Yellow leaves on beans, cucumbers and melons
"The white moths are the adults of cabbage worms, so they're most attracted to cabbage family crops such as broccoli, cabbage, cauliflower, and kale. If you see feeding injury on any of these, you can apply Bt (Bacillus thuringiensis) to control them.
A certain amount of yellowing of leaves is normal on the crops you mention, especially if it's not associated with leaf spots or browning also. Yellowing could be an indication that the crops need a bit more fertility, too."
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