There area couple of issues here. First, chewing insects are decimating the leaves. Possibly grasshoppers or earwigs? And secondly, the white spots can be caused by several different pests: aphids, leafhoppers or spider mites.
Leafhoppers are green, brown, or yellow bugs to ⅓-inch long with wedge-shaped wings. They jump sideways and suck the juices from plants. Use insecticidal soap. Cover plants with floating row covers to exclude bugs; spray with insecticidal soap.
Spider mites or aphids suck plant juices causing stippling. Top of leaves speckled or stippled white or yellow; fine gray webbing on undersides of leaves; leaves eventually turn pale green, yellow then brown. Keep plants well watered. Wash mites off leaves with spray of water or use insecticidal soap. Ladybugs and lacewings eat mites.
It looks like you have drip irrigation? That’s good because some damage can be done by overhead watering on a hot day. With the drip, you won’t have to re-apply the insecticidal soap as often.
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