At the beginning, the spot is yellow brown, surrounded by yellow green halos, and then expanded into nearly round or irregular spots, with dark brown edge. At the later stage, there are small black dots on the spots.
A small amount of diseased spots are found on the leaves. You can apply the cream of dakinin cream on them and cut off the branches with more diseased.
In the early stage of the disease, 50% carbendazim WP 500 times solution can be used for prevention and treatment, once every 7-10 days. In serious cases, spray again on the fourth day according to the actual situation, and then spray once every 7 days. 3-4 times in a row, the control effect is good.
Brown spot mainly damages the leaves of Chimonanthus mume, producing yellow brown to light brown spots with a diameter of 0.1-0.5cm.
It was found that a small number of diseased leaves were removed and burned in time. In the early stage of the disease, 70% of mancozeb replaceable powder 400 times liquid was sprayed every 10 days for 3-4 times continuously.
In the environment of bad light, bad ventilation, high temperature and humidity, many kinds of scale insects are easy to occur. When the disease occurs, there will be many small white protuberances on the leaves, which will affect the viewing. In the later stage, the scale insect sucks the leaf juice, which causes the leaf damage and affects the plant growth.
If a small amount of scale insects are found, they can be washed with water or scraped off with bamboo sticks.
In serious cases, 45% malathion emulsifiable concentrate can be used for 1000 times spray killing. Do not use pesticides as much as possible during family maintenance, and pay attention to the concentration of biological agents in time to avoid affecting family health.
