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山核桃枝枯病观察与研究 被引量:8

0bservation and Research on Carya cathayensis Sarg
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摘要 山核桃枝枯病(Melanconium oblongum Berk.)始发于8月中下旬,盛发于10~11月。病菌侵染1年生枝梢和2年生侧枝,并向下蔓延引起大枝条枯死。发病初期症状不明显,后期枝梢顶芽干缩,枝条内部变褐坏死,死皮上产生小黑点即为病菌的分生孢子盘。分生孢子在25℃下发芽率最高,低于10℃不能发芽。在pH3~11范围内都能发芽。病菌以菌丝体和分生孢子在病枯枝上过冬。 Carya cathayensis Sarg. comes on in the second ten days and the last ten daysof August, and prevails between Oct.-Nov.. The germ makes inroads on annual branch andbiennial offshoot of the tree, then it creeps along and causes the trunk dead. There are noobvious symptoms on initial phase of the inroad, but upon lateral phase the terminal bud oninfected branch withers while the inside branch turns brown and then died. On bark of diedbranch, there occurs some black dots where acervuli of the germ are. With highest germinatedrate at 25℃, the conidiospore can not germinate under 10℃. In the scale of pH 3-11, the coni-diospore is able to germinate. The germ overwinters in its mecylium and conidiospore shapeon infected dead dranch.
出处 《浙江林业科技》 北大核心 1992年第1期18-22,共5页 Journal of Zhejiang Forestry Science and Technology
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