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Pea - Diseases, Pests and Problems





Basic Information



Problem: Aphids
Affected Area: Leaf

Description: Small Insects found on new stems and the underside of the leaf. Usually green. They suck fluids from the plant leaving a honey dew substance behind. Leaves turn pale yellow.

Control: Insecticidal soaps or a strong stream of water. Ladybug beetles are natural predators. * Thiodan or Diazinon ? more than one application may be required. A layer of aluminum foil under plants reflects light to underside of leaves and may deter aphids. * Pesticide use and recommendations for various areas are constantly changing. Check with your County agent for current recommendations.


Problem: Cutworms
Affected Area: Above ground portion of the plant

Description: Plants chewed off just above ground level. Cutworms are caterpillars that are up to 1 1/2" long and mottled or striped green, brown or gray. When they are disturbed, they roll up in a coil. They usually position themselves at the moisture line in the soil moving up and down according to the water content. If the soil surface is dry, they will be found a couple of inches below the surface where the moisture begins. When newly watered, they will be at the surface.

Control: Put cardboard collar around new transplants to extend 1" to 2" above and below soil level.


Problem: Slugs and Snails
Affected Area: Entire plant

Description: Large portions of young plants missing.

Control: Slugs and snails are very susceptible to desiccation (drying) and require a moist, shady place to live. Cultural practices which promote a sunny, dry environment will discourage them. Avoid too-frequent waterings allowing soil surface to dry out between irrigations. Keep garden free of debris, boards, bricks, and stones where they hide. Hand picking these pests is very effective. Create ?traps? for hand picking by laying boards in the garden. Slugs and snails will congregate under them. Lift the boards each morning and collect the slugs and snails. Dispose of them completely as they will crawl back if tossed out of the garden and eggs inside dead pests can still hatch to produce more of these pests. Slug and snail bait containing metaldehyde can be placed near food plants as long as they do not contact edible portions of the crop. Most effective when moistened, but not water logged. Snail bait attracts slugs and snails from several feet away so bait stations are effective. Stations help protect birds, pets and other non-target animals which are also attracted to the bait. Place small piles of bit under a slightly propped up board or use container such as a cottage cheese or yogurt carton. Bury carton to the mouth of the container. Place small amount of commercial bait inside and moisten with apple juice, orange juice or water. Cut hole in lid to allow access and place lid on container. Containers may also hold beer or yeast water to attract slugs and snails in where they drown. Place bait stations wherever slugs and snails are active or around perimeter of garden.


Problem: Fusarium wilt
Affected Area: Leaf

Description: Yellowing of lower leaves stunted growth, wilting, and eventually dying.

Control: Pull up and destroy infected plants. Rotate planting location. Use disease-resistant varieties.


Problem: Powdery Mildew
Affected Area: Leaf

Description: Leaves with white, powdery growth on top.

Control: Use sulfur dust. Destroy infected plants. Use treated seeds.


Problem: Aphanomyces Root Rot
Affected Area: Root

Description: This disease is characterized by firm, straw-colored lesions that are found on the roots. These lesions spread through the cortex and eventually develop a discolored root system. The disease can be visible one to two weeks after the infection occurs. The best form of control is to check fielding before planting and avoid infested fields.

Control: There are no resistant cultivars available for control at this time.


Problem: Bean Leaf Roll Virus
Affected Area: Above ground portion of the plant

Description: This disease is characterized by plants that are suffering from severe stunting and often die before they bloom. As the disease progresses and matures, the stunting will continue and the plant may experience yellowing of the entire plant and sudden collapse leading to death.

Control: The best form of control is to use resistant cultivars.


Problem: Downy Mildew
Affected Area: Leaf

Description: This disease is characterized by stunted and distorted plants with fungus growing on all the plant surfaces. These plants may turn yellow while producing more fungus for secondary infections. The plant will develop lesions that are greenish, yellow to brown in color on the upper leaf surfaces and mouse-gray, fluffy areas on the undersides of the leaves directly under the upper lesions.

Control: The best forms of control are to use resistant cultivars and fungicides.


Problem: Pea Enation
Affected Area: Above ground portion of the plant

Description: This disease is characterized by plant distortion, as the plant is still young. As the plant grows and matures, it may take on symptoms of stunted plant growth, yellow flecks, leaf and pod distortion and reduced seed size and quality.

Control: The best form of control is the use of resistant cultivars.


Problem: Pea Seedborne Mosaic
Affected Area: Entire Plant

Description: This disease is characterized by stunted and malformed plants that may also never reach maturity.

Control: The best form of control is to use resistant cultivars.


Problem: Pea Stunt
Affected Area: Entire Plant

Description: This disease kills young plants very early before they get a chance to bloom. As the plants become older, the infections will cause stunted growth and terminal rotting.

Control: The best method of control is to use resistant cultivars.


Problem: Powdery Mildew
Affected Area: Leaf

Description: This disease is characterized by small lesions that appear on the upper surface of the lowest and older leaves. These lesions are scattered on the leaves and as they mature and develop they look like white, powdery areas. Severely infected areas may even look blue-white.

Control: Fortunately, there are resistant cultivars available and should be used since they offer the best form on control. However, other control measures can be used which include chemical control with benomyl or sulfur, but must be properly timed to be effective. Also, planting early and using sprinkler irrigation will minimize the chances of having a crop infected with powdery mildew.


Problem: Rhizoctonia Solani Seedling Rot
Affected Area: Seed

Description: This disease is characterized by lesions that appear to be water-soaked as the seedling emerges. These lesions will develop a reddish brown to brown color and often the growing point may be affected causing it to die. Mature plants that become infected will also develop the reddish brown, sunken lesions that may girdle the plant and cause severe stunting.

Control: The best form of control is to apply fungicidal seed treatment chemicals in connection with insecticide applications of captan.






Pea

Tips

Warm season crops can be interplanted with peas. After peas are harvested, warm season crops will fill the space.

 

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