Are all the green bean leaves here or the leaves of two kinds of beans? The leaves on the top of Figure 1 look different from the leaves on the bottom. The two leaves at the bottom of Figure 1 consider the situation of green bean carob spots and leaf spots. It is recommended to use difenoconazole or azoxystrobin, copper thiacetin or copper quinolate foliar fertilizer spray treatment, once every 6-7 days, and spray twice continuously.

What is drawn in black above, if it is a cowpea leaf, consider sooty mold. Sooty mold, yellow spots appear on the front, and there is a thin gray-black mold layer on the back leaves. Generally, during the picking period, it is easy to get infected quickly in humid and foggy weather. It also appears in the seedling stage, (especially in continuous cropping fields or fields where beans are often planted.). In the early stage of the disease, it is recommended to take iprodione, procymidazole, or imazalil, or fludioxon, cyprodinil, or cyprodinil, or pyclostrobin, or pyraclostrobin and triflufenacil, etc. Add foliar fertilizer spray to control. Generally speaking, sooty mold can be prevented and controlled when it first starts to appear on the cotyledons at the bottom. Spray must be made when sooty mold has just begun to be infected. It is best to spray it when it has just spread to less than 20 centimeters above the ground, once every 5-7 days. Hit 2-3 times in a row.