Grape Vine Powdery mildew is caused by the fungus Uncinula necator. The fungus belongs to the genus of Ascomycotina. It is an obligate parasite, which means it needs green host tissue to feed. U. necator entered Europe in the nineteens century and it spread trough all wine growing countries up to the end of this century. It has very strong effects on yield and it can lead to defoliation of the vines if there is no chemical control. All European grape vine varieties are susceptible to this pathogen. The breeding on resistance against this pathogen is quite new and the results will take more years of work.
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