5 articles tagged "Weed Management".

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…]


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.


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…]


​Some of the herbicides available for use on vegetables in Indiana are registered under a supplemental label or under a special local needs (SLN, 24(c)) registration. In these cases the instructions for use on vegetables are not on the main label that comes with the purchased product. For instance, in the Midwest Vegetable Production Guide, Dual Magnum® is listed as an option for watermelon, cantaloupe, and cucumber in Indiana and Ohio. The label on the herbicide container doesn’t list those crops. Neither does the main label available from a common online label site, www.cdms.net. This is because the product is registered for use on these crops under a special local needs (24(c)) registration. Anyone using the product should have on hand a copy of the label that provides specific instructions for use on the crop in question, in addition to the main label.  The 24(c) label in this example is[Read More…]


Driftwatch registry map with pin marking high tunnels at Pinney-Purdue Ag Center circled in yellow as an example.

​Vegetable, fruit, and organic farmers can register their production areas on Driftwatch.org to let commercial pesticide applicators know where the fields are. Beekeepers can also register sites where beehives are located. Once sites are registered and approved they appear on the Driftwatch registry map (see Fig. 1) and partnering applicators are notified. This helps applicators reduce drift or accidental application to vegetable crops.  Registration is free and easy. Why not do it today? Visit Fieldwatch.com to find the user guide with instructions.  If you registered fields last year you will need to renew the sites in order for them to show up in the registry this year. When renewing, it isn’t necessary to reenter all the information, just what has changed for 2015. Instructions for renewal are also online.


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