Pacific Northwest Vegetable Extension Group

of Washington State University, Oregon State University, and University of Idaho

Photo Gallery of Vegetable Problems

Pepper

(Click on photo to enlarge)

General Pepper Disease and Pest Management

Bacterial spot damages Michigan peppers, Spring and summer rains favor disease; coppers can help but not cure bacterial spot on peppers. Mary Hausbeck, Michigan State University.


Diseases

Disease: Gray mold
Pathogen: Botrytis cinerea

Photo of gray mold on pepper Photo of gray mold on pepper Photo of gray mold on pepper

Photo Source: Photographer – Sharon Collman
Submitted by Jenny Glass

On-Line Resources:

Pepper Diseases: Gray Mold: Botrytis cinerea, AVRDC – The World Vegetable Center.

Insect/Mite Pests

Disease: Brown marmorated stink bug (BMSB)
Latin binomial: Halyomorpha halys
Host crops: Very wide host range including Oregon berry, grape, tree fruits, hazelnuts, vegetables including pepper, ornamentals, etc.

Photo of pepper showing symptoms from brown marmorated stink bug damage Photo of pepper showing symptoms from brown marmorated stink bug damage Photo of pepper showing symptoms from brown marmorated stink bug damage Photo of pepper showing symptoms from brown marmorated stink bug damage
       
Photo Source: Nik Wimann, Oregon State University
Photo of pepper showing symptoms from brown marmorated stink bug damage Photo of symptoms of feeding injury on pepper fruit from BMSB pepper-brown-marmorated-stink-bug-10Photo of symptoms of feeding injury on pepper fruit from BMSB Photo of brown marmorated stink bugs feeding on pepper fruit
  Symptoms of feeding injury on pepper fruit from the brown marmorated stink bug. Brown marmorated stink bugs (immatures and adults) feeding on pepper fruit.
Photo Source: Nik Wimann, Oregon State University Photo Source: Todd Murray, Washington State University Skamania County Extension Photo Source: Peter Shearer, Oregon State University Entomologist
Photo of brown marmorated stink bugs feeding on pepper fruit Photo of brown marmorated stink bugs feeding on pepper fruit
Brown marmorated stink bugs (immatures and adults) feeding on pepper fruit.
Photo Source: Peter Shearer, Oregon State University Entomologist

On-Line Resources:

Brown Marmorated Stink Bug in Oregon, Oregon State University

Pest Watch: brown Marmorated Stink Bug, Washington State University Extension Fact Sheet FS0079E

Pest Alert: Brown Marmorated Stink Bug, A quick ID guide from the Oregon Department of Agriculture

See Diseases, pests, and other problems common to many vegetables: Brown marmorated stink bug (BMSB).
 

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.

Photo of potato flea beetle damage on potato foliage Photo of adult potato flea beetle Photo of adult potato flea beetle showing enlarged hind legs
Potato flea beetle damage on potato foliage appears as scallop-like scoops, rounded pits or shotholes originating from the underside of the potato leaf. The adult flea beetle is small (~1/16 inch long), oblong, and dark brown to bronze in color. The most distinctive feature of the flea beetle is the enlarged hind legs that provide the insect the ability to jump considerable distances when approached or disturbed.
Photo Source: Michael Bush, WSU Extension, Yakima, WA

On-Line Resources:

Potato Flea Beetles: Biology and Control. Washington State University Extension Bulletin 1198E.

Potato Flea Beetles. Coleoptera: Chrysomelidae Western Potato Flea Beetle Epitrix subcrinita, Tuber Flea Beetle Epitrix tuberis

Pacific Northwest Insect Management Handbook. Chapter: Irish Potatoes, Section: Flea Beetle to Grasshopper.

Vegetables: Pepper, Eggplant: Flea beetles. Washington State University Hortsense.

See Diseases, pests, and other problems common to many vegetables: Flea beetle.
 

Common name (of damaging stage): Tomato hornworm
Latin binomial: Manduca quinquemaculata
Host crops: Pepper, eggplant, potato, and tomato.

