Preliminary Studies on Phytophthora capsici in Pepper in Soil and Seeds

To probe into the occurring and developing regularities of Phytophthora capsici in pepper,we studied the transmission of Phytophthora capsici in pepper in soil and seeds in this paper.They can provide a basis for early detection and disease control.We mixed soil with Phytophthora capsici and injected sporangia to pepper fruit.We investigated the disease index of pepper plants grown in the soil and the living rate of pathogen in the soil.At the same time,our another aim was to confirm if seeds can be infected when the pepper fruits were inoculated with pathogen,and if the infected seeds can transmit the disease.Pepper plants grown in the soil were continued happen Phytophthora capsici at the growth period,and the disease incidence of pepper plants became steady in 105 days,meanwhile,Phytophthora capsici in the soil was still alive;we injected sporangia to pepper fruits,which can infect the seed and significantly reduced the germination and emergence rate and the seedling will sustainability happen Phytophthora capsici at the whole growth stage.The results showed that Phytophthora capsici in pepper was mainly transmitted by the soil and seed which naturally infected by pathogen.