ISSUE 8   July 3, 2008

UPDATE FROM THE NDSU PLANT DIAGNOSTIC LAB

The tables below summarize samples received and processed by the NDSU Plant Diagnostic Lab for the past week (June 25 through July 1, 2008).

Table 1. Number of Sample Submissions by Category.

Sample Category

# of samples

Field crops

19

Woody ornamental -Deciduous

11

Seed health/Phytosanitary

23

Woody ornamental - Evergreen

3

Perennial

1

Total

57

Table 2. Diagnoses by state, county, and host.

State-County

Host

Diagnosis

KS-Grove

Field Pea (Pisum sativum)

Foliar bacterial disease (Pseudomonas sp.)

KS-Unknown

Field Pea(Pisum sativum)

Foliar bacterial disease (Pseudomonas sp.)

MN-Polk

Sugar beet (Beta vulgaris altissima)

Fusarium root rot (Fusarium sp.)

MN-Polk

Sugar beet (Beta vulgaris altissima)

Rhizoctonia root rot (Rhizoctonia solani)

ND-Barnes

Corn (Zea mays)

Bacterial leaf spot (Pseudomonas sp.)

ND-Bottineau

Sunflower (Helianthus sp.)

Herbicide carryover suspected

ND-Cass

Blue spruce (Picea pungens)

Stigmina needle blight (Stigmina lautii)

ND-Cass

Blue spruce (Picea pungens)

Stigmina needle blight (Stigmina lautii)

ND-Cass

Blue spruce (Picea pungens)

Stigmina needle blight (Stigmina lautii)

ND-Cass

Durum wheat (Triticum turgidum)

Fusarium root rot (Fusarium sp.)

ND-Cass

Durum wheat (Triticum turgidum)

Common root rot (Bipolaris sorokiniana)

ND-Cass

Durum wheat (Triticum turgidum)

Pythium root rot (Pythium sp.)

ND-Cass

Elm (Ulmus species)

Squirrel damage

ND-Cass

Silver maple

Mechanical damage

ND-Foster

Elm (Ulmus species)

Scale insects (Order homoptera)

ND-Foster

Elm (Ulmus species)

Woolly elm aphid (Eriosoma americanum)

ND-Grand Forks

Apple (Malus domestica)

Plant bugs (Family Miridae)

ND-Griggs

Potato (Solanum tuberosum)

Herbicide injury

ND-Griggs

Potato(Solanum tuberosum)

Herbicide injury

ND-Cass

Corn (Zea mays)

Herbicide injury

ND-McLean

Blue spruce (Picea pungens)

Unknown abiotic disorder

ND-Morton

Wheat (Triticum species)

Drought stress damage

ND-Morton

Wheat (Triticum species)

Herbicide injury

ND-Mountrail

Scotch Pine (Pinus sylvestris)

Drought stress damage

ND-Mountrail

Spruce (Picea species)

Root injury

ND-Ramsey

Green Ash (Fraxinus pennsylvanica lanceolata)

Ash anthracnose (Gloeosporium aridum)

ND-Steele

Dry Bean (Phaseoulus vulgaris)

Herbicide injury

ND-Towner

Watermelon (Citrullus lanatus)

Heat canker

ND-Traill

Soybean (Glycine max)

Insufficient sample

ND-Walsh

Apple (Malus domestica)

Girdled branch

ND-Walsh

Apple (Malus domestica)

Frost injury (early season)

ND-Walsh

Siberian elm (Ulmus pumila)

Spring cankerworm (Paleacrita vernata)

ND-Walsh

Sugar beet (Beta vulgaris altissima)

Herbicide injury

ND-Wells

Linden (Tilia sp.)

Eriophyid mites (Family Eriophyidae)

SD-Dewey

Choke cherry (Prunus virginiana)

Herbicide injury

Kasia Kinzer
NDSU Plant Diagnostician
NDSU.PlantDiagnosticLab@ndsu.edu
701.231.7854
http://www.ag.ndsu.nodak.edu/diaglab/


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