Photo of mature tomato hornworm Photo of tomato hornworm Photo of tomato hornworm on ground Photo of tomato hornworm adult
Mature tomato hornworms can reach 3 inches long. They come in various hues of green to gray, but are distinguished from other hornworms by the eight v-shaped stripes running along the length of their bodies and a black horn on their rear end. The coloration allows these large caterpillars to remain cryptic within the canopy of tomato plants. Tomato hornworm is a plant defoliator feeding on entire leaves, small stems, and even parts of immature fruit. Often this defoliation is first noticed near the end of the growing season (August or early September) when the hornworm is approaching maturity. The tomato hornworm has one generation per year and overwinters as a pupa in the soil. Adults will emerge in the spring. The tomato hornworm adult is a large (3.5 to 5.25-inch wingspan) moth known as the five-spotted hawk moth for the five pairs of orange spots on the abdomen. The adult is rarely encountered by growers and home gardeners as it tends to fly around dusk.
Photo Source: Michael Bush, WSU Extension, Yakima, WA

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.
 

Parasitic Plants

Common name: Field dodder
Latin binomial: Cuscuta spp.
Host Crops: Bean, beet, carrot, onion, pepper, potato, tomato, and many other crops (not only vegetables)

Photo of field dodder on pepper Photo of field dodder on pepper Photo of field dodder on pepper Photo of field dodder on pepper
Field dodder is a plant species that is parasitic on many crops. Field dodder produces clusters of small whitish flowers and seed capsules. Dodder will attach itself directly to the host plant, making it impossible to disengage the parasitic plant from the host plant. Recognized by the orange to yellowish, string-like stems that intertwine with host plants. The field dodder “net” can completely envelope, smother and kill crops.
Photo Source: Michael Bush, WSU Extension, Yakima, WA

On-Line Resources:

See Diseases, pests, and other problems common to many vegetables: Field dodder.
 

Abiotic Problems Common to Pepper

Problem: Blossom end rot
Cause: Calcium deficiency resulting from various environmental conditions and management practices, e.g., inadequate Ca in the soil, inconsistent water as a result of alternating wet and dry periods that decrease Ca uptake by plants, and even excellent growing conditions such as a period of very bright sunshine and warm temperatures mid-season.
Crops affected: Tomato, pepper, eggplant, and various cucurbits.

Photo of symptoms of blossom end rot on pepper Photo of symptoms of blossom end rot on tomato fruit Photo of blossom end rot stymptoms on tomato
Blossom-end rot is a physiological disorder that first appears as a water-soaked, light brown spot on the distil end of the fruit. As the fruit matures, the spot becomes sunken, leathery, and brown to black. Secondary pathogens can infect the area, causing fruit rot. The disorder is more common on earliest maturing fruit. Blossom end rot is associated with a low concentration of calcium in developing fruit. In eastern Washington, this is often caused by excessive soil moisture fluctuations, drought stress, or excessive nitrogen fertilization. Soil surface mulches, appropriate irrigation timing and frequency, soil amendment with limestone, and foliar applications of calcium may reduce the incidence of this disorder. Symptoms of blossom end rot on tomato fruit.
Photo Source: Mike Bush, WSU Yakima Co. Extension Educator Photo Source: Krishna Mohan, University of Idaho

On-Line Resources:

Blossom-End Rot of Tomato, Pepper, and Eggplant. By Miller, S.A., R. C. Rowe, and R. M. Riedel, The Ohio State University Extension Fact Sheet HYG-3117-96.

Blossom end rot: Understanding a perennial problem. Michigan State University Extension.

See Diseases, pests, and other problems common to many vegetables: Blossom end rot of vegetables.


 

Problem: Vivipary (germination of seeds while still attached to the mother plant)
Crops affected: Solanaceaous vegetables like tomato and pepper.

Photo of symptoms of vivipary of tomato
This atypical tomato developed a dark discoloration just under the skin of the ripe fruit. When cut open, seeds within the tomato fruit were germinating. This physiological disorder is known as vivipary, where the seeds germinate while still in the fruit. It is suspected to be caused by plant stress such as drought, water stress, or potassium deficiency within the fruit. The fruit are still edible.
Photo Source: Michael Bush, Washington State University Extension, Yakima, WA

On-Line Resources:

Effect of potassium nutrition during bell pepper seed development on vivipary and endogenous levels of abscisic acid (ABA).. By Marrush, M., M. Yamaguchi and M. E. Saltveit. 1998. J. Amer. Soc. Hort. Sci. 123(5):925–930.

Physiological and Nutrient Disorders. University of Kentucky Vegetable Integrated Pest Management Program. Vegetable Manuals.

See Diseases, pests, and other problems common to many vegetables: Vivipary.


 
 

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