Disease:Fusarium wilt Pathogen: Fusarium oxysporum f. sp. pisi. Races 1, 5, and 6 of the fungus cause true wilt symptoms; race 2 isolates produce near-wilt symptoms. Races 5 and 6 are economically important in western Washington and southwest British Columbia. Races 1 and 2 reportedly are in all pea-growing regions of Oregon and Washington.
Disease:Pea seedborne mosaic Pathogen: Pea seedborne mosaic virus (PSbMV).
Host Crops: Pea and at least 46 other plant species in 12 families, of which only a few are economically important hosts, including lentil, vetch, chickpea, and pea.
Disease:Root rot complex caused by mixed infections of Fusarium wilt (FW), Aphanomyces root rot (ARR) and Fusarium root rot (FRR). Pathogen: Fusarium oxysporum f. sp. pisi (FW), Aphanomyces euteiches (ARR), and Fusarium solani f. sp. pisi (FRR). Host Crop: Pea
Chlorosis, leading to necrosis, of the lower leaves of pea plants infected with the root rot complex that consists of the pathogens that cause Aphanomyces root rot, Fusarium wilt, and Fusarium root rot. All three diseases alone will cause leaf chlorosis that begins with the lowest leaves on the plant and moves towards the top of the plant. Chlorotic leaves will turn necrotic as the plant matures. Chlorosis of leaves from the bottom of the plant to the top of the plant is most pronounced when Fusarium wilt is involved. Severe infection by Fusarium root rot will stunt the plant but, in general, will not kill the plant. Severe infections by Fusarium wilt or Aphanomyces root rot will generally kill the plants.
Common name: Seedcorn maggot Latin binomial: Delia platura Host crops: Many vegetable crops including snap, kidney, and lima beans, onion, corn, turnip, pea, cabbage, and cucurbits. They cause the most damage in spring to newly emerging seedlings, and can cause severe losses in plant stand.
Photo Source: Lindsey du Toit, Washington State University
Causal Organism/Agent: “In-Place” is a deposition aid and drift management agent added as a tank mix with pesticides to reduce spray drift during applications. The active ingredients of In-Place are modified vegetable oil, aliphatic mineral oil, amine salts of organic acids, and aromatic acid.
Host Crops: Pea.
Photo Source: Lyndon Porter, USDA ARS
Adjuvant Damage on Pea, Identification & Management of Emerging Vegetable Problems in the Pacific Northwest. Pacific Northwest Vegetable Extension Group.
Problem :Edema A physiological problem most prominent when air is cooler than the soil, soil moisture is high, and relative humidity is high. The low plant transpiration rate combined with an increase in water absorption by roots from the soil leads to increased cell turgor pressure, resulting in eruption of epidermal cells as the inner cells enlarge. Protrusion of the inner cells causes epidermal cells to die and discolor, resulting in a ’warty’ appearance that can be misidentified as a disease. Symptoms are usually worse on lower leaf vs. upper leaf surfaces. Some pea cultivars are more prone to this condition than others. Host crops: Numerous vegetables including brassicas, cucurbits, pea, spinach, tomato, etc.
Photo Source: Joanne Henderson, Thunder Bay, Ontario, Canada
What are these bumps on my vegetables? Edema or oedema: It doesn’t matter how you spell it, it still doesn’t look good. What is it, what causes it and how can I prevent it? Michigan State University Extension