Photo Gallery of Vegetable Problems
Potato
General Potato Disease and Pest Management |
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Diseases |
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Nematodes |
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Insect/Mite Pests |
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Abiotic Problems Common to Potato |
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(Click on photo to enlarge)
General Potato Disease and Pest Management
Integrated Management of Storage Diseases, (Video Presentation), Focus on Potato, Plant Management Network International
Diseases
Disease: Aster yellows
Pathogen: Aster yellows phytoplasma
Vector: Aster leafhopper (Macrosteles fascifrons) and other leafhoppers, and the phytoplasma can be carried in infected tubers
Host crops: Over 300 kinds of plants, including a wide variety of vegetables. Broccoli, cabbage, carrot, onion, potato, pumpkin, radish, shallot, spinach, squash, tomato, and more.
Potato plant with a seed-borne infection of the aster yellows phytoplasma. |
Photo Source: Carrie Wohleb, WSU Extension Educator, Grant/Adams Counties |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Aster – Yellows
Disease: Bacterial soft rot
Pathogen: Pectobacterium
On-Line Resources:
Bacterial Soft Rot and Lenticel Spot on Potato Tubers, Washington State University Extension Fact Sheet.
Potato: Bacterial soft rot and blackleg, Washington State University Hortsense
Potato Progress, Volume 15, Number 12, dated September 8, 2015.
Research & Extension for the Potato Industry of Idaho, Oregon, and
Washington. This issue covers the many details of bacterial soft rot
diseases of potato and how they should be managed late season and in
storage.
Disease: Black dot
Pathogen: Colletotrichum coccodes
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Black Dot
Disease: Black leg
Pathogen: Erwinia species
Potato ‘Norgold’ | Potato ‘Ranger Russet’ (mid season symptoms) | Potato ‘Norkotah’ Hail damage 3 days post hail storm as comparison |
Photo Source: G.Q. Pelter |
On-Line Resources:
‘Focus on Potato’ Webcast Helps Users Minimize Spread of Blackleg
Blackleg, caused by strains of soft rot bacteria known as Dickeya, has traditionally had little impact on North American potato production, but it now appears to be on the move throughout Europe and could threaten growers in the United States.
The Plant Management Network (PMN) has released a presentation entitled “Dickeya: A Scottish, UK and European Perspective” to provide growers and consultants an overview of the history of the disease in Europe, and an introduction to Dickeya solani, a new aggressive pathogen strain contributing to an increase in the incidence and spread of blackleg. The webcast was developed by Gerry Saddler, Deputy Head of Science & Advice Scottish Agriculture with the Scottish Government, and details that country’s potato production practices and explains why they have adopted a national zero-tolerance approach to the presence of Dickeya strains. The presentation discusses:
· Causes of blackleg and symptoms exhibited
by different strains
· Conditions that encourage infection and common transmission methods
· Inspection and testing practices employed in Scotland
· Effective control measures to limit spread
The 40-minute presentation will remain open access through July 31 in
the
Focus on Potato webcast resource. The Plant Management Network is a
nonprofit publisher of applied, science-based resources that help enhance
the health, management, and production of agricultural and horticultural
crops. Partnering with over 80 universities, nonprofits, and
agribusinesses, PMN provides materials covering a wide range of crops and
contemporary issues through the
online PMN Education Center.
Potato: Bacterial soft rot and blackleg, Washington State University Hortsense
Potato Progress, Volume 15, Number 12, dated September 8, 2015. Research & Extension for the Potato Industry of Idaho, Oregon, and Washington. This issue covers the many details of bacterial soft rot diseases of potato and how they should be managed late season and in storage.
Soft Rot and Blackleg Diseases of Potato, Plant Management Network International
Disease: Black scurf
Pathogen: Rhizoctonia solani
On-Line Resources:
Potato: Rhizoctonia canker (Black scurf), Washington State University
Disease: Corky ring spot
Pathogen: Tobacco rattle virus, transmitted by soilborne nematodes, Trichodorus spp. and Paratrichodorus spp.
Internal tuber symptoms of corky ringspot. | |
Photo Source: Jordan Eggers, Oregon State University |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Corky Ringspot
Disease: Curly top
Pathogen: Beet curly top virus (BCTV), vectored by the beet leafhopper Circulifer tenellus
Host crops: Numerous plant species including many vegetables such as bean, beet, carrot, eggplant, coriander, pepper, potato, tomato, and various cucurbits such as squash, cucumber, pumpkin, watermelon, etc.
Symptoms of curly top on tomato leaves. | |||
Photo Source: E. J. Sorensen | Photo Source: Phil Hamm, Oregon State University |
Symptoms of curly top on tomato leaves. | |
Photo Source: Krishna Mohan, University of Idaho |
On-Line Resources:
Disease: Early blight
Pathogen: Alternaria solani
Early blight lesion on tuber. | Early blight lesion on leaf. |
Photo Source: G.Q. Pelter | Photo Source: The American Phytopathological Society |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Early Blight
Early Blight: A Global Management Issue on Potatoes (Video Presentation), Focus on Potato, Plant Management Network International.
Focus on Potato webcast: “Best
Management Tactics and Fungicide Resistance in Early Blight and Brown
Spot”
by Dr. Lydia Tymon, plant pathologist
at Washington State University.
Disease: Early dying
Pathogen: Meloidogyne and Verticillium
On-Line Resources:
Potato: Verticillium Wilt (Potato early dying), Washington State University Hortsense
Disease: Erwinia
Pathogen: Erwinia
Potato ‘Ranger Russet’ (early stem symptoms) |
Photo Source: G.Q. Pelter |
On-Line Resources:
Disease: Fusarium Dry Rot
Pathogen: Fusarium spp.
Photo Source: D. A. Inglis and B. Gundersen |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Fusarium Dry Rot
Fusarium Dry Rot of Potatoes, Plant Management Network International
Disease: Late Blight
Pathogen: Phytophthora infestans
Photo Source: D.A. Inglis and J. Gigot |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Late Blight
Organic Management of Late Blight of Potato and Tomato (Phytophthora infestans), eXtension.
Potato Late Blight, Plant Management Network International. (video)
A potato late blight forecasting model for the Columbia Basin can be accessed via the WSU AgWeatherNet website at https://weather.wsu.edu/. Subscription to AgWeatherNet is free of charge.
ARS Scientists Seek Blight-Resistant Spuds, USDA Agricultural Research Service.
Potato Diseases: Late Blight, Extension Bulletin E-2945, Michigan State University.
Disease: Leaf roll (net necrosis symptoms on potato tubers)
Pathogen: Potato leaf roll virus
Primary symptoms. | Net necrosis. | Net necrosis caused by PLRV in steam-peeled tubers of the cultivar Russet Burbank. | |
Photo Source: G.Q. Pelter | Photo Source: Jordan Eggers, Oregon State University |
On-Line Resources:
Potato: Potato leafroll mosaic (Leafroll), Washington State University Hortsense
Common name: Lygus bugs
Latin binomial: Lygus spp.
Host crops: Numerous different species of vegetables and other crops,
e.g., alfalfa, beet, cabbage, carrot, potato, spinach, Swiss chard,etc. Lygus bugs can cause different types of damage to various growth stages of different crops. They cause blackheart on celery, blasting on flower tissues, collapse of asparagus spears, decreased yields in carrot, beet, spinach, and other seed crops, etc.
Symptoms of feeding injury from lygus bugs on potato plants. | An adult lygus bug. | ||
Photo Source: Oregon State University HAREC Irrigated Agricultural Entomology Program (Silvia Rondon) |
An adult lygus bug. |
Photo Source: Oregon State University EESC |
On-Line Resources:
Pacific Northwest Insect Management Handbook: Carrot seed – Lygus bug
Lygus bugs on potatoes in the Pacific Northwest. Josephine Antwi, Silvia I. Rondon, and Rodney Cooper, Oregon State University Extension Service Bulletin EM9173, 2017.
