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12 articles tagged "Weed Management".

A Look at the New Closed Transfer System for Paraquat-Containing Herbicides

March 16, 2020 - From Issue:
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In the October 2019 issue of the Vegetable Crops Hotline, I referenced the new regulatory changes to herbicides containing the active ingredient paraquat. One of the new requirements is for closed system packaging. To quote the Environmental Protection Agency (EPA): “New closed-system packaging (is) designed to prevent transfer or removal of the pesticide except directly into proper application equipment. This will prevent spills, mixing or pouring the pesticide into other containers or other actions that could lead to paraquat exposure.” Earlier this month I had a chance to see one of the ways chemical companies are complying with the new regulation. At the Weed Science Society of American Annual Meeting, Syngenta presented their closed packaging and transfer system. It contains a closed system cap that cannot be removed or opened by hand (Figures 1 and 2). In order to remove herbicide from the container, the cap must be connected to an[Read More…]

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Weed Science Updates

October 21, 2019 - From Issue:
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As the production season winds down there are two weed-related news items that producers should be aware of: New Requirements for Users of Paraquat Herbicide.  Paraquat dichloride is the active ingredient in products such as Gramoxone®, Devour®, Cyclone®, and Quik-Quat®. Earlier this year the Environmental Protection Agency (EPA) announced the following changes to paraquat requirements: Additional labeling requirements and the distribution of supplemental warning materials at the point-of-purchase are now required and highlight the toxicity and risks associated with paraquat products. Paraquat use is now restricted to certified applicators only. No longer can an uncertified handler use paraquat, even under the direct supervision of a certified applicator. Specialized, approved paraquat training is now required for anyone who will mix, load, apply, or handle paraquat. New, closed-system packaging will be used to prevent the transfer or removal of paraquat into unapproved containers or equipment. These changes were sparked by unnecessary deaths[Read More…]

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Dual Magnum Indiana 24C Label Amended to Include More Crops

March 19, 2019 - From Issue:
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Dual Magnum® has had a special local needs (24C) label in Indiana for use on transplanted bell peppers and other vegetables for a number of years. Last week the label was amended to include additional small fruit and vegetable crops, including asparagus. The new 24C label is available on the National Pesticide Information Retrieval System web site: http://npirspublic.ceris.purdue.edu/state/state_menu.aspx?state=IN. To find it, type “SLN IN” and “130003” in the first two boxes for “EPA Registration Number” and click the search button. The product report will show  “DUAL MAGNUM – TRANSPLANTED BELL PEPPERS.” Click on the ALLSTAR symbol. On the page that opens, click on the Company Label ID number “IN0816048DA0319.” This will open a pdf of the label. If you decide to use the product, carefully read and follow the label instructions.

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Videos on Mechanical Weed Control

May 24, 2018 - From Issue:

Three videos on in-row weeding tools (Finger weeder, Torsion weeder, Tine harrow) were developed at the Michigan State University Department of Horticulture. Each video is 20 minutes: introduces the tool, how it works, different models, show adjusting the tool in the field, and a short interview with a farmer who uses the tool. These videos can be accessed at the MSU Mechanical Weed Control Channel https://www.youtube.com/channel/UCH-k889oYbUaEznvgiDtrOQ

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Chateau Herbicide for Use in Melon Production

May 10, 2018 - From Issue:
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This article provides more detailed information about this herbicide. How does Chateau® herbicide work Chateau® is a group 14 mode-of-action herbicide. Compounds in this group are most active on broadleaf weeds. Before Chateau® became available,  no other preemergence herbicide with the same mode of action was labeled for use in watermelons and cantaloupes. The active ingredient of Chateau® herbicide, flumioxazin, controls susceptible weeds by inhibiting propoporphyrinogen oxidase (PPO), an enzyme that controls chlorophyll synthesis. Because of chlorophyll production inhibition, a chain reaction occurs within the plant that causes cell membrane disruption. Chateau® herbicide can assist in the postemergence control of emerged weeds. It is taken up by roots, stems, or leaves of young plants. It kills weeds through direct contact. There is usually little or no translocation of the herbicide within plants. Foliage necrosis can be observed after 4 to 6 hours of sunlight following the herbicide application. Susceptible plants[Read More…]

