Inductive Effect of Attenuated Strains and its Inactivation Matter on the Resistance of Watermelon to Anthracnose

C3 and C5 in attenuated strains of melon anthracnose were screened from eighty-three strains.To succeed in inducing the resistance of C2 in virulent strains to anthracnose in watermelon,its living organism was inoculated and its inactivation matter was irrigated on the root respectively.And the result proved that its inactivation matter and living organism had the similar inducing ability.At the same time,the test got the persistent period of inducing resistance of C5's inactivation matter and the best plastochrone of inductive disposal.