Lygus
Control in Potato, 2016. Silvia I. Rondon and Daniel I. Thompson,
Arthropod Management Tests, 2017, 1–2, Oxford University Press, 2017.
Disease: Mop Top
Pathogen: Potato mop-top virus (PMTV), a pomovirus vectored by the soilborne organism, Spongospora subterrenea. The latter also causes powdery scab (see Powdery scab below)
Symptoms of Potato mop top virus infection of tubers of various potato cultivars. | ||
Photo Source: Jordan Eggers |
On-Line Resources:
Common Name: Pink eye of potato
Latin binomial: Unknown causal agent, occasionally observed in white- and russet-skinned cultivars, but not red-skinned cultivars. The disease has been associated with some bacteria, and is reported to be more severe in cultivars susceptible to Verticillium wilt.
Symptoms of pink eye of potato tubers. | A potato tuber illuminated with ultraviolet light, glowing as a result of pink eye. | |
Photo Source: Jordan Egger, Oregon State University |
On-Line Resources:
Potato – Pink Eye or Brown Eye, Vegetable MD Online, Cornell University
Pink Eye of Potato, Prince Edward Island Department of Agriculture and Forestry, Canada
Relationship of Verticillium Wilt with Pink-Eye of Potato in Maine, USDA National Agricultural Library’s Digital Collections
Disease: Pink rot
Pathogen: Phytophthora erythroseptica
Photo Source: G.Q. Pelter | Photo Source: Jordan Eggers, Oregon State University |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Pink Rot
Disease: Powdery scab
Pathogen: Spongospora subterranea
Symptoms on root. | Note raised lesions on the tuber surface where the epidermis has broken away to expose dark, powdery masses. |
Photo Source: G.Q. Pelter | Photo Source: Babette Gundersen |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Powdery Scab
Potato: Powdery scab, Washington State University Hortsense
Disease: Purple Top
Pathogen: Beet leafhopper transmitted virescence agent (BLTVA), a phytoplasma
Vector: Beet leafhopper (Circulifer tenellus), and the phytoplasma can be carried in infected tubers.
Symptoms on a stem and leaves of a potato plant infected with BLTVA as a result of current-season infection. |
Photo Source: Pete Thomas, USDA-ARS Prosser |
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Purple Top
Disease: PVY
Pathogen: Potato virus Y (PVY), a virus transmitted mechanically and by insects (aphids)
Severe symptoms of Potato virus Y infection on the potato cultivar Chieftain. | |
Photo Source: Babette Gunderson, Washington State University |
On-Line Resources:
Seedborne Potato Virus Y (PVY), Identification & Management of Emerging Vegetable Problems in the Pacific Northwest. Pacific Northwest Vegetable Extension Group.
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Latent Viruses
Disease: Pythium
Pathogen: Pythium species
On-Line Resources:
Disease: Pythium leak
Pathogen: Pythium species
On-Line Resources:
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Leak
Disease: Rhizoctonia stem lesion
Pathogen: Rhizoctonia solani
Aerial tubers caused by Rhizoctonia stem lesion. | |
Photo Source: D.A. Inglis |
On-Line Resources:
Disease: Ring rot
Pathogen: Clavibacter michiganensis subsp. sepedonicus
On-Line Resources:
Bacterial Ring Rot on Potatoes, Washington State University Extension Fact Sheet FS102E
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Ring Rot
Potato: Bacterial Ring Rot, UC IPM Online, University of California
Bacterial Ring Rot of Potatoes, Ohio State University Extension Fact Sheet
Disease: Ring rot and soft rot
Pathogen: Bacterial species
On-Line Resources:
Bacterial Soft Rot and Lenticel Spot on Potato Tubers, Washington State University Extension Fact Sheet.
