Sandalwood scientific name Santalum album L. Is a semi-parasitic or evergreen small tree. Medicinal dried heartwood. With qi, and stomach, the effectiveness of pain. Distributed in Taiwan, Guangdong and other places.
Symptoms of damage to the leaves, the initial coal-like small spots, after the expansion, thickening, the formation of a circular to irregular shape, black, uneven thickness of the soot layer, affecting the photosynthesis of plants, often associated with scale insects.
The pathogenic Asterinella sp. phylloxera leaves are scattered on both sides, scattered, spreading, round or irregular, black, mycelium dense mesh, mycelial wavy, irregular branches, dark brown, width 5-6μm Head-like attachments alternate or lateral, with 1 division, apical cells with or without inflated, straight, 3- 41.5-2 (μm), short stalk cells, no adherent branches, no bristles on the cells The ascus capsule is shield-shaped, set or scattered, the upper part is composed of radial, mycelium, resembling a shield plate, dark brown to black, centrally dehiscent; diameter 110-141μm, no mature ascospores; conidia Similar to the shield-like ascospore shell, slightly smaller, pale in colour, light brown to dark brown, 72-90 μm in diameter; conidia ellipsoid to ovate, obtuse at one end or slightly pointed at one end, unit cell, brown To dark brown, there is a central crescent-shaped transparent area, 19-248-10 (μm).
Transmission routes and onset conditions occurred from October of drought in southern China to March of the following year, and sometimes the entire leaf was soot.
See methods for prevention and cure
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