The harm degree of heart rot is relatively large, once neglected, improper management, it will lead to different degrees of loss. The key point of prevention and treatment of this disease lies in "prevention".
It is the most effective method to eliminate and burn or bury the diseased plants. At the same time, it is necessary to spray 1% Bordeaux solution to the surrounding environment and plants after eliminating the diseased plants. It can also spray 65% zinc 500 times and ammonium 300 times every year from March to June, once a week, and strengthen the management of fertilizer and water, control the water content, and do not bias the application of nitrogen fertilizer, so as to prevent the harm of scale insects.
The disease is manifested as the initially reddish brown round red spot, which is soon linked to the lesion and enlarged to form irregular blotch. In severe cases, the whole leaf is withered, and it can be treated with carbendazim or methyl tozin 800 times.
