱灌注Tachigaren 1,000倍稀釋液500-1,000 ml，可得良好之防治效果。 In order to pair with the operation of rice transplanter. Seedling cultivation boxes are used at Hua-tan Hsiang of Chang-hua Hsien. In the first crop of this year (1971), the rice seedling disease severely occurred in seedling cultivation box. Concerning with the pathogen and controlling methods, the results are obtained as follows. The fungi isolated from dead tissues of the diseased seedlings or tissues not yet completely dead, were Sclerotium sp.; Helminthosporium sp.; Fusarium sp.; Alternaria sp.and Monilia sp.. On the other hand, there was same fungus Sclerotium sp. obtained from the roots of diseased seedlings and from sclerotia existed in the contaminated soil. For the control of seedling disease, seed disinfection and application of “Tachigaren” onto the seedling cultivation box at the rate of 500~1000 ml per box at 1:1000 dilution, might give good control.