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对樟子松枯梢病、健组织病菌的分离、孢子萌发和接种试验等研究结果表明,樟子松枯梢病是一种寄主主导性病害。引起该病的松壳色二孢[Diplodia pinea（Dem.）Kickx]可在历年病树上的针叶、芽、梢、枝和果鳞上越冬,又可在健康树上的针叶、芽、梢、枝和果鳞上潜伏侵染。其潜伏侵染带菌率:健康樟子松越冬各部位比当年生各部位潜伏带菌率高,分别为20％～70％和6％～30％,其中以针叶、梢、枝和每年4,5月份、9,10月份潜伏带菌率最高。病害的初次侵染源主要来自历年病树上病菌子实体飞散出来的分生孢子,借风和雨水淋洗传播,种子上不带菌。病菌可直接侵入当年嫩梢和嫩针叶,也可通过伤口、气孔侵入针叶、芽、梢和枝。潜伏期7～14d,繁殖期23～28d。
The results showed that Pinus sylvestris var. Mongolica is a host-dominant disease on the shoot-tip blight of Pinus sylvestris var. Mongolica, separation of healthy tissue bacteria, spore germination and inoculation test. Diplodia pinea (Dem.) Kickx, which causes the disease, can winters over conifers, buds, shoots, branches and fruit scales in diseased trees over the years, but also conifers and buds of healthy trees , Shoots, branches and fruit scales lurking infection. The infection rate of latent infection: all parts of healthy Pinus sylvestris overwinter than the current annual growth rate of various parts of the high, respectively, 20% to 70% and 6% to 30%, of which needle, shoots, branches and annual 4, May, 9, October, the highest incubation rate. The primary source of disease is the conidia splashed by the diseased phytopathogenic fungi over the years, rinsed by the wind and rain, and laden with germs. Germs can directly invade the tender shoots and tender needles that year, but also through the wounds, stoma invasion of needles, buds, shoots and branches. Latency 7 ~ 14d, breeding period 23 ~ 28d.