Disease & Pests: If plants turn yellow and wither from the ground up just after flowering, you may have pea root rot from a soil fungus. It infects the plant in early spring when the soil is very wet. Prevent it by delaying planting until the soil is drier and by using finished compost when you plant. Rotate peas into new areas each year without repeating an area for 3-4 years. Pea enation disease is a Coastal virus disease spread by the green peach aphid. It ends flowering and causes pods to become warty and misshapen.
The pea moth is a sporadic and usually inconspicuous pest. The tiny brown moth flutters around when the flowers are just opening, and lays it eggs on the immature seed pod. The damage the caterpillar does not mean you can’t eat the rest of the peas in the pod. The larva is a tiny caterpillar with a black head, which feeds inside the seedpod and overwinters in the soil. There is one generation per year across Canada. In the pea-growing areas of the lower Fraser Valley in British Columbia, releases of two parasites have provided partially effective biological control. In general, processing and fresh-market pea crops should not be grown in areas with dry (seed) pea or seed vetch crops. After harvest, all remaining pods and vines should be destroyed by ensiling, feeding, or deep cultivating.
Companion Planting: Superb companions for beans, carrots, celery, corn, cucumber, eggplant, parsley, peppers. potatoes, radish, spinach, strawberries and turnips. Avoid planting peas near onions.