Yellow leaves on beans, cucumbers and melons

"Planting garden for first time this year. All seems to be doing well, however, the snap beans the cucumbers and melons have leaves that are turning yellow. The snap beans have flowered and are producing beans. The cucumbers and melons are new and are not yet flowering. I have seen the white moths in the garden, but I haven't found the eggs yet. Mostly the white moths seem to be in the Chard."
Submitted by BHGPhotoContest

"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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