稻菌核性病害之研究(第二報)稻齡與發病、發病與產量之關係

Abstract

於網室內觀察稻各生育期對菌核性病害之感病狀況，均於稱生育後期之感病程度為高。但在溫室內稻之生育狀態或發病狀態等均與自然界有異，一般觀之，稻生育時期的變遷與罹病性很明顯，即稱生育初期之感病較多，但其後之病勢進展至上位葉鞘者，以生育後期之稱抽穗期或齊穗期為中心較為嚴重。 1. Under greenhouse condition, the susceptility of every growth stages of rice to scierotial diseases was investigated. The late stage was found to be more susceptible. But it was more or less varied field. Under field condition, the increase in number of diseased, plants was more rapid in early growth stage, while during the. booting and heading stages the upward development of the diseases was mare conspicuous.