Resources for Weeds

Title Available As Summary Date ID Author
Prevention and Control of Palmer Amaranth in Cotton
Palmer amaranth (Amaranthus palmeri), a member of the "pigweed" family, is one of the most troublesome weeds in many southern row crops. Seed can germinate all season and plants can grow to over 6 feet in height. Plants have either male flowers that shed pollen or female flowers that can produce up to 600,000 seed per plant. One Palmer amaranth per 30 foot of row can reduce cotton yield by 6 to 12%.
Mar 25, 2015 2805-1001 (PPWS-60NP)
Prevention and Control of Palmer Amaranth in Soybean
Palmer amaranth (Amaranthus palmeri), a member of the "pigweed" family, is one of the most troublesome weeds in many southern row crops. Seed can germinate all season and plants can grow to over 6 feet in height. Plants have either male flowers that shed pollen or female flowers that can produce up to 600,000 seed per plant. One Palmer amaranth per meter of row can reduce soybean yield 32%.
Jun 1, 2016 2808-1006 (PPWS-78NP)
Weed Management in Small Fruit Crops Jul 24, 2009 2906-1327
Weed Management Update in Small Fruit Jul 24, 2009 2906-1328
Palmer Amaranth Control in Cotton: 2008 & 2009 Efficacy Experiments Dec 22, 2009 2912-1428
Palmer Amaranth Control in Soybean: 2009 Efficacy Experiments Dec 22, 2009 2912-1429
Green Stem Syndrome in Soybean Dec 22, 2009 2912-1430
Water Garden Plants Sep 29, 2011 3109-1594
Fertilizing Cool-Season Forages with Poultry Litter versus Commercial Fertilizer Sep 16, 2009 418-142
The Nutritive Value of Common Pasture Weeds and Their Relation to Livestock Nutrient Requirements Aug 6, 2009 418-150
Successful No-Tillage Corn Production Jul 29, 2009 424-030
Poison Ivy: Leaves of three? Let it be! May 1, 2009 426-109
Identification and Control of Annual Ryegrass in No-Till Corn in Virginia May 1, 2009 427-001
Control of Common Pasture and Hayfield Weeds in Virginia and West Virginia May 1, 2009 427-002
Itchgrass Identification and Control in Virginia May 1, 2009 427-008
Identification and Control of Common Reed (Phragmites australis) in Virginia May 1, 2009 427-101
Lawn Moss: Friend or Foe? May 1, 2009 430-536
Identification and Control of Honeyvine Milkweed (Ampelamus albidus (Nutt.) Britt.) in Virginia
A perennial with slender, twining stems that may reach 10 feet in length.
May 1, 2009 450-139
Identification and Control of Hemp Dogbane (Apocynum cannabinum L.) in Virginia May 1, 2009 450-140
Identification and Control of Mugwort (Artemisia vulgaris L.) in Virginia
Perennial weed with persistent rhizomes that may be spread or transported by cultivation equipment or also in burlaped nursery stock infested with rhizomes.
May 1, 2009 450-141
Identification and Control of Horsenettle (Solanum carolinense L.) in Virginia
A perennial from rhizomes with conspicuous spines on leaves and stems reaching 3 feet in height.
May 1, 2009 450-142
Identification and Control of Trumpetcreeper (Campsis radicans (L.) Seem ex Bureau) in Virginia
Perennial woody vine that may reach 40 feet or more in length.
May 1, 2009 450-143
Pest Management Guide: Field Crops, 2017 Feb 17, 2017 456-016 (ENTO-221P)
Pest Management Guide: Horticultural and Forest Crops, 2017 Feb 17, 2017 456-017 (ENTO-222P)
Virginia Master Naturalist, Basic Training Course, Botany
Plants can be defined as multicellular, photosynthetic organisms with reproductive structures that are more complex than single cells. By this definition, algae are not considered plants because they are either unicellular or their reproductive structures are essentially unicellular. Fungi, too, are excluded because they are not photosynthetic. At least 400 million years of diversification have resulted in a wide diversity of taxonomically distinct major groups of plants. Some of the most important groups of plants found in Virginia are described below.
Feb 6, 2014 ANR-10NP (ANR-97NP)
Weed Control in Hops
Because hops are long-lived perennials, controlling weeds near plants without causing injury can be challenging. Furthermore, empty spaces between rows can quickly become filled with weeds if left unmanaged. Growers therefore need a year-round weed management plan. An important part of that plan is identifying the common weeds at the site and understanding their life cycles. Once weeds have been identified, a management plan can be developed using cultural, chemical, or integrated approaches.
Mar 11, 2015 ANR-144NP
Sorghum (Sorghum vulgare, L.) Weed Control Nov 16, 2012 AREC-29NP
Sensor-Based, Variable-Rate Nitrogen Applications in Virginia
Variable-rate applications (VRA) of nitrogen (N) fertilizers are a new option to assist producers with real-time fertilizer rate decisions. Two commercially available systems that allow variable-rate nitrogen applications are GreenSeeker (Trimble Navigation Limited; www. ntechindustries.com/greenseeker-home.html) and the OptRx Crop Sensor (Ag Leader Technology; www. agleader.com/products/directcommand/optrx/). A discussion of the science behind these systems, potential economic benefits, and other methodologies to make VRA is discussed in Virginia Cooperative Extension publication 442-505, “Precision Farming Tools: Variable- Rate Application” (Grisso et al. 2011).
Aug 8, 2014 CSES-90P
Managing Troublesome Crop Weeds: Current Practices Jul 25, 2017 PPWS-101NP
Pesticide Applicator Manuals Nov 17, 2011 VTTP-2
Pyridine Herbicide Carryover: Causes and Precautions May 9, 2012 VTTP-6NP