New herbicide label for Caparol on vegetable crops

Caparol labeled for carrot, celeriac, cilantro, okra, parsley, and rhubarb.

The EPA has issued a Section 3 Supplemental label for use of the herbicide Caparol (prometryn) on carrot, cilantro, celeriac, okra, parsley and rhubarb. Caparol is an excellent preemergence and postemergence herbicide that controls most broadleaves and small grasses. It is different chemically from Lorox (linuron), but has the same mode of action. There appears to be herbicide resistance to both herbicides in some fields, so growers should avoid using both herbicides continuously.

On carrot, Caparol may be applied preemergence or postemergence at the rate of 2 to 4 pints (1 to 2 lb ai) per acre. A maximum of three applications (8 pints) may be applied per acre. There is a 30-day preharvest interval. For postemergence applications, add nonionic surfactant at 0.5 percent or crop oil concentrate at 15 to 20 percent to the spray mix to improve burndown of yellow nutsedge and other tough and large weeds. Caparol can stunt carrot growth when applied pre or postemergence, so growers should use the low rate to gain experience with its use. Carrots normally outgrow the stunting, but maturity may be delayed three to five days.

On celeriac, make a single application of Caparol at 1.6 to 4 pints (0.8 to 2 lb ai) after the crop has developed six to eight leaves. There is a 60-day preharvest interval.

For cilantro, apply Caparol at 2 to 3.2 pints (1 to 1.6 lb ai) per acre after seeding and before emergence of cilantro. Use low rate on light soil; do not use on sand. There is a 30-day preharvest interval. Caparol can stunt and thin the stand of cilantro, so use a low rate to gain experience with the herbicide.

For parsley, apply Caparol at 1 pint (0.5 lb ai) per acre after seeding parsley and before emergence. A postemergence application of 1.0 pint may be applied up to 30 days before harvest. A third application of 1.0 pint may be made to regrowth up to 30 days before the second harvest.

The label may be printed from CDMS.net. Caparol is a Syngenta Crop Protection product.

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

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