Occurrence and epidemic dynamics of peanut web blotch disease in Liaoning Province.

Peanut web blotch disease(Phoma arachidicola Marasas) is one of the serious diseases in Liaoning peanut production and caused serious yield reduction by 30 %. To guild the control of disease in fileds, the peanut web blotch disease damage and epidemic dynamics of peanut web blotch were studied. A systematical investigation on the disease was carried out in 2011. The results showed that the percentage of this disease fields was 100%, the percentage of diseased leaf was 32. 9% to 66. 5%, the disease index was 11.1 to 35. 5. It occurred most seriously in Huludao, Fuxin and Jinzhou city, moderately in Shenyang and slightly in Tieling city. The order of disease severity among tested cultivars was Silihong > Baisha1016 > Huayu20 > Heihuasheng > Baihuasheng. Through comparing and analyzing, Logistic model could well refect the temporal dynamic of peanut web blotch disease. And the epidemic period could be deduced and the highest disease index increasing rate was 0. 99/d. The Silihong was highly susceptible and could be used for disease epidemic studying. [ABSTRACT FROM AUTHOR]