ISSUE 12   July 29, 2010

NDSU PLANT DIAGNOSTIC LAB UPDATE

      The NDSU Plant Diagnostic Lab processed 137 samples from July 21 through July 28. Of these, 98 were for routine diagnosis, 31 were for phytosanitary testing, and 3 were for research. Diagnoses (by county) for North Dakota samples completed during this time are summarized in the table below:

County

Host

Diagnosis

Burleigh

Tomato (Lycopersicon esculentum)

Herbicide Injury

Burleigh

Spruce (Picea sp.)

Spruce Gall Midge (Mayetiola piceae)

Burleigh

Spruce - Blue (Picea pungens)

Spruce Needleminer (Endothenia albolineana)

Cass

Apple (Malus domestica)

Apple Black Rot (Botryosphaeria obtusa)

Cass

Plant ID Request

Blue mustard (Chorispora tenelia)

Cass

Dry Bean (Phaseolus vulgaris)

Chemical Injury (2 instances)

Cass

Maple (Acer sp.)

Cottony Maple Scale (Pulvinaria innumerabilis)

Cass

Buckthorn (ornamental) (Rhamnus sp.)

Oat crown rust (Puccinia coronata)

Cass

Turfgrass (mixed species)

Dense shade

Cass

Elm - American (Ulmus americana)

Dutch Elm Disease (Ophiostoma ulmi)

Cass

Potato (Solanum tuberosum)

Fusarium Dry Rot (Fusarium sp.)

Cass

Soybean (Glycine max)

Herbicide Injury (2 instances)

Cass

Maple (Acer sp.)

Iron Deficiency

Cass

Birch - River (Betula nigra)

Nutrient Imbalance

Cass

Potato (Solanum tuberosum)

Potato Black Heart (Abiotic disorder)

Cass

Turfgrass (mixed species)

Powdery Mildew (Erysiphe sp.)

Cass

Barley (Hordeum vulgare)

Powdery Mildew (Blumeria graminis f.sp. hordei)

Cavalier

Wheat - Spring (Triticum aestivum)

Bacterial Leaf Streak (Xanthomonas translucens)

Cavalier

Insect ID Request

Poplar Borer (Saperda calcarata)

Foster

Plant ID Request

Western Sticktight (Lappula occidentalis)

Golden Valley

Lentil (Lens culinaris)

Nutrient Imbalance

Grand Forks

Soybean (Glycine max)

Herbicide Injury (3 instances)

Grand Forks

Maple (Acer sp.)

Iron Deficiency

Grand Forks

Maple (Acer sp.)

Nitrogen Deficiency

Grand Forks

Ohio Buckeye (Aesculus glabra)

Physiological scorch

Grand Forks

Tomato (Lycopersicon esculentum)

Bacterial Spot (Xanthomonas campestris)

Griggs

Tomato (Lycopersicon esculentum)

Herbicide Injury

Kidder

Barley (Hordeum vulgare)

Physiological Leaf Spot

Logan

Birch (Betula sp.)

Cultural/Environmental Problem

Mclean

Juneberry (Amelanchler alnifolia)

Herbicide Injury

Mclean

Caragana (Caragana sp.)

Herbicide Injury

Morton

Clematis (Clematis sp.)

Environmental Stress

Morton

Oak (Quercus sp.)

Phytotoxicity

Morton

Spruce - Blue (Picea pungens)

Spruce Gall Midge (Mayetiola piceae)

Pembina

Dry Bean (Phaseolus vulgaris)

Fusarium Root Rot (Fusarium solani)

Ramsey

Barley (Hordeum vulgare)

Chemical Injury

Ramsey

Elm - American (Ulmus americana)

Dutch Elm Disease (Ophiostoma ulmi)

Ransom

Apple (Malus domestica)

Fire Blight (Erwinia amylovora)

Richland

Sugar Beet (Beta vulgaris)

Fusarium Wilt (Fusarium oxysporum)

Richland

Sugar Beet (Beta vulgaris)

Rhizoctonia Root Rot (Rhizoctonia sp.) (3 instances)

Stark

Wheat - Spring (Triticum aestivum)

Wheat Streak Mosaic Virus

Stark

Pine - Ponderosa (Pinus ponderosa)

Zimmerman Pine Moth (Dioryctria zimmermani)

Stutsman

Petunia (Petunia sp. Hybrids)

Cultural/Environmental Problem

Stutsman

Zucchini (Cucurbita pepo melopepo)

Insect Damage (2 instances)

Traill

Sunflower (Helianthus annuus)

Downy Mildew (Plasmopara halstedii)

Walsh

Spruce (Picea sp.)

Environmental Stress (2 instances)

Ward

Canola (Brassica napus)

Black leg (Leptosphaeria maculans)

Ward

Sunflower (Helianthus annuus)

Fusarium Wilt (Fusarium oxysporum)

Ward

Canola (Brassica napus)

Insect Damage

Ward

Pea (Pisum sativum)

Rhizoctonia Root Rot (Rhizoctonia sp.)

Ward

Wheat - Spring (Triticum aestivum)

Wheat Streak Mosaic Virus (3 instances)

 

2010 WHEAT VIRUS SURVEY

The Great Plains Diagnostic Network continues to sponsor a small grains virus survey for 2010. Three samples were tested as part of this survey from July 21 through July 28. Only one sample tested positive for wheat streak mosaic virus (Wells county). None of the other viruses in the survey were detected in these samples. The wheat virus survey testing is expected to slow significantly as harvesting ramps up.

NOTE: We are tentatively planning to finish all wheat virus testing by August 13, so any samples for wheat virus testing should be received by August 11 (allow adequate time for shipping usually 2-3 business days). 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
www.ag.ndsu.nodak.edu/diaglab
kasia.kinzer@ndsu.edu


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