ISSUE 7 June 24, 2010
NDSU PLANT DIAGNOSTIC LAB UPDATE
For June 9 through June 22, 2010, the Plant Diagnostic Lab processed 85 samples and applied 193 diagnoses. Twenty-three of these were submitted to fulfill phytosanitary requirements for export, 17 were included in the Great Plains Diagnostic Network small grain virus survey, and 48 were submitted for routine diagnosis/identification. 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 |
Mourning Cloak 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. Three winter wheat samples tested positive for wheat streak mosaic virus (Cavalier, Foster, and Stark counties); three winter wheat samples tested positive for barley yellow dwarf virus (all from Cavalier county); and one spring wheat sample tested positive for barley yellow dwarf virus (Stark county). Since the 2010 survey began through June 17, 53 samples have tested positive for wheat streak mosaic virus (5 of these were spring wheat), 15 for high plains virus (3 of these were spring wheat), and 9 for barley yellow dwarf virus (1 of these was spring wheat). Cereal yellow dwarf virus and Triticum mosaic virus have not yet been detected in North Dakota in 2010 as of June 17.
Kasia Kinzer
NDSU Plant Diagnostician
Web:
www.ag.ndsu.nodak.edu/diaglab
e-mail:
kasia.kinzer@ndsu.edu
Telephone: 701-231-7854
