棉作生育後期病害發生之調查及防治研究

Abstract

1. 五十六年度棉作生育後期病害之發生有黑化病要、炭疽病、角斑病、葉燒病、黑斑病、及紅腐病等葉部病害尤以黑斑病最嚴重，平均發生率達44.43%，棉鈴以黑化病最厲害，平均發病率達33.79%。 Difolatan > Copper sandoz > Polyram combi > Granosan M > Mercuric Bordeaux > Sin mercuric Bordeaux > Pan mercuic Bordeaux > Check。 Cotton is one of the important fiber crops of Taiwan, where the crop occupying about 2000 hectares. According to recent investigation, cotton plant is subject to a number of diseases in the later period of growth such as Diplodia boll rot, Alternaria leaf spot, Anthracnose, Fusarium boll rot, Angular leaf spot, and cercospora leaf spot, etc. Among them, cotton boll rot incited by Dipodia gossypina and Alternatia leaf spot incited by Alternaria. macrospora Zimm. are considered to be the most serious diseases of cotton boll and leaves. The average rate of cotton boll rot occurance in later period of Growth is 38.97% and Alternaria leaf spot is 44.43%.