Mulberry brown spot disease, also known as rotten leaf disease, focal spot disease, and plaque disease, is one of the main diseases of the mulberry leaf.

High temperature and humidity are most beneficial to the occurrence of mulberry brown spot disease, and the majority of wetness is the main cause of the disease. Secondly, mulberry gardens are planted densely, with poor ventilation and light transmission, partial application of nitrogen fertilizer, and poor management of mulberry gardens. Furthermore, the occurrence of mulberry brown spot disease is also closely related to the disease resistance of mulberry varieties.

Control method

Prevention and control of mulberry brown spot disease should be carried out from the aspects of eliminating pathogenic bacteria, improving cultivation techniques and management of fertilization, and actively implementing the principle of “prevention first and comprehensive prevention”.

Improve cultivation techniques and strengthen management of fertilization. First of all, when planting mulberry trees, it should be reasonably densely planted, and the mulberry gardens with low sorghum and moisture should be drained in time. At the same time, strengthen the mulberry field farming and weeding work, in order to promote the mulberry garden ventilation. Secondly, fertilization should be based on farmyard manure and organic manure. When applying fertilizer, rational application of phosphorus and potassium fertilizer should be carried out according to the actual conditions of each place. Where conditions permit, scientific fertilization can be carried out after soil testing formula, thereby enhancing the disease resistance of mulberry trees. ability.

Reduce the presence of overwintering pathogens. This is the most direct and effective way to prevent mulberry brown spot. When conducting mulberry garden winter management, the ground should be turned over 1 time (depth 30~40 cm). After deep turning, the pathogens should be fully exposed and exposed to sunlight to reduce the density of pathogens. At the same time, in addition to the weeds in the mulberry garden, pick up the fallen leaves on the ground and remove the damaged leaves (this should be done before the leaves) and incinerate them in a unified way. When pruning in winter, the diseased branches, weak branches, dead branches, and insects should be wounded. The branches are also cut off and burned. For example, when a large number of diseases occur during the mulberry growing season, the diseased leaves should be removed in time and buried in a unified manner to reduce the proliferation of pathogenic bacteria.

Take effective medicine to control the rule: In the early stage of the disease, it can be sprayed with 50% carbendazim WP 1000-1500 times or 70% 托布津 WP 1500 times, and then sprayed once every 10~15 days. The condition can be well controlled. In severely affected areas, 50% carbendazim WP 1000-1500 times solution, 70% thiophanate WP 1500 times or 65% sensible zinc WP 2000 times should be used in time after each sericulture. The liquid is sprayed on the mulberry garden.