The following are some recommended methods for controlling rainbow bean embroidery disease:

1. Start spraying at the early stage of the disease with 15% triadimefon wettable powder 1000-1500 times, or 40% Fosfomycin emulsifiable concentrate 8000 times, or 50% chlormequat emulsifiable concentrate 800 times, or 50% sulphur suspending agent 200 times, or 30% solid rock sulfur 150 times liquid, or 25% diliver emulsion 3000 times liquid, or 65% zinc diclofenac wettable powder 500 times liquid, or 50% carbendazim wettable powder 800-1000 times liquid.

2. Don't cultivate cowpea in succession in spring and fall.

3. Do not water before rain.

These drugs and measures have some control effect, but the specific method and frequency of use need to be determined according to the condition and the actual situation, and it is recommended to consult crop protection experts or people who are experienced in planting.