Medicinal plant mint leaf spot

Symptoms mainly affected the leaves, with small black spot on the foliage, expanded into a circle to irregularly shaped edges, black, and central gray and white lesions, and the rim was not clear. The fruiting body was born on both sides of the leaf, with a layer of grey black mold. The late lesions merged, causing the leaves to dry off, and the lower leaves were susceptible to disease.

The pathogen, Cercospora menthicola Tehon et Daniels, is known as Spore of mint, a fungus belonging to the genus Deuteromycotina. Small, superficial, brown, diameter 23-67μm; conidial stems clustered, 5--22, brown, cylindrical unbranched, separated by 2-9, with geniculate segments 0-4 Apical truncated or nearly truncated, with marked spore marks; sporulating cell size 84-2174-6 (μm), coapted; conidiophore whip-colored, base truncate or subtruncate, apically obtuse or minute Sharp, with 5-15 separate, size 47-2502. O—4.7(μm)

Transmission Path and Pathogenic Conditions Germs and mycelia are overwintering on the sick body and become the primary source of infection in the following year. Guangdong, Yunnan, August, September, October and November occurred in a widespread manner and caused serious damage.

Control methods (1) Apply compost or fermented organic fertilizer made from fermented bacteria. (2) Carefully clear the garden before entering the winter and concentrate on burning the diseased body. (3) In the early stage of onset, spray 50% polymyco (Toxuroxime) WP 1000 times or 75% chlorothalonil wettable powder 500 times, and 40% Sulfur suspension 500-600 times. 60% anti-mildew treasure ultra-wettable powder 800 times, 50% benomyl wettable powder 1500 times, every 667m2 spray good liquid 50L, every 10 days 1 time, continuous control 2-3 times. The drug was stopped 7 days before harvest.

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