When yellow cabbage is attacked by rust, the infected leaves, flower stems, etc. will produce some spots, and the surface will roll. Generally, the whole leaf will turn yellow, and even the leaves on the plant will die. The solution is to apply fertilizer reasonably, drain water after raining, and avoid ponding or too wet soil. Once rust is found, it can be sprayed once every 7 to 10 days, 2 to 3 times.
Leaf blight generally damages the leaves of plants. At first, it will appear white round spots, and then it will gradually dry up. If it is too wet, it will generate black mold. The specific treatment is to spray chlorothalonil on the surface of the leaves with the same frequency and frequency.
The damage of anthrax is mainly on the leaves. The tip of the leaves will change from dark green to dark yellow, producing small black spots. Even the leaves will die. The specific method of prevention and control is to spray 1:1:100 Bordeaux solution or chlorothalonil solution at the beginning.
When the red spider harms the broccoli, it will suck the juice on the leaf surface and appear the gray spots. If it is serious, it will also cause the plant to die. It can be sprayed with 73% clot 2000 times.
The harm of aphids is usually in May, from leaves to flowers, they will be sucking juice, causing flowers to fall off. It is recommended to spray with dimethoate.
