松枯梢病的研究

对我省松枯梢病的初步研究结果表明：松枯梢病是松色二孢菌侵染所致，其症状与有关报道基本相似，在我省分布24个县（市、区），为害21种松树．分生孢子一年有3个释放高峰，主要发病时间为4月初至11月中旬，有2～3个发病高峰期，病菌分生孢子产生释放、病害发生发展与温湿度、降雨量密切相关．种子不带菌，但从幼苗直至大树均可受病菌侵染．

Study on the Shoot Dieback Of Pines

The shoot dieback of pines in Fujian is caused by Diplodia pinea (Desm) Kickx, which can attack Pinus taeda,P. elliottii and other 19 species of the genus in this province,lts symptoms are basically similar to what reported before, but it can infect annual young cones to stop their developing and dieback. The pycnidia of the pathogen occur on the dead needles, sheathes, scaly-leaves, young shoots and seedling's stems.There are three abandant conidia releasing periods every year, infect respectively the spring shoots and thesummer shoots as well as overwintering buds. The disease develops mainly from April to the middle ten daysof November. Their conidia production and releasing, and the disease development have close relation to temperature, relative humidity and rainfall. The pathogen are not found on seed, but the fungi can infect pinesfrom the young seedlings to overgrown trees.