Pinus tabulae formis Carr. Is a pine tree evergreen tree. A pine resin was used as a solid resin that was retained after the volatile oil was removed with oleoresin from Pinus tabulaeformis. In addition, pine knot, pine pollen, pine needles, pine bark, etc. can also be used as medicine. With wet dampness, myogenic pain, active and other effects. Distributed in Shaanxi, Anhui, Zhejiang, Fujian, Taiwan, Henan, Hubei, Hunan, Guangdong, Guangxi, Sichuan, Guizhou, Yunnan and other provinces.
Symptoms: The pine needles of the infected pine needles have a whitish green patch of varying lengths. The pimple-like brown dots on the front of the patch are lined up and then turned into dark brown. On the opposite side of the brown papules, a yellow-white to orange-colored crop is produced. High 1-1.5mm. After the mature crop, the yellow powder was scattered and left behind a white patch, which broke off later. The diseased leaves gradually yellow and fall off. The main branch of Pinus tabulaeformis, which is onset each year, becomes shorter and the pine branches are dry or the whole plant is dead. (Figure left)
Pathogen Coleosporium solidaginies (Schw.) Thum. A stalk of yellow rust is a basidiomycotina fungus. The rust spores were born on both sides of the needles, with a lingual coating, a light yellow string of rusty spores, a nearly spherical or elliptical shape, a smooth spore wall, and dense cotyledons. Its host host is a yellow flower and aster, and its leaves are backed with orange and yellow summer spores, grouped or scattered. The summer spores are yellow, spherical or subglobose, and the spores are small and dense. The episodic teliospore heap produces cylindrical stalkless teliospores.
Transmission Pathogens and Pathogenic Conditions The fungal winter spores invade the conifers after winter and overwinter. In April of the following year, after the mature rust spore device, rust spores were scattered and transmitted to the yellow sprigs or purpurea leaves and damaged by wind and rain. In May and June, the uredia spores were produced, and the uredia spores were reinfected to form teliospores in autumn. heap.
Prevention and control methods (1) Remove solid yellow flowers, purpura, etc. to the host host, remove the source of infection, can effectively prevent and treat the disease. (2) If necessary, spray Baume 0.5 lime sulfur mixture.
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