Control methods:
Shilu Huanglian is mainly produced in the primeval forest area of Dafengpu, Huangshui National Forest Park, Huangshui Town, Shizhu County. The unique climate, water quality and soil conditions in this area are the best growth areas for Shiluo Huanglian. In 1991, the Ministry of Agriculture Investment in the establishment of the National Yellow River Huangpi GAP demonstration base, the town has also established China's largest Coptis market. Natural plant Raw materials Agricultural products are not any additives. Traditional Huanglian kang, baking with firewood, drying, hair removal with bamboo cage trough, the species are hand-selected, remove the impurities and minced, relatively clean.
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The pathogen of Lagerstroemia brown spot is a fungus that mainly invades the leaves, and usually the lower leaves begin to develop and spread gradually upwards. In the early stage of the disease, lesions are of various sizes, round or nearly circular, ranging from purple black to black, with lighter edges. Subsequently, the color of lesions deepened, and the boundary between healthy and healthy parts became clear. The color of the lesions in the center of the lesions has faded and the gray and black mold spots have appeared. When the disease is severe, the lesions are connected and the entire leaf quickly turns yellow and falls off prematurely.
The infestation of Lagerstroemia brown spot is caused by the infection of C. littoralis. The pathogenic bacteria is wintered on the diseased body in the form of mycelium or conidia, and the initial infection and re-invasion are carried out by the conidia the following year. Dyed and spread by air currents or wind and rain. It is easy to break out in high temperature and rainy season, especially when the storm is frequent. Usually, the lower leaves are more susceptible than the upper leaves.
Early detection and prevention of horticulture, timely removal of diseased branches, diseased leaves, and concentrated burned or buried in order to reduce the source of bacteria. Strengthen cultivation management, pruning, and make plants airy and transparent.
In the early stage of the disease prevention and control, it can spray 50% carbendazim WP 500 times, or 65% dexamethasone WP 1000 times, or 75% chlorothalonil WP 800 times.
How to Prevent and Control Crape Leaf Spot
Brown spot often occurs in the crape myrtle growing season. Severe occurrence of brown spots often leads to a large number of yellow leaves and fall off of plants, affecting ornamental and flowering.