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Chitosan inhibited growth of Botrytis cinerea in liquid culture and suppressed grey mould on detached grapevine leaves and bunch rot in commercial winegrapes. Germination of B. cinerea was completely inhibited in malt extract broth containing chitosan at concentrations greater than 0·125 g L−1. However, treated conidia were able to infect detached Chardonnay leaves and pathogenicity was not affected,...
Thirteen tomato (Solanum lycopersicum) accessions were tested for inducibility of resistance against two isolates of Phytophthora infestans using BABA (dl‐3‐amino butyric acid) as the inducing agent. In a more detailed trial, six of the accessions were assessed for inducibility of resistance to six P. infestans isolates on three leaves of different age per plant. Plants were inoculated 1 week after...
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