This disease (also Eutypa lata, wood rot, dead-poor disease, dead-poor disease) has long been known in the apricot. Only in the early 1970s was it observed in Australia that it also occurs in the vine. It is distributed worldwide, especially affecting older vines. In particular, it occurs in a Mediterranean climate (Australia, California, southern France, South Africa). The infection is usually after a rain of fresh pruning wounds, in these places dead wood zones. In the wood, dark brown discolored, very hard wooden bodies emerge, which are sharply demarcated from healthy wood. The first symptoms are similar to those of lack of nutrients (such as the chlorosis ) occur.
The leaves are pale yellow discolored and later necrosis on. With the notes it comes to strong Verrieseln, Growth then decreases more and more from year to year. The leaves are getting smaller and the shoots are getting shorter and it comes to broom growth. In heavy infestation, the grape formation is omitted. Within three to four years, the vines die in the summer or there is no more exudation in the spring. Responsible is the wood-destroying fungus Eutypa lata, which parasitizes in the wood body. It excretes toxins that are transported with the flow of water throughout the plant. The best and safest measure, the vines against eutypiose (and also the similar running wood disease Esca ) is to prevent the wood-destroying fungi from entering the wooden body. If the vine has already been infested, however, there is hardly an effective antidote. See also below mushrooms and Vine enemies,
Images: INRA Science & Impact - Photo P. Lecomte