Potato: Bacterial Soft Rot and Blackleg, UC IPM Online
Soft Rot and Blackleg Diseases of Potato, Plant Management Network International
Video series:
Disease management of soft rot bacteria in potatoes. Authors: Noah
Rosenzweig and Saltanat Mambetova, Michigan State University Department
of Plant, Soil and Microbial Sciences; James DeDecker, Monica Jean and
Frederick Springborn, Michigan State University Extension. Michigan State
University Extension, 2019.
Disease: Silver scurf
Pathogen: Helminthosporium solani
On-Line Resources:
Silver Scurf Management in Potatoes, Oregon State University, University of Idaho, Washington State University
Pacific Northwest Plant Disease Management Handbook: Potato (Solanum tuberosum) – Silver Scurf
Disease: Skin stain symptoms
Pathogen: Fusarium species
On-Line Resources:
Disease: Tomato spotted wilt
Pathogen: Tomato spotted wilt virus (TSWV)
Foliar symptoms of tomato spotted wilt on a potato plant. | |
Photo Source: Jordan Eggers and Phil Hamm |
On-Line Resources: This disease is more commonly associated with tomato and other crops than with potato.
Pacific Northwest Plant Disease Management Handbook: Tomato (Lycopersicon esculentum) – Tomato Spotted Wilt, See Also: Greenhouse Plants, Ornamental Impatiens Necrotic Spot
Tomato Spotted Wilt Virus, Vegetable MD Online, Cornell University
First Report of Tomato spotted wilt virus Causing Potato Tuber Necrosis in Texas. APS Journals, The American Phytopathological Socitey
Disease: Verticillium wilt
Pathogen: Verticillium dahliae
Host crops: Numerous vegetables including many brassica vegetables (but not broccoli), cucumber, eggplant, pepper, potato, pumpkin, radish, spinach, tomato, watermelon, etc.
Photo Source: G.Q. Pelter |
On-Line Resources:
Potato: Verticillium wilt (Potato early dying), Washington State University Hortsense
See Diseases, pests, and other problems common to many vegetables: Verticillium wilt.
Disease: White mold
Pathogen: Sclerotinia sclerotiorum
Host crops: Bean, various brassica vegetables, carrot, eggplant, lettuce, potato, tomato, etc.
On-Line Resources:
White Mold of Potato: Epidemiology and Management, Plant Management Network International.
See Diseases, pests, and other problems common to many vegetables: White mold.
Disease: Zebra chip
Pathogen: Candidatus Liberibacter Solanacearum
Vector: Potato psyllid, Bactericera cockerelli
On-Line Resources: Information on the Potato psyllid.
The Zebra Chip Project, Texas Agrilife Research and Extension Center at Amarillo.
Phil Hamm’s message to the industry.
Nematodes
Disease: Root knot
Pathogen: Meloidogyne species
Host crops: Numerous plant species, including many vegetables such as carrot, coriander, onion, potato, etc.
Photo Source: G.Q. Pelter |
On-Line Resources:
See Diseases, pests, and other problems common to many vegetables: Root knot
Insect/Mite Pests
2019 Integrated Pest Management Guidelines for Insects and Mites in Idaho, Oregon and Washington Potatoes (PDF), authored by Alan Schreiber (Agriculture Development Group, Inc.), Andrew Jensen (Northwest Potato Research Consortium), Silvia Rondon (Oregon State University), Erik Wenninger (University of Idaho), Stuart Reitz (Oregon State University), Tim Waters (Washington State University). Updated June 2019.
Common Name: Green peach aphid and potato aphid
Latin binomial: Myzus persicae and Macrosiphum euphorbiae, respectively
Host crops: In addition to potato, tomato, eggplant and pepper, the green peach aphid can feed on many other vegetables including broccoli, cabbage, spinach, Swiss chard, squash, pumpkin, beet as well as many weed species including Brassicaceae (cruciferous) weeds. The potato aphid can feed on cucumber, potato, melon, tomato, pumpkins, squash, and corn seed.
