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Plant Diseases

Title Summary Date ID Author(s)
Actigard May Reduce Disease in Strawberry

One of the biggest problems facing strawberry production in Virginia is disease management.

Jul 14, 2009 2906-1330
Angular Leaf Spot of Cucumber May 1, 2009 450-700
Anthracnose - A Fungal Disease of Shade Trees May 1, 2009 450-604
Anthracnose on Snap Beans Jan 29, 2014 450-719 (PPWS-26NP)
Applied Research On Field Crop Disease Control 2004 May 1, 2009 450-564
Applied Research On Field Crop Disease Control 2005 May 1, 2009 450-564-05
Applied Research On Field Crop Disease Control 2006 Apr 28, 2009 424-236
Applied Research on Field Crop Disease Control 2007 May 1, 2009 2808-1005
Applied Research on Field Crop Disease Control 2008

Cool temperatures and rainfall delayed planting of cotton and peanut until after 20 April in Virginia. Thereafter, rainfall was widely scattered and soil temperatures averaged above 60 ºF which allowed planting to proceed in a timely manner. Most crops showed good emergence after planting throughout Eastern Virginia, except for some stand losses in early plantings of corn.

May 14, 2009 2905-1294
Applied Research on Field Crop Disease Control 2011 Feb 1, 2012 AREC-12
Applied Research on Field Crop Disease Control 2013 Feb 1, 2012 AREC-12
Asian Soybean Rust - Frequently Asked Questions I: Background and General Information May 1, 2009 450-301
Asian Soybean Rust - Frequently Asked Questions II: Identification, Biology, and Ecology May 1, 2009 450-302
Asian Soybean Rust - Frequently Asked Questions III: Control with Fungicides May 1, 2009 450-303
Asian Soybean Rust - Frequently Asked Questions IV: Cropping Systems and Cultural Practices May 1, 2009 450-304
Asian Soybean Rust - Frequently Asked Questions V: Monitoring, Tracking, and Scouting May 1, 2009 450-305
Asian Soybean Rust - Frequently Asked Questions VI: Sprayer and Nozzle Technology May 1, 2009 450-306
Azalea Leaf and Flower Gall May 1, 2009 450-605
Bacterial Leaf Scorch of Landscape Trees Jan 11, 2010 3001-1433
Bacterial Spot of Pepper May 1, 2009 450-702
Bean Pod Mottle Virus in Virginia Soybeans Sep 9, 2010 3009-1461
Black Root Rot of Japanese Holly May 1, 2009 450-606
Blossom End Rot of Tomato May 1, 2009 450-703
Botryosphaeria Canker and Dieback of Trees and Shrubs in the Landscape Jun 18, 2009 450-726
Botrytis Blight of Peony May 1, 2009 450-602
Boxwood Blight: A New Disease of Boxwood Found in the Eastern U.S. Jan 5, 2012 PPWS-4
Brown Rot on Peach and Other Stone Fruits May 1, 2009 450-721
Buckeye Rot of Tomato May 1, 2009 450-704
Clubroot of Crucifers May 1, 2009 450-705
Common Diseases of Soybean in the Mid-Atlantic Region

Common diseases of soybean are caused by viruses, bacteria, fungi and nematodes. Some diseases are spread by insect vectors and nematodes while others are spread by wind, splashing rain, or movement in soil. The best way to determine if disease control would be profitable is to first identify the diseases that are capable of causing  conomic yield losses. Symptoms of disease include plant damage caused by a pathogen and the reaction of plants to infection. Signs are the visible evidence of the pathogen. Some diseases have characteristic symptoms and signs that are identifiable in the field.

Feb 17, 2010 3001-1435
Comparison of Yield, Maturity, Value and Susceptibility to TSWV in Virginia- and Runner-type Varieties of Peanut in 2004 May 1, 2009 450-567
Corn Smut May 1, 2009 450-706
Crown Gall of Woody Ornamentals May 1, 2009 450-608
Downy Mildew in Cucurbits: Occurence of QOI Resistance in the USA and Impact on Managing Disease

Strains of the cucurbit downy mildew fungus resistant to QoI (also known as strobilurin) fungicides were detected in GA and NC in fall 2004 and in FL in spring 2005. The genetic mutation detected is the same as that in QoI-resistant cucurbit powdery mildew fungal strains.

Aug 12, 2009 2906-1385
Downy Mildew of Cucurbits May 1, 2009 450-707
Early Blight of Tomatoes May 1, 2009 450-708
Entomosporium Leaf Spot of Photinia May 1, 2009 450-609
Fire Blight of Ornamentals May 1, 2009 450-610
Fire or Botrytis Blight of Tulip May 1, 2009 450-607
Foliar Diseases of Dogwood May 1, 2009 450-611
Fusarium Wilt of Mimosa (Albizia julibrissin)

Fusarium wilt is a common and lethal disease of mimosa (Albizia julibrissin)1, also commonly known as silktree. In the United States this disease occurs in the east from New York southward and also in Louisiana, Arkansas and California. Fusarium wilt is caused by the fungus Fusarium oxysporum forma specialis perniciosum. This pathogen causes Fusarium wilt on Albizia species and also on tree-ofheaven (Ailanthus altissima). Fusarium oxysporum f. sp. perniciosum colonizes and clogs the tree's vascular (water-conducting) tissue, and interferes with the movement of plant sap. This results in relatively rapid tree death.