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Chateau Herbicide SW 24(c) label

May 1, 2018 - From Issue:
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Chateau SW® herbicide now has a 24(c) special local needs label for cucurbits. This product is produced by Valent, but the label is held by the Indiana Vegetable Growers Association (IVGA).  To obtain a label, one must be a member of the IVGA, pay an annual $100 processing fee, read and understand the ‘conditions for use’ and have the appropriate forms signed and notarized. One cannot use Chateau SW® without completing these forms and obtaining a label. This process must be repeated every year. Chateau® can only be used in row middles between raised plastic mulch beds that are 4 inches higher than the treated row middle. The mulched bed must be at least 24 inches wide. The application must be directed between rows with a shielded sprayer. Chateau® cannot be applied post-transplant. Do not apply more than 4 oz. of Chateau® per acre at a broadcast rate during a single application.[Read More…]

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Using Driftwatch/Fieldwatch to Help Dicamba Applicators Locate Sensitive Crops

February 16, 2018 - From Issue:
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On January 1, products containing >6.5% dicamba and an agriculture use label are now restricted use pesticides. In order to purchase these herbicides, buyers must carry a private or commercial pesticide applicator license. While dicamba herbicides have been on the market for over 50 years to control broadleaf weeds, the recent development of dicamba resistant soybeans has given soybean producers a new post-emergent option for the management of herbicide resistant weeds. The new soybeans are XtendiMax® soybeans and FeXapan®, XtendiMax®, or Engenia® herbicides, all dicamba-based products can be sprayed on them. Those producers who plan to apply any of the three soybean dicamba products MUST attend a training before any of these products are applied. This is a requirement mandated by the EPA approved label. These trainings cover basic drift reduction techniques, as well as label requirements. One requirement is before application of a soybean dicamba product; producers must visit[Read More…]

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Effectiveness of Preemergent Herbicides

June 22, 2017 - From Issue:
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Recent dry weather raises concern about effectiveness of preemergent herbicides.  Preemergent herbicides applied on the soil surface need to be moved into the soil where the target weed seeds are germinating (normally 1-2 inches deep) in order to be effective. The process normally requires 0.5 to 0.75 inch of water within a few days of herbicide application. For example, product labels state that Curbit 3EC® needs 0.5 inch of water within 5 days of application, and Dual Magnum® needs at least 0.5 inch water within 10 days of application. In nonirrigated areas where rain is not anticipated, a shallow cultivation is needed to move the herbicide into the zone of weed seed germination. Most areas of Indiana were dry the last week of May and first week of June. If preemergent herbicides were not incorporated in a timely manner by water or machine, unsatisfactory weed control might be observed. In that case,[Read More…]

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Kerb SC Labeled for Leaf Lettuce

April 11, 2016 - From Issue:
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U.S. EPA approved a supplemental label to use Kerb SC® herbicide in leaf lettuce. Kerb® is a selective herbicide for control of certain annual grasses and broadleaf weeds. It can be used in direct seeded or transplanted leaf lettuce. Application can be made before or after planting but must be made prior to weed emergence. It may be applied at the rate of 1.25 to 5.0 pints of product (0.5 to 2 lb active ingredient) per acre broadcast application. Depending on application rates, 25 to 55 days of preharvest intervals are required. Refer to the label for more application information http://www.cdms.net/ldat/ld9R3003.pdf.

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Status of Chateau Label in Indiana

April 11, 2016 - From Issue:
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The herbicide Chateau SW® is labeled for several vegetable crops including asparagus, mint, onion, and sweet potato. Recently, several growers asked Purdue University whether this product could be labeled in Indiana for cucurbit production. The answer is that Chateau® is not and will not be labeled for Indiana cucurbit production. We want to use this opportunity to explain why Chateau® will not be available for use by cucurbit growers in Indiana. The reason that the product Chateau® came to the attention of cucurbit growers in Indiana is that in other states Chateau® is available for use. These states include Florida and Georgia. The manner is which Chateau® is labeled in these other states is via third party indemnification. That is, the company that registers Chateau® makes an agreement with a grower’s organization in that state to limit liability for the registrant, Valent U.S.A. Valent U.S.A. has stated that they will[Read More…]

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