Cycas reginae, Cycas revoluta Thunb. Aliases Tieshu, Fengwei brown, Phoenix banana and other. Is a Cycadaceae evergreen tree. Use leaves, roots, flowers and seeds as medicine. With astringent bleeding, detoxification, pain, kidney essence, lower blood pressure effect. Fujian, Guangxi, Guangdong and Yunnan all have production. It is cultivated everywhere. Color 2031617 Symptoms also known as vitiligo, leaf disease mostly from the tip of the tip or the base to produce a nearly circular to irregular shaped lesions, size 1-5mm, the central dark brown to gray-white, red-brown edges, the upper black dots. Lesion fusion can cause the leaves to dry or dead.
The pathogenic Ascochyta cycadina Scalia is known as Cyperus subsp. Conidiophores spherical to oblate spheroids, born in foliar, size 100-239μm, dark brown. Conidia ovoid or cylindric, twin, constricted or absent at diaphragm, size 8-113.2-4.2 (μm), colorless or slightly light brown.
Transmission routes and pathogenic conditions The pathogens use winter silk or conidia to overwinter on diseased leaves, and conidia are produced in the following year, transmitted by wind and rain. The occurrence of high temperature and rain will take place, and the weight of the soil will be too heavy or the potted cycads will be placed on the concrete ground.
Prevention methods (1) Select a deep soil layer with weakly acidic sandy soil to stop cultivation. (2) The cultivation environment should be airy and light, and do not put it on the cement floor when potted. (3) Spraying 25% Benzophenil EC 800 times or 50% thiophanate-methyl WP 600 times at the beginning of the disease.
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