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Pepper Phytophthora blight caused by Phytophthora capsici L. is the most destructive disease for reducing pepperyields in the world. Building up varietal resistance and induced resistance to the disease are of agricultural importance. Inthis paper, the disease resistance induced by salicylic acid (SA) against P. capsici were studied by using four hot pepperlines with different resistant abilities and one P. capsici strain with middle pathogenicity. Results show that SA couldinduce significantly the resistance of pepper seedlings to P. capsici, but CaCl2, KH2PO4 and VAM couldnt. SA at arelative low concentration from 0.15 to 0.3 g L-1 had no antifungal activity in vitro against P. capsici. That means thedisease resistant enhancement of the plants treated with SA is due to the induction effect, but not the antifungal effect ofSA. About 1 to 5 days internal between SA-treatment and challenge inoculation was sufficient to induce the diseaseresistance of hot pepper. The resistance could remain more than 20 days after treatment with SA.
Pepper Phytophthora blight caused by Phytophthora capsici L. is the most destructive disease for reducing pepperyields in the world. Building up varietal resistance and induced resistance to the disease are of agricultural importance. Inthis paper, the disease resistance induced by salicylic acid (SA) against P. capsici were studied by using four hot pepperlines with different resistant abilities and one P. capsici strain with middle pathogenicity. Results show that SA couldinduce significantly the resistance of pepper seedlings to P. capsici, but CaCl2, KH2PO4 and VAM couldnt. SA at arelative low concentration from 0.15 to 0.3 g L-1 had no antifungal activity in vitro against P. capsici. That means the disease resistant enhancement of the plants treated with SA is due to the induction effect, but not the antifungal effect of SA. About 1 to 5 days internal between SA-treatment and challenge inoculation was sufficient to induce the diseaseresistance of hot pepper. The resistance could re main more than 20 days after treatment with SA.