甜瓜大斑病寄主及其抗病性研究

甜瓜大斑病菌可侵染黄瓜、西瓜、籽瓜、蕃瓜、苦瓜等7种瓜类作物。抗病性鉴定趋势表现为:白兰瓜系统抗病性较强,哈密瓜系统抗病性很弱。此病菌以菌丝体和分生孢子分别在病叶组织内外越冬。抑菌测定效果为:扑海因、羟锈宁、粉锈宁、杀毒矾、代森铵、代森锰锌抑菌率在95％以上,而双效灵、甲霜铜、农抗120抑菌率不及52％。

Studies on the Hosts of Muskmelon Big—spot and Thier Variety Resistance

Big-spot disease of the muskmelon (Alternaria peponicola)is a new disease and has been spreading in the areas of culturing muskmelon of Gansu province since 1983. It was reported that this disease infected melon for the first time in China. With artificial inoculation, the pathogen was able to infect Citrullus vulgaris, Cucubita pepo, Cucubita moschata, Cucumis sativus, Monodica charantia and Lagenaria vulgaris var. go. It overwintered in the diseased tissues in the forms of mycelia and conidia. The resistance of twenty three muskmelon varieties was identified, only Cinco and Hetaomelon were symptomless. Disease incidence of Canta and 35-10x was from 25% to 50%, but their severity of disease was below two grades and it showed that they were resistant. Kekeqi and 73-2 ete were highly susceptible. Identified results showed that resistance of the variety series of Bailan-mclon was stronger than that of Hami-melon. Nineteen fungicides were tested in inhibiting the pathogen and the inhibiting effect of Rovral, Banton, Banleton, Sandofan, Amobam and Maneozeb was over 95％.