Photo Gallery of Vegetable Problems
Pea
General Pea Disease and Pest Management
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General Pea Disease and Pest Management
Pea Disease Diagnostic Series, North Dakota Agricultural Experiment Station
Diseases
Disease: Aphanomyces root rot
Pathogen: Aphanomyces euteiches
Host Crop: Pea
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Aphanomyces Root Rot
Pea Disease Diagnostic Series - Aphanomyces root rot, North Dakota Agricultural Experiment Station
Disease: Downy mildew
Pathogen: Peronospora viciae
External lesion on the pod. | Infected pod showing internal signs of the pathogen. | ||
Photo Source: G.Q. Pelter | Photo Source: D.A. Inglis | Photo Source: Lyndon Porter |
Sporulating localized leaf lesions. | Sporulating systemic leaf infection. |
Photo Source: Lyndon Porter |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Downy Mildew
Disease: Fusarium root rot
Pathogen: Fusarium solani f. sp. pisi
Fusarium root rot on pea roots (infection from inoculated peas grown in a greenhouse). Root lesions tend to be dark black in color. | |||
Photo Source: Lyndon Porter |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Root Rots
Pea Disease Diagnostic Series - Fusarium root rot, North Dakota Agricultural Experiment Station
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.
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Wilt and Near-wilt
Pea Disease Diagnostic Series - Fusarium wilt, North Dakota Agricultural Experiment Station
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.
Photo Source: Rebecca McGee |
Photo Source: Lyndon Porter, USDA-ARS |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Pea Seedborne Mosaic
Pea
Disease Diagnostic Series - Pea seedborne mosaic virus, North Dakota Agricultural Experiment
Station
Disease: Powdery mildew
Pathogen: Erysiphe pisi
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Powdery Mildew
Pea: Powdery mildew, Washington State University Hortsense
Pea
Disease Diagnostic Series - Powdery mildew, North Dakota Agricultural Experiment
Station
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
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Root Rots
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Aphanomyces Root Rot
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Wilt and Near-wilt
Pea
Disease Diagnostic Series - Fusarium root rot, North Dakota Agricultural Experiment
Station
Disease: Thielaviopsis root rot
Pathogen: Thielaviopsis basicola
Host Crops: Alfalfa, bean, carrot, corn, pea, pepper and many other plant species.
Whole pea plants with black roots from Thielaviopsis root rot. |
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Photo Source: Lindsey du Toit |
Photo Source: Lyndon Porter |
Photo Source: Jordan Eggers |
Photo Source: Jordan Eggers |
On-Line Resources:
Thielaviopsis Root Rot of Pea, Identification & Management of Emerging Vegetable Problems in the Pacific Northwest. Pacific Northwest Vegetable Extension Group.
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Root Rots
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Seed Rot and Damping-off
Emerging and Common Disease Issues in Peas, USDA-ARS.
Root Rots of Pea, University of Illinois Extension.
Nematodes
Disease: Pea cyst nematode
Pathogen: Heterodera goettingiana
Photo Source: D.A. Inglis |
Photo Source: D.A. Inglis |
(white cyst stage) |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Pea (Pisum sativum) – Nematode, Cyst
Common name: Root lesion nematode
Latin binomial:: Pratylenchus penetrans
Host Crops: Pea and many vegetables/other plant species.
On-Line Resources:
Root Lesion Nematodes on Pea, Identification & Management of Emerging Vegetable Problems in the Pacific Northwest, Pacific Northwest Vegetable Extension Group.
Insect/Mite Pests
Common name: Pea moth
Latin binomial: Cydia nigricana
Host crops: Pea, sweet pea, and vetch
On-Line Resources:
Pea Moth, WSU PLS-59, Washington State University
Pea moth, Pest Spotter, Bayer CropScience
Pea moth, Royal Horticultural Society
Pacific Northwest Insect Management Handbook: Pea, green and dry-Pea moth
Common name: Pea weevil
Latin binomial: Bruchus pisorum
Host crops: Pea (Pisum spp.)
Photo Source: Lyndon Porter, USDA-ARS plant pathologist |
Close-up image of a weevil through a microscope | |
Photo Source: Lyndon Porter, USDA-ARS plant pathologist | Photo Source: Tim Waters, WSU Extension Educator for Benton/Franklin Counties |
On-Line Resources:
Pacific Northwest Insect Management Handbook: Pea, green and dry-Pea weevil
Pea Weevil: Bruchus pisorum (Linnaeus) (Coleoptera: Chrysomelidae), SARDI, Pests and Diseases
Pea Weevil: Bruchus pisorum (Linnaeus), Canadian Grain Commission
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.
Magnified image of a seedcorn maggot. | Damage to pea seedlings caused by the seedcorn maggot. |
Photo Source: Lindsey du Toit, Washington State University |
Online Resources:
Seedcorn maggot, Vegetable Crop Pests, Pacific Northwest Insect Management Handbook
Seedcorn Maggot, University of California IPM Pest Management Guidelines, Corn
Seed Corn Maggot, VegEdge, Vegetable IPM Resource for the Midwest, University of Minnesota
Hosts and Pests of Vegetable Crops, Pacific Northwest Insect Management Handbook
Abiotic Problems
Disease: Adjuvant Damage
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.
On-Line Resources:
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.
Increasingly severe symptoms of edema on pods of the pea cv. Mrs. Van’s. Peas within the pods do not develop symptoms and are edible. | |||
Photo Source: Joanne Henderson, Thunder Bay, Ontario, Canada |
Online Resources:
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
https://hort.uwex.edu/articles/edema/ University of Wisconsin Extension
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