Caparol labeled for dill in Michigan

New Special Local Needs label for preemergence and post-emergence weed control in dill.

The Michigan Department of Agriculture and Rural Development (MDARD) has approved a Special Local Needs label (Section 24c) for use of Caparol 4L on dill. Caparol 4L is a triazine herbicide which inhibits photosynthesis. It is considered to be a Photosystem II inhibitor (PS II inhibitor). It has preemergence and post-emergence activity on many annual broadleaves and grasses.

The label allows one preemergence or one post-emergence application on dill at 3.2 pt per acre (1.6 lb active ingredient per acre). Caparol controls most annual weeds at this rate. Caparol is weak against pineappleweed, mayweed and galinsoga. There also is some PS II inhibitor-resistant redroot pigweed and common purslane in Michigan. Caparol should be used in rotation with other labeled herbicides to avoid weed resistance and an increase in population of tolerant weeds.

There is a 30-day pre-harvest interval (PHI) for applications of Caparol on dill. Preemergence use on sand may delay dill emergence or thin the stand. Post-emergence applications may delay dill maturity. Do not apply to dill that is under water stress. Do not apply Caparol in a tank-mix with other pesticides to avoid foliar burn.

The Caparol label may be downloaded from

Dr. Zandstra’s work is funded in part by MSU’s AgBioResearch.

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