论文部分内容阅读
一、黄萎病莴苣黄萎病由类菌质体引起,由叶蝉类昆虫于苗床或本田初期传播,一般在定植后不久就发病,病株叶色变淡,心叶呈米黄色,幼苗期感染多出现顶端自枯症状,新芽生长完全停止,下叶黄化,出现米黄色坏死斑并迅速枯死。大苗染病多出现丛生症状,由顶芽腋芽长出很多丛生细叶。预防该病主要应防治叶蝉,可喷施2.5%功夫乳油2000～4000倍液。另外,苗床罩上防虫网,本田用白色或银色
First, verticillium wilt Verticillium wilt caused by the class of bacteria, by the leafhopper insects in the seedbed or Honda early spread, usually in the colonization soon after onset, the diseased leaves pale, the heart leaves were beige, seedlings More symptoms appear at the tip of autopsy symptoms, growth of new shoots completely stopped, yellow under the leaves, beige necrotic spots and died quickly. Larger disease appears more clusters of symptoms, buds axillary buds grow a lot of clusters of fine leaf. Prevention of the disease should mainly prevent leafhoppers, can spray 2.5% Kung Fu EC 2000 ~ 4000 times solution. In addition, seedbed cover insect net, Honda white or silver