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Updated: November 15, 2021
Options for Postemergence Common Ragweed Control in Enlist E3 Soybean
In Maryland, populations of common ragweed have developed resistance to three herbicide groups, Group 9 (glyphosate), Group 2 (FirstRate, Synchrony), and Group 14 (Flexstar, Valor). These herbicide-resistant populations limit options for effective postemergence control. Even though alternative herbicides are available, control can be inconsistent when applied to common ragweed plants exceeding 4” tall (Figure 1).
Updated: September 3, 2021
Time to Pull Palmer Amaranth
Lately, I have seen several fields with Palmer amaranth flowers (Figure 1). It is imperative that these plants be managed before harvest (Palmer amaranth is listed as a noxious weed in Maryland and Delaware). At this point, mowing or herbicides will not improve yield nor prevent Palmer from germinating next year. Plants need to be physically removed from fields. Palmer amaranth has both male and female flowers on separate plants (Figure 2), and focus should be placed on removing the seed-producing females first. A single female can produce approximately 600,000 seeds per plant, and these seeds can remain viable for six years. Palmer seed matures within 2 weeks of flowering and if left unchecked, a single plant can infest an entire field within a few years (Figure 3).
Updated: September 1, 2021
The Stale Seedbed Technique: A Relatively Underused Alternative Weed Management Tactic for Vegetable Production
Weed management in vegetable cropping systems typically consists of crop rotation, manual weeding, weed mats, herbicides, and cultivation. Herbicide options in conventional and organically grown vegetables are limited because of infrequent registration of new herbicides and product loss due to regulatory actions. Further, vegetable crops are sensitive to many herbicides and this limits the number of products that can be safely applied.
Updated: September 1, 2021
Organic Weed Management in Weeds
Weed management is more challenging in organic crops and accounts for a large portion of production costs. As such, managing weeds is a major economic constraint to the organic vegetable industry, and comparisons of weed communities between conventional and organic farming systems consistently demonstrate higher weed levels in organic systems.
Updated: September 1, 2021
Organic Weed Control in No-Till Vegetable Systems
Organic vegetable growers have a hard time managing weeds, as there are no reliable Organic Materials Review Institute (OMRI) chemicals for controlling grass or broad leaf weeds. Most of the time growers depend on tillage for weed control, but excess tillage can lead to destruction of soil structure and the loss of carbon from the soil. No-tilling cover crops is a possibility, but has several problems, most notably being unreliable as a season-long weed control method.
Updated: September 1, 2021
Offing Cover Crops for Weed Suppression: Featuring the Roller Crimper and Other Mechanical Contraptions
Offing Cover Crops for Weed Suppression: Featuring the Roller Crimper and Other Mechanical Contraptions
Updated: September 1, 2021
Managing the Weed Seedbank with Cover Crops and Tillage
Weed control is a principal concern for vegetable growers. The adoption of sustainable agricultural techniques can reduce land managers' dependency on expensive or harmful chemicals, but may also result in increased weed presence. Weed control is not just a matter of preventing weed emergence or killing weeds that arise during the growing season. A good management strategy should include reducing the size of the existing weed seedbank. Adopting techniques that reduce the weed seedbank is a necessary step toward long term weed management solutions.
Updated: August 24, 2021
Stop Use Order for Some Labeled Organic Products
For our organic vegetable growers in the Mid-Atlantic the California Department of Food and Agriculture’s State Organic Program issued a STOP USE notice for W.O.W. (WHACK OUT WEEDS!) and ECOMIGHT-PRO products,manufactured by EcoMight LLC.
Updated: August 19, 2021
Herbicide Spray Tank Check Charts for Corn and Soybean
As planting gets underway, it is important to stay on top of our most troublesome weeds. In particular, marestail/horseweed, common ragweed, and Palmer amaranth. Below are two new charts to help determine the type of products to be included in the tank mix to best manage these weeds in corn and soybean.
Updated: June 3, 2021
Organic Weed Control in No-Till Vegetable Systems
Organic Weed Control in No-Till Vegetable Systems
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