Green peach aphid may be found along the midrib on the underside of leaves of a host plant. Mature aphids are about 2 mm long (ca. 1/16 inch), egg-shaped, and the color of the wingless nymphs and adults ranges from pinkish yellow to yellowish green. There are usually multiple individuals in a single colony. | The green peach aphid tends to overwinter in stone fruit trees. By late May to early June, individual aphids in a colony develop wings and fly to vegetable crops and a wide range of weeds. As the aphids disperse (June to August), they can transmit important viruses including potato leaf roll virus and potato virus Y. | The easiest way to scout for aphid colonies is to search perimeter vegetable plants for copious amounts of sticky, glistening honeydew coating the upper surfaces of lower leaves of plants. Honeydew may contain numerous cast (shed) skins (white to gray) and a black sooty mold (fungus) that colonizes aphid honeydew. |
Photo Source: Michael Bush, WSU Extension, Yakima, WA |
On-Line Resources:
Pacific Northwest Insect Management Handbook: Vegetable crop pests-Aphid
Pacific Northwest Insect Management Handbook: Potato, Irish – Aphid
Common Insect & Mite: Aphids, Washington State University Hortsense.
See Diseases, pests, and other problems common to many vegetables: Aphids
For aphids on other crops see: pumpkin, and squash
Common Name: Beet leafhopper
Latin binomial: Circulifer tenellus
Host crops: Wide host range, including many vegetables. The Beet leafhopper is able to transmit a phytoplasma, the beet leafhopper transmitted virescence agent (BLTVA), to plants such as potato, carrot, and radish. It can also transmit the curly top virus to plants such as bean, tomato, pepper, pumpkin, and squash.
The adult beet leafhopper is a small, wedge-shaped insect, approximately 1/8 inch long. |
Photo Source: Andy Jensen, Washington Potato Commission |
On-Line Resources:
Pacific Northwest Insect Management Handbook: Potato, Irish – Leafhopper
Potato: Beet Leafhopper, UC IPM Online, University of California
Common Name: Blister beetle
Latin binomial: Epicauta spp. including E. maculata
Host Crops: Blister beetles are typically considered beneficial insects as the larvae feed on grasshopper eggs, but they are occasional pests on crops such as alfalfa, beets, beans, clover, potatoes, other vegetable and field crops, and native plants.
On-Line Resources:
Blister Beetles: Coleptera: Meloidae Epicauta maculata, E. fabricii, E. puncticollis, Lytta nutalli. Modified from G. Bishop, et al. 1982. Management of Potato Insects in the Western States, Integrated Plant Protection Center of Oregon State University.
Blister Beetles, Identification & Management of Emerging Vegetable Problems in the Pacific Northwest. Pacific Northwest Vegetable Extension Group.
See Diseases, pests, and other problems common to many vegetables: Blister beetle.
Common Name: Colorado potato beetle
Latin binomial: Leptinotarsa decemlineata (Say).
Host Crops: potato and tomato. Will feed on eggplant, tobacco and weeds in the Solanum genus.
On-Line Resources:
Pacific Northwest Insect Management Handbook. Chapter: Irish Potatoes, Section: Colorado potato beetle to Cutworm and Armyworm.
Common Name: Flea beetle
Latin binomial: Pictured is the western potato flea beetle, Epitrix subcrinita, but the tuber flea beetle, Epitrix tuberis, may also damage foliage.
Host crops: Eggplant, pepper, potato, and tomato.
On-Line Resources:
Organic Management of Flea Beetles (PDF), by Joyce Parker (Washington State University Department of Entomology), Carol Miles (Washington State University Department of Horticulture), Todd Murray ( Washington State University Extension Skamania County), William Snyder (Washington State University Department of Entomology). Pacific Northwest Extension Publication PNW640
Potato Flea Beetles: Biology and Control (PDF), Washington State University Extension Bulletin 1198E.
