Analysis of the Main Inducing Factors of the Incidence of Sphaeropsis sapinea;

Pine shoot blight caused by Sphaeropsis sapinea is a kind of important disease in China.

eliottii), and on the resistence to Sphaeropsis sapinea of P.

The pine shoot blight(Sphaeropsis sapinea) in epidemic zones were divided into 3 types on the basis of investigation into disease damage and characteristics of 17 counties(cities) in the south of China which were light(no) epidemic zone,moderate epidemic zone and heavy epidemic zone.

Variation of Chlorothalonil Sensitivity within Sphaeropsis sapinea in China;

Through test on the seedling of pines indoor and outdoor,the antagonistic strain NA which had strong biocontrol effect against Sphaeropsis sapinea was obtained.

By the dural culture method on PDA plates with pathogens,16 bacteria isolates had strong antagonism against Sphaeropsis sapinea.

Through collecting,isolating and cultivating the pine phyllosphere microbes,several isolates were selected to test their antagonistic effect to Sphaeropsis sapinea and Pestalotiopsis sp.

Pine die back and brown spot needle blight disease(caused by Diplodia pinea and Lecanostica acicola) are two most destuctive diseases and impedes efficient management of Loblolly( Pinus taed L.