Orchid rust: Uredonegrpunctata

(synonym: Uredo Cyrtopodii)

The summer spore pile (n) is found on the back of the leaves, showing irregular light black masses, containing cinnamon brown summer spores. The sexual sporangium (O), rust sporidium (I) and teliosporium (dish) are unknown.

(1) harm: it has been reported that the harmful hosts of the bacteria are Bletia purpures, Epidendrum tamPense, Bletia Patula,CyrtoPodium Punctatum and StanhoPea sp. The pathogen was found in the United States, Brazil, Argentina and other countries.

(2) symptoms: the symptoms caused by the bacteria on Epidendrum tampense and Sphenospora

The symptoms caused by kevorkianii on this host are similar. The diseased forest forms typical irregular orange and black spore piles on both sides of the leaves. On StanhoPea sP. The spores pile light brown to dark brown, protruding, often appearing on the back of the leaves.

(3) Prevention and treatment: remove and burn all diseased leaves, spray 800 times solution of Fumei, add a small amount of spreading agent to the solution, and treat it every 7 days.

Liu Zhongjian