Survival of Phytophthora infestans on potato haulms under field conditions in the state of Paraná, BrazilPotato (Solanum tuberosum) late blight caused by Phytophthora infestans is one of the most devastating foliar fungal diseases of the crop, and it is largely responsible for intensive fungicide spraying programs in southern region of Brazil. The pathogen is considered an "ecologically" obligate parasite in the northern hemisphere for its inability to survive in the absence of living plant tissue. This experiment was designed to evaluate how long a late blight lesion would remain active as a source of inoculum in Curitiba. Under the experimental conditions tested, the potato residues did not constitute a source of survival for P. infestans as an inoculum source for the subsequent potato crop in the southern region of the State of Paraná, Brazil.
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