ISSUE 12   July 20, 2006

PLANT DIAGNOSTIC LAB SUMMARY

Below is a summary of samples diagnosed from July 5-19, 2006 (excluding research samples and seed health testing results).

Host

Diagnosis

Taxonomic name

County

Ash

Anthracnose

Gloeosporium sp.

Traill

Barley

Bacterial Leaf Streak

Xanthomonas

Mountrail

Barley

Barley Yellow Dwarf Virus

Leuteovirus: (BYDV-PAV)

Mountrail

Beet; Sugar

Alternaria Blight

Alternaria sp.

Clay

Beet; Sugar

Glyphosate Injury possible

Abiotic pathology

Cass

Beet; Sugar

Herbicide Injury; Exposure

Abiotic pathology

Cass

Beet; Sugar

Nutrient Imbalance

Abiotic pathology

Cass

Beet; Sugar

Rhizoctonia Root Rot

Rhizoctonia sp.

Cass

Corn

Unknown

General

Otter Tail

Elm; American

Dutch Elm Disease

Ophiostoma ulmi

Mckenzie

Home and garden

Mold ID

Unidentified Dematiaceae

Cass

Insect Id request

Leaf Beetle

Galeruca rudis

Hettinger

Maple

Eriophyid Gall Mite

Eriophyes sp.

Cass

Maple

Maple Bladdergall Mite

Vasates quadripedes

Cass

Navy Bean

Zinc Deficiency

Abiotic pathology

Unknown

Plant ID request

Amaranths

Family Amaranthaceae

Cass, Richland

Plant ID request

Lambsquarters; Common

Chenopodium album

Richland

Plant ID request

Sedges

Family Cyperaceae

Dickey

Plant ID request

Wormwood; Biennial

Artemisia biennis

Richland

Poplar

Bacterial Wetwood

Enterobacter (Erwinia) possible

Cass

Purple Cornflower

Environmental Stress

Abiotic pathology

Cass

Soybean

Anthracnose

Colletotrichum truncatum

Cass

Soybean

Fusarium Root Rot

Fusarium sp.

Cass, Marshall, Norman

Soybean

Growth Regulator Effect

Abiotic pathology

Becker, Cass, Dickey, Richland, Stutsman

Soybean

Iron Deficiency

Abiotic pathology

Cass, Norman

Soybean

Rhizoctonia Root Rot

Rhizoctonia sp.

Cass

Spring Wheat

Glyphosate Injury possible

Abiotic pathology

Barnes, Cass, Grand Forks

Spring Wheat

Herbicide Injury; Exposure

Abiotic pathology

Hettinger

Spring Wheat

Wheat Streak Mosaic Virus

Potyviridae (WSMV)

Hettinger

Strawberry

Black root rot

Fusarium sp. and Pythium sp.

Clay

Strawberry

Winter Injury

Abiotic pathology

Clay

Sunflower

Glyphosate Injury possible

Abiotic pathology

Clay

Sunflower

Growth Regulator Effect

Abiotic pathology

Wells

Sunflower

Herbicide Injury; Exposure

Abiotic pathology

Cass, Hettinger, Towner, Wells

Tomato

Environmental Stress

Abiotic pathology

Morton

Tomato

Fusarium Wilt

Fusarium oxysporum possible

Dickey

Tomato

Growth Regulator Effect

Abiotic pathology

Dickey

Turfgrass

Stem rust

Puccinia graminis

Clay

Visually assessing symptoms of glyphosate injury can sometimes be nebulous. As a result, if you suspect glyphosate injury, you may want to consider submitting a sample to a lab that can analyze for this chemical or for certain plant byproducts as a result of exposure. The NDSU Plant Diagnostic Lab is unable to perform chemical analysis for glyphosate. However, if interest in this type of testing continues or increases, we may consider offering this type of testing in the future. Meanwhile, you can find a partial list of other labs that can perform chemical analysis at: www.ag.ndsu.nodak.edu/diaglab. The Olsen Biochem Lab at South Dakota State University is the closest lab, but there are other private labs listed as well that are in our region. Before sending a sample, I highly recommend that you call a lab to determine cost, how to collect and handle a sample, and how to ship it.

Kasia Kinzer
NDSU Plant Diagnostic Lab
701-231-7854


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