May 1, 2009 2811-1020
Gray Leaf Spot Disease of Corn May 1, 2009 450-612
Hollyhock Rust May 1, 2009 450-613
Impact of Cotton Monoculture, Variety Selection, and Chemical Inputs on Disease Control, 2011 Jan 27, 2012 AREC-13
Iris Leaf Spot May 1, 2009 450-600
Juniper Tip Blights May 1, 2009 450-601
Late Blight of Tomato and Potato Jan 20, 2012 ANR-6
Managing Fusarium Head Blight in Virginia Small Grains

Fusarium head blight (FHB), or scab, continues to impact small grain crops grown in Virginia. Caused primarily by the fungus Fusarium graminearum (also known as Gibberella zeae), this disease can negatively impact yield and grain quality. Grain may also contain toxins (mycotoxins) produced by the fungus and reduce the price received for grain at local mills and elevators. Corn and small grain residues remaining in the field prior to small grain planting are known to provide a place for the fungus
to overwinter and proliferate during favorable environmental conditions.

Mar 4, 2011 3102-1535
Pest Management Guide: Field Crops, 2014 Feb 3, 2014 456-016 (ENTO-37P)
Pest Management Guide: Horticultural and Forest Crops, 2014 Jan 28, 2014 456-017 (ENTO-38P)
Phytophthora Root Rot of Rhododendron and Azalea May 1, 2009 450-615
Plectosporium Blight of Cucurbits May 1, 2009 450-709
Powdery Mildew of Cucurbits May 1, 2009 450-710
Powdery Mildew of Ornamental Plants May 1, 2009 450-603
Powdery Mildew-Resistant Woody Ornamentals May 1, 2009 450-616
Problem-free Shrubs for Virginia Landscapes May 1, 2009 450-236
Problem-free Trees for Virginia Landscapes May 1, 2009 450-237
Reducing Pesticide Use in the Home Lawn and Garden May 1, 2009 450-725
Rose Rosette Disease Sep 17, 2012 450-620 (PPWS-10P)
Selected Vegetable Diseases

A table of plant diseases.

May 1, 2009 426-363
Septoria Leaf Spot of Tomato May 1, 2009 450-711
Sooty Mold of Conifers and Hardwoods May 1, 2009 450-618
Sorghum (Sorghum vulgare, L.) Diseases Head mold

The purpose of this publication is to provide performance data of the many soybean varieties offered for sale in Virginia.  These data should be of benefit to producers and agribusinesses in making selections of varieties for their use.  It is realized that not all varieties that are offered for sale in Virginia are included in these tests.  There is no implication that varieties not included are inferior in any way, but only that they have not been tested. 

Aug 21, 2012 AREC-20NP
Sorghum (Sorghum vulgare, L.) Insects Corn earworm [Helicoverpa zea (Boddie)]

The purpose of this publication is to provide performance data of the many soybean varieties offered for sale in Virginia.  These data should be of benefit to producers and agribusinesses in making selections of varieties for their use.  It is realized that not all varieties that are offered for sale in Virginia are included in these tests.  There is no implication that varieties not included are inferior in any way, but only that they have not been tested. 

Aug 31, 2012 AREC-21NP
Soybean Disease Control: Response of Soybeans to Foliar Sprays of Fungicides in 2005 May 1, 2009 450-561
Soybean Rust Incidence and the Response of Soybeans to Foliar Fungicides in 2006 May 1, 2009 450-562
Soybean Rust Incidence and the Response of Soybeans to Fungicides in 2009 Dec 21, 2010 3012-1520
Strawberry Anthracnose Ripe Fruit Rot and Management Recommendations

Anthracnose symptoms on ripe strawberry fruit include typical sunken and round lesions with an orange discoloration within the lesion and brown spots on green fruit.

Jul 23, 2009 2906-1323
Successful No-Tillage Corn Production Jul 29, 2009 424-030
Timber Rot of Tomato May 1, 2009 450-712
Troubleshooting The Soybean Crop Nov 16, 2012 AREC-25NP
Use of In-furrow Fungicide Treatments and Seedpiece Dusts for Disease Control in White Potato

On the Eastern Shore of Virginia, potato growers plant potatoes in early spring for summer harvest. Fungicide dusts have been typically used to protect the potato seedpiece from infection when planted in cool, wet soil in the early spring.

Aug 18, 2009 2906-1394
Verticillium Wilt of Shade Trees May 1, 2009 450-619
Virginia Master Naturalist, Basic Training Course, Botany Feb 6, 2014 ANR-10NP (ANR-97NP)
Virginia Master Naturalist, Basic Training Course, Botany (Introductory Version) Jan 31, 2014 ANR-12NP
Winter Injury and Cool Temperatures Create Ideal Conditions for Botrytis in Strawberries*

Winter injury has left many dead leaves that will serve as a major source of Botrytis spores in the early spring season. Likewise, a number of plantings recently experienced freeze injury to emerged blooms. These dead flowers can become infected with Botrytis; the pathogen can grow down the peduncle and into the upper crown tissue to cause a Botrytis crown rot.

Aug 18, 2009 2906-1395
Wire Stem and Bottom Rot of Cabbage May 1, 2009 450-713