Pacific Northwest Insect Management Handbook. Chapter: Irish Potatoes, Section: Flea Beetle to Grasshopper.
Vegetables: Potato: Potato flea beetles. Washington State University Hortsense.
See Diseases, pests, and other problems common to many vegetables: Flea beetle.
Common Name: Potato psyllid;
psyllid yellows
Latin binomial: Bactericera cockerelli;
Psyllid yellows is said to be caused by a toxin in the saliva of psyllid nymphs
as they feed on potato plants. The condition is still poorly understood and some
have argued it might be caused by a pathogen (e.g., a phytoplasma or bacterium)
in the saliva that has not yet been characterized. Studies have shown recovery
of potato plants after removal of psyllids, which supports the toxin theory.
On-Line Resources: Information on the Potato psyllid.
The Zebra Chip Project, Texas Agrilife Research and Extensioin Center at Amarillo.
Phil Hamm’s message to the industry.
Potato Psyllids, Zebra Chip, Psyllid Yellows, WSU Potato Pest Alert, August 26,
2016
Common Name: Spider mites
Latin binomial: Tetranychus spp. including twospotted spider mite (Tetranychus urticae), strawberry spider mite (Tetranychus turkestani), and Pacific spider mite (Tetranychus pacificus)
Host crops: Wide host range, including many vegetables such as bean, carrot seed crops, potato, etc.
Twospotted spider mite on potato. | Eggs of the two-spotted spider mite, Tetranychus urticae. |
Photo Source:Silvia Rondon, Oregon State University |
On-Line Resources:
Some Common Plant-Feeding Mites and Plant-Inhabiting Mite Predators in the Northwestern United States. PNW Insect Management Handbook.
Lima Bean – Spider Mites. PNW Insect Management Handbook.
Carrot seed – Twospotted spider mite. PNW Insect Management Handbook, Chapter: Vegetable Seed, Section: Carrot Seed.
Managing spider mites in gardens and landscapes. University of California Online Statewide Integrated Pest Management Program.
See See Diseases, pests, and other problems common to many vegetables: Spider mites.
Common name (of damaging stage): Tomato hornworm
Latin binomial: Manduca quinquemaculata
Host crops: Pepper, eggplant, potato, and tomato.
On-Line Resources:
Pacific Northwest Insect Management Handbook. Washington State Chapter: Vegetables, Section: Tomato Part2: Fleabeetle to Wireworm.
Vegetables: Tomato: Tomato hornworm. Washington State University Hortsense.
UC Pest Management Guidelines: Tomato Hornworms. UC IPM Online, University of California.
Common Name: Tuberworm
Latin binomial: Phthorimaea operculella.
Tuberworm adults. Female on left, male on right | Potato tuberworm larval damage to potato tubers. | ||
Photo Source: Silvia Rondon |
Tuberworm larva. |
Photo Source: Lynn Ketchum |
On-Line Resources:
Biology and Management of the Potato Tuberworm in the Pacific Northwest. PNW 594
New Emerging Pests in the Pacific Northwest. The Potato Association of America.
Pacific Northwest Insect Management Handbook. Chapter: Irish Potatoes, Section: Tuberworm to Wireworm.
Common Name: Western flower thrips
Latin binomial: Frankliniella occidentalis.
Host crops: Basil, Broccoli, Cabbage, Cauliflower, Cucumber, Onion, Potato, Pumpkin, Squash, Tomato and Watermelon.
Closeup of thrips. | Thrips damage on potato leaf. |
Photo Source: Silvia Rondon |
On-Line Resources:
Pacific Northwest Insect Management Handbook. Chapter: Irish Potatoes, Section: Lygus bug to Thrips.
See Diseases, pests, and other problems common to many vegetables: Western flower thrips.
Common Name(of damaging stage): Wireworm
Latin binomial: Pictured are Limonius spp. (including L. canus and L. californicus). Other wireworm species including Agriotes spp. and Ctenicera spp. can be pestiferous.
