ISSUE  13   August 12, 2010

NDSU PLANT DIAGNOSTIC LAB UPDATE

The NDSU Plant Diagnostic Lab processed 114 samples from August 4 through August 11. Of these, 34 were for routine diagnosis, 72 were for phytosanitary testing, and 8 were included in the wheat virus survey. Diagnoses (by county) for North Dakota samples completed during this time are summarized in the table below:

COUNTY

Host

HOST/HABITAT TAXONOMIC NAME

DIAGNOSIS/ID COMMON NAME

Mercer

Ash (Fraxinus sp.)

Fraxinus sp./spp.

Ash Rust (Puccinia sparganioides)

Renville

Spruce - Blue (Picea pungens)

Picea pungens

Environmental/Chemical injury

Cass

Daylily (Hemerocallis sp.)

Hemerocallis sp./spp. hybrids

Insect Damage suspected

Traill

Dry Bean (Phaseolus vulgaris)

Phaseolus vulgaris var.

Common Bean Rust (Uromyces appendiculatus)

Golden Valley

Wheat - Durum (Triticum turgidum)

Triticum turgidum

Fusarium Root Rot (Fusarium sp.)

Golden Valley

Wheat - Durum (Triticum turgidum)

Triticum turgidum

Physiological leaf spot

Hettinger

Wheat - Durum (Triticum turgidum)

Triticum turgidum

Tan Spot (Dreschlera sp.)

Cass

Elm - American (Ulmus americana)

Ulmus sp./spp.

Canker (Botryodiplodia hydrodermia)

Wells

Geranium (Pelargonium sp.)

Pelargonium sp./spp.

Pythium Root Rot (Pythium sp.)

Richland

Lilac (Syringa sp.)

Syringa sp./spp.

Bacterial Blight (Pseudomonas syringae)

Ward

Maple (Acer sp.)

Acer sp./spp.

Poor Growing Conditions

Lamoure

Plant ID Request

general

Devil's beggartick

Ramsey

Plant ID Request

general

Asteraceae family

Cavalier

Plant ID Request

general

Hairy galinsoga (Galinsoga ciliata)

Ramsey

Plant ID Request

general

Lambsquarters (Chenopodium album)

Cass

Plant ID Request

general

Pennsylvania Pellitory (Parietaria pensylvanica)

Ramsey

Plant ID Request

general

Galium sp.

Grant

Aspen - Quaking (Populus tremuloides)

Populus tremuloides

Trunk Girdling

Cavalier

Canola (Brassica napus)

Brassica napus var. napus

Herbicide injury

Burleigh

Wheat - Spring (Triticum aestivum)

Triticum aestivum

Root Rot (Bipolaris sororkiniana)

Cass

Basil (Ocimum basilicum)

Ocimum basilicum

Insect Damage

Cass

Basil (Ocimum basilicum)

Ocimum basilicum

Wind Damage

Grand Forks

Turfgrass (mixed species)

Turfgrass mixed species

Dense Thatch Layer

Burleigh

Turfgrass (mixed species)

Turfgrass mixed species

Cultural/Environmental Problem

Burleigh

Turfgrass (mixed species)

Turfgrass mixed species

Insufficient Light

Grand Forks

 Turfgrass (mixed species)

Turfgrass mixed species

Patch Disease (various root fungi)

 

2010 WHEAT VIRUS SURVEY

The Great Plains Diagnostic Network continues to sponsor a small grains virus survey for 2010. Eight samples were tested as part of this survey from July 21 through July 28. Three of these tested positive for wheat streak mosaic virus (counties: Benson, Cavalier, and Golden Valley). None of the other viruses in the survey were detected in these samples. All testing for the wheat virus survey will be completed this week. Final results will be compiled and made available in the last issue of the 2010 Crop and Pest Report.

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


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