Rust of spruce
Spruce rust is only distributed in Tianshan area. The incidence of the disease is high, but there are few diseased cones. The susceptible cones no longer grow and die quickly.
Symptoms: the disease harms the scales of male and female cones. The susceptible female cone is thin and small, curved, the scales open, the scales become lanceolate, and the cones turn yellow and no longer grow. A pile of teliospores with small yellow scales and orange-red projections.
Pathogen: the pathogen is Chrysomyxadeformans (Diet.) Jacz., which belongs to basidiomycetes subphylum, Alternaria, Puccinia and Puccinia.
The regularity of the disease: the pathogen only has the stage of teliospore. At the beginning of summer, spores from overwintering diseased buds invade female or male cones, producing yellow spots and teliospores. In cloudy and rainy weather, teliospores can germinate and produce basidiospores, which spread to the newly produced buds of spruce by airflow, that is, invading the buds to survive the winter.
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snow mold of spruce
Spruce snow mold is mainly distributed in some countries north of 40 degrees north latitude, harming cedar, fir and spruce trees. The disease was found only on spruce trees in China. Symptoms: The whole plant and needles on the ground are infected under snow, covered with gray brown mycelium layer, or mycelium invades the host interior, causing mildew and suffocation of trees. The hyphae layer of mild disease was cotton-wool, felt-like in severe cases, brown in early stage, white and grayish brown when it was about to melt. When the disease is mild, the disease is distributed in clumps. In severe cases, trees fall into rows
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Thick plum cone rust of spruce
Spruce thick plum cone rust occurs in Inner Mongolia, Jilin, Heilongjiang, Sichuan, Yunnan, Xizang, Shaanxi, Gansu, Qinghai, * and other places in China. The disease harms thick branch spruce, yew spruce, Lijiang spruce, oil wheat spruce, fish scale spruce, Xueling spruce, * spruce and so on. Symptoms: the disease harms the positive scales of female cones. The susceptible scales are twisted, anti-curled and disordered. There are many purple-brown globules on the front, which are arranged in a layer, which are the sporidium of the pathogen, and sometimes the spores are also produced on the back of the scale. Pathogen: the pathogen is Cunninghamia lanceolata
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