Potato Field Manuals

Blackleg
Blackleg is a common and often severe disease of potatoes that is caused…
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Pink Eye
Pink eye or brown eye is caused by the bacterium Pseudomonas fluorescens,…
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Ring Rot
Ring rot is caused by a highly infectious bacterium, Corynebacterium…
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Scab
The microorganism that causes potato scab, Streptomyces scabies, infects…
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Bacterial Soft Rot
Bacterial soft rot is very wide spread and usually occurs in association…
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Black Dot
Black dot is caused by the fungus Colletotrichum atramentarium. It is a…
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Early Blight
Moist canopy conditions, caused by rain or sprinkler irrigation, favor the…
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Fusarium Dry Rot
Fusarium dry rot is a serious storage disease caused by one of several…
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Fusarium Wilt
Fusarium wilt is favored by high temperatures; hot, dry seasons, and high…
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Late Blight
Late blight is a serious disease where cool, damp weather occurs regularly…
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Leak
Leak, also called watery wound rot, may occur sporadically wherever…
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Pink Rot
Pink rot or water rot is occasionally found in potato fields and is most…
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Rhizoctonia
Rhizoctonia is a commonly occurring soil fungus, one strain of which…
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Aerial Tubers
Small, green tubers may form at the base of stems when diseases interfere…
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Seed Piece Decay
Spores of the soil fungus Fusarium exist everywhere, and may infect the…
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Silver Scurf
Silver scurf is probably present in all of the major potato growing areas…
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Stem Rot
Stem rot, caused by Sclerotium rolfsii affects potatoes primarily in the…
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Verticillium Wilt
Verticillium wilt, caused by the soil-inhabiting fungi Verticillium…
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Wart
Potato wart, caused by the fungus Synchytrium endobioticum is widely…
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White Mold
The fungus that causes white mold, Sclerotinia sclerotiorum, infects…
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Calico
Calico is a yellow patch-like mottling of potato foliage that is caused by…
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Corky Ringspot
Corky ringspot is caused by tobacco rattle virus, which is transmitted by…
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Leaf Roll
Potato Leaf Roll Virus (PLRV) can be seedborne, but is generally spread by…
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Mosaic Virus
A mosaic disease is caused by a single virus or by a combination of…
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Spindle Tuber
Spindle tuber is caused by a virus-like agent called potato spindle tuber…
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Root Knot Nematode
Several species of root knot nematode, Meloidogyne species, are known to…
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Golden Nematode
Also called potato root eelworm, golden nematode is a very serious…
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Black Heart
Blackheart results from inadequate oxygen supply for respiration of…
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Brown Center (Hollow Heart)
Brown center, sometimes called incipient hollow heart, is an area of dead,…
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Growth Cracks
Growth cracks usually follow the long axis of the tuber and result from…
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Heat Sprouts
Heat sprouts develop when the soil temperature is very high, accompanied…
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Internal Brown Spot
Often called "heat necrosis." Several causes are possible; the most common…
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Internal Sprouting
Sprouts that develop during storage may become ingrown by penetrating into…
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Jelly End
Conditions such as moisture stress and high temperatures early to…
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Knobs or Second Growth
Second growth is commonly attributed to high field temperatures and…
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Multiple Sprout
Multiple sprout is a physiological disorder characterized by formation of…
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Secondary Tubers or Blind Sprouts
Tubers that sprout either in storage or in the field, producing new tubers…
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Stem End Browning
Stem-end browning describes an internal, brown discoloration of tubers…
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Sunburn or Green-End
Exposure to sunlight in the field before harvest causes greening of the…
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Bruise
If tubers are handled roughly during harvest or when removed from storage,…
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Frost Damage
Frost injury occurs when the temperature of the leaf tissue falls below…
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Freezing Injury
Freezing injury occurs when the pulp temperature of a tuber drops below 29…
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Hail Injury
Foliar injury ranges from tears or ragged holes in the leaves to…
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Lightning Damage
When a bolt of lightning strikes a potato field, the plants are killed…
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Aldicarb Injury (such as Temik)
Aldicarb injury is characterized by small interveinal spots which are…
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Dicamba Injury (such as Banvel)
Spray drift or the presence of dicamba residues in the soil cause the…
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Disulfoton Injury (such as Disyston)
Both disulfoton and aldicarb injury are most likely to occur where the…
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E.P.T.C. Injury (such as Eptam)
High rates or overlapping can cause injury to the potatoes. Symptoms…
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Maleic Hydazide Injury (such as MH)
Foliar symptoms consist of a rather indistinct general paling of the…
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Metribuzin Injury (such as Sencor)
If cool, cloudy weather follows metribuzin application, injury to potato…
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Picloram Injury (such as Tordon)
Residues or drift of picloram cause distorted growth that is very similar…
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Trifluralin Injury (such as Treflan)
Most likely to occur when application is made before planting or when the…
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Blister Beetle
Blister beetles are either black, gray, gray with black spots or stripes,…
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Colorado Potato Beetle
Adults are round, convex, yellow beetles with black stripes. Larval forms…
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Cutworms
Several species of cutworms feed on potatoes, all of which are long and…
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Flea Beetles
Adults are very small, metallic black beetles. They jump readily when…
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Garden Symphylan
These centipede-like animals live in the spaces be-tween soil particles.…
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Grasshopper
Grasshoppers are pests of potatoes only during years when they migrate out…
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Potato Leafhopper
Leafhoppers feed on the undersurface of potato leaves, causing a speckled…
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Leather Jackets (Crane Fly)
Leatherjackets winter in the soil as mature larvae. Adults emerge in the…
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Loopers
Larvae are greenish, white-striped, ranging in size from 1/4 to 1-1/4…
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Potato Tuberworm
Potato tuberworm is adapted to hot, dry conditions. The adult is a moth.…
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White Grub
White grubs attack tubers in the soil, causing rough, irregular shaped…
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Wireworms
Wireworm larvae are hard bodied, slender, cylindrical, shiny,…
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Winged Green Peach Aphid
Green peach aphids transmit leaf roll virus, which causes yield and…
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Lygus Bug
Lygus bugs are general feeders. They inject a toxin during feeding causing…
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Potato Aphid
Potato aphids (dark green in color with relatively long legs and prominent…
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Spider Mite
Spider mites damage plants by puncturing the leaf tissue with their mouth…
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Thrips
Thrips cause damage by producing a silvery scarring on the underside of…
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