Host Crops: Potato, onion, carrot, beet, spinach seed crops and radish. Other crops, like corn, beans and peas can be impacted by high densities of wireworms feeding on seedlings resulting in poor crop stands.
A click beetle of the species Agriotes obscurus, the larvae of which are wireworms. | A click beetle of the species Limonius californicus, the larvae of which are wireworms. | A click beetle of the species Limonius canus, the larvae of which are wireworms. | |
Photo Source: Oregon State University – Oregon State Arthropod Collection. |
On-Line Resources:
WIREWORMS Coleoptera: Elateridae, Pacific Coast Wireworm Limonius canus, Sugarbeet Wireworm L. californicus, Great Basin Wireworm Ctenicera pruinina. Integrated Plant Protection Center of Oregon State University.
Wireworm Biology and Nonchemical Management in Potatoes in the Pacific Northwest. Extension Bulletin PNW 607.
Pacific Northwest Insect Management Handbook. Chapter: Irish Potatoes, Section: Tuberworm to Wireworm.
Wireworm Field Guide - A guide to the identification and control of wireworms, Syngenta Crop Protection Canada, Inc.
Wireworm Biology and Nonchemical Management in Potatoes in the Pacific Northwest, N. Andrews, M. Ambrosino, G. Fisher, and S.I. Rondon, Pacific Northwest Extension Publication no. PNW607
See Diseases, pests, and other problems common to many vegetables: Wireworm.
Abiotic Problems Common to Potato
Common name: 2,4-D herbicide drift injury
Cause: Drift of the broadleaf herbicide 2,4-D into potato crops.
Host Crops: Most broadleaf plants are susceptible to injury by 2,4-D.
Symptoms of injury from drift of the herbicide 2,4-D into a potato crop. | |
Photo Source: Carrie H. Wohleb, Washington State University |
Online Resources:
2,4-D- and Dicamba-tolerant Crops— Some Facts to Consider
Problem: Herbicide carryover in potato seed
Crops affected: Most, if not all, crops can be affected by herbicides used to control weeds.
On-Line Resources:
Herbicide Carryover in Potato Seed. Identification & Management of Emerging Vegetable Problems in the Pacific Northwest, Pacific Northwest Vegetable Extension Group.
Common name:
Herbicide injury
Cause: Accidental exposure of potato to the herbicides Goal (oxyfluorfen) and Buctril (bromoxynil) applied by chemigation to an adjacent onion crop.
Host Crops: Most broadleaf plants are susceptible to injury by the herbicides Goal and Buctril.
On-Line Resources:
Common name:
Air pollution or ozone injury
Cause: During very hot conditions, combined with the presence of
excessive air particulate matter, e.g., from wildfires, symptoms of air
pollution and/or ozone injury have been observed in center-pivot irrigated
potato crops east of the Cascade Mountains in the Pacific Northwest USA.
Host Crops: Potato and other vegetables, e.g., bean and corn.
Possible symptoms of ozone or air pollution injury to potato crops. | |||
Photo Source: Carrie H. Wohleb, Washington State University Extension |
Possible symptoms of ozone or air pollution injury to potato crops. |
Photo Source: Carrie H. Wohleb, Washington State University Extension |
Problem: Physiological leaf roll
Cause: Various environmental conditions and management practices
Crops affected: Tomato and Potato.
Photo Source: PNW VEG members |
On-Line Resources:
Physiological Leaf Roll of Tomato/Potato, Identification & Management of Emerging Vegetable Problems in the Pacific Northwest. Pacific Northwest Vegetable Extension Group.
Physiological Leaf Roll of Tomato, A Fact Sheet prepared by The Pacific Northwest Vegetable Extension Group
Problem: Toxic seed piece syndrome
Crop affected: Potato.
On-Line Resources:
Toxic Seed Piece Syndrome (TSPS). Identification & Management of Emerging Vegetable Problems in the Pacific Northwest, Pacific Northwest Vegetable Extension Group.
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