Devrinol Crop Rotation Restrictions

13 years ago

We used Devrinol preemergent herbicide for tomatoes this year with fair results - but not really impressive enough to justify the crop rotation restrictions (12 mos for unlabelled crops and then only after deep plowing with a moldboard).

We want to plant brassica greens in that field now - only 7 mos after the herbicide application. Devrinol is labelled for heading brassicas (broc, caul & cabbage) only. We can't understand why leafing brassicas would not be tolerant as well - same family, etc ??? So I called the United Phosphorous customer service number and the rep said he could only go by the label, but couldn't think of any reason why leafy brssicas aren't included.

I would like to plant mustard, collards and turnips there on 9/15, gambling that a brassica is a brassica is a brassica. But it's our policy to never get off-label - even a little bit.

Seems like there has to be some reason only heading, and not leafing, brassicas are on the label. Anybody know why?

Jack

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Comments (2)

gardendawgie
13 years ago
poison still gets into the leaves. Use of Poisons only kills people. Do you want to be responsible for someone else dieing from cancer? then stop using poisons.
eltejano
Original Author
13 years ago
Just for the record ---

We always check with our extension agent before using any pesticide and we do not use carcinogenic chemicals. The active ingredient in Devrinol is Napropamