ISSUE 8   July 1, 2010

NDSU PLANT DIAGNOSTIC LAB UPDATE

Diagnoses (by county) for North Dakota samples completed during this time are summarized in the table below:

County

Host

Diagnosis

Cass

American Plum (Prunus americana)

Insect Damage

Grand Forks

Ash (Fraxinus sp.)

Environmental stress

Bottineau

Barley (Hordeum vulgare)

Nitrogen Deficiency (4 instances)

Cass

Linden (Tilia sp.)

Cottony Maple Scale (Pulvinaria innumerabilis)

Richland

Blue Spruce (Picea pungens)

Environmental stress

Richland

Blue Spruce (Picea pungens)

Spruce Needleminers (Epinotia sp)

Richland

Blue Spruce (Picea pungens)

Winter Injury

Traill

Kentucky Bluegrass (Poa pratensis)

Unknown

Mchenry

Bur Oak (Quercus macropcarpa)

Anthracnose (Discula quercina)

Richland

Corn (Zea mays)

Chemical Injury

Ward

Crabapple (Malus sp.)

Mechanical Damage

Steele

Apple (Malus domestica)

Apple Black Rot (Botryosphaeri obtusa)

Cass

Apple (Malus domestica)

Cytospora Canker (Cytospora sp.)

Walsh

Dry Bean (Phaseolus vulgaris)

Chemical Injury

Cass

Pea (Pisum sativum)

Bean Leaf Roll Virus

Ward

Pea (Pisum sativum)

Pea Anthracnose (Colletotrichum pisi)

Cass

Pea (Pisum sativum)

Pea Mosaic Virus

Cass

Insect ID Request

Mourningcloak Butterfly (Nymphalis antiopa)

Cavalier

Maple (Acer sp.)

Growth Regulator Herbicide injury

Cass

Maple (Acer sp.)

Iron Chlorosis

Cass

Maple (Acer sp.)

Salt Damage

Cavalier

Mugo pine (Pinus mugo)

Normal Plant Growth (male cones)

La Moure

Plant ID Request

Helianthus sp.

Burleigh

Plant ID Request

Tall Fescue (Festuca arundinacea)

Richland

Ponderosa Pine (Pinus ponderosa)

Pine Tip Moth injury

Pierce

Potato (Solanum tuberosum)

Growth Regulator Effect

Hettinger

Quaking Aspen (Populus tremuloides)

Cultural problem

Ward

Juneberry (Amelanchier alnifolia)

Powdery Mildew (Podosphaera sp.)

Grand Forks

Scotch Pine (Pinus sylvestris)

Environmental stress

Richland

Sugar Beet (Beta vulgaris)

Fusarium Yellows (Fusarium oxysporum)

Cass

Tatarian Maple (Acer tataricum)

Physiological leaf spot

Cass

Tomato (Lycopersicon esculentum)

Growth Regulator Herbicide injury

Kidder

Tomato (Lycopersicon esculentum)

Growth Regulator Herbicide injury

Stutsman

Tomato (Lycopersicon esculentum)

Nitrogen Deficiency

Cass

Turfgrass (mixed species)

Fairy Ring (various fungi)

The Great Plains Diagnostic Network continues to sponsor a small grains virus survey for 2010. Nine small grain samples were processed for this survey last Friday, and of these only one spring wheat sample (from Eddy county) tested positive for viruses (WSMV and HPV).

A final summary of North Dakota samples for this survey will be available in the last Crop and Pest Report issue for 2010.

Kasia Kinzer
NDSU Plant Diagnostician
Web: www.ag.ndsu.nodak.edu/diaglab
e-mail: kasia.kinzer@ndsu.edu
Telephone: 701-231-7854


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