Blister Beetles

This striped beetle is both friend and foe; adults feed on pepper plants and other vegetables, but their larvae eat grasshopper eggs. Knock adults from plants into soapy water, but wear gloves because contact with crushed beetles blisters skin.

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Pepper Weevils

These ¼-inch-long, dark gray insects lay eggs in pepper buds or fruits. The larvae leave dark cavities in the spongy inner tissues of pepper fruits. Invite natural predators such as birds and wasps to dine on these pests.

Root-Knot Nematodes

Microscopic soil-dwelling worms cause plants to wilt and lack vigor. To eradicate nematodes, grow a cover crop of marigolds or rye in infested areas and turn.

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Viruses
Mosaic is the most serious viral disease for peppers. Leaves become narrow and thickened, and they appear stringy. Pull and dispose of severely affected plants.

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Article source: Rodales Organic Life
Image source: same as above