Vegetable Disease Control Recommendations


Beans (snap, lima)




Dark, sunken, circular or oval pod spots; brown borders and salmon-colored ooze in spots; leaves and stems also infected.


Spray with Maneb or Zineb or dust with Maneb at first sign of disease and weekly thereafter; also, use Bordeaux mixture.

Bacterial blight

Brown or tan spots or blotches with a yellow border on leaves; pods may have brick-red or brown sunken blotches.


Seeds fail to grow; young plants die.

Root and stem rot Plant wilts and dies; plant is decayed on lower roots and stem.

Rust Brown spots (pustules) on leaves.

Broccoli, brussels Club root fungus Roots become enlarged; plants wilt sprouts, cabbage, and finally die.

cauliflower, and other "cole" crops

Yellows Leaves turn yellow; plants are often deformed.

Use disease-free seed.

Treat seeds with Captan dust, or apply Captan to soil at planting time.

Apply Captan to soil at planting time.

Use Maneb or Bravo. Sulfur dust can also be applied at weekly intervals.

Grow only in well-drained soil. Choose resistant varieties.

Black rot Blackleg

Damping off; stem rot

Infections make leaves yellow or tan; leaf veins and vascular ring iq stem may be black; head may decay.

Young plants die; seeds may rot.

Rotate cabbage with other crops; plant disease-free seed; use Bordeaux mixture.

Keep garden tools clean; remove debris; follow crop rotation.

Treat seed with Captan dust; work Captan into soil in accordance with instructions.

Corn Bacterial wilt


Cantaloupe, cucumber, Anthracnose pumpkin and watermelon

Bacterial wilt Fruit rot

Powdery mildew Peas Damping off

Downy mildew Fusarium wilt

Pepper Bacterial spot

Long pale-green or tan dead streaks on leaves; may cause stunting and death of plants.

Galls on leaves, stems, ears or tassels continue to enlarge, turn black and break open.

Dark sunken, circular or oval pod spots; brown borders and salmon colored ooze in center, on fruits, stems and borders.

Vines wilt and die.

Rotted fruit; gray, moldy growth; decay at blossom end of squash.

White, powdery growth on surface of leaves and stems.

Seeds fall to grow; young plants die.

White mode on underside of leaves.

Seedlings wilt and die; older plants growth is stunted.

Irregular tan or dark-brown spots on leaves.

The disease bacteria is carried by flea beetles, so use insecticides to control; use resistant varieties.

Cut off the galls before they break open and destroy.

Spray with Maneb at first sign of disease and continue weekly as needed.

The bacteria is transmitted by cucumber beetle—use insecticide to control the beetles.

Spray with Maneb at the first sign of disease and continue weekly.

Spray with Karathane or Benomyl.. .at weekly intervals sulfur dust.

Buy treated seed; treat seed with Captan dust or apply to soil at planting time.

Grow resistant varieties. Grow resistant varieties.

Spray with fixed copper at first sign of disease and then weekly as needed. ►




Potato Black leg

Late blight


Squash Bacterial wilt

Blossom end rot Leaf Spot

Fruit rot

Powdery mildew Scab

Sweet Potato Scurf

Tomato Blossom end rot

Early blight

Stems decayed and blackened at or below ground line; tops grow poorly.

Dead areas on leaves—brown or dark purple; white or gray moldy growth on leaf underside.

Black, rough, scabby patches appear on the skin.

Leaves suddenly start to wilt; cucumber beetles in evidence, especially on young plants.

Flowers become rotted, deformed.

Dried brown spots on leaves soon become holes.

Rot attacks squash resting on moist ground.

Powdery white material appears on leaves.

Brown holes in fruit.

Irregular purple-brown discoloration.

Leathery black or dark-brown decay on the blossom end of fruit.

Dark-brown spots with concentric rings on leaves, stems and fruits.

Fusarium and verticillium Leaves turn yellow and fall on one wilt side of the plant before the other;

vascular tissue may have dark discoloration; leaves wilt.

Late blight Brown or dark-purple dead areas on leaves; white or gray moldy growth on leaf underside.

Vegetables in general Southern stem blight Decay of stem near ground line; often heavy white fungus growth.

Virus Mottling, mosaic yellowing of leaves or fruits; some malformation in shape of leaves or fruit.

Plants disease-free tubers. Do not plant cold potatoes into cold soil.

Plant disease-free tubers; spray foliage at first sign of disease with zinc-ion, Maneb, Zineb, fixed copper, or Bravo.

Grow resistant varieties.

Dust with Sevin or Diazinon; may be necessary to destroy all infected plants.

Spray blossoms with Maneb or Zineb. Spray with Zineb or Captan.

Prevent by growing on black plastic.

Dust with sulfur.

Spray with Maneb.

Use only disease-free potato roots.

Can be cut down or eliminated by maintaining a uniform soil moisture.

Spray foliage with zinc-ion Maneb, Maneb, Zineb, fixed copper or Bravo at first signs of disease and at weekly intervals.

Use resistant tomato varieties; rotate garden crops.

Use partially resistant varieties; apply zinc-ion Maneb, Maneb, Zineb, fixed copper or Bravo at the first signs of disease and at weekly intervals.

Rotate crops.

Use resistant varieties; clean up weeds and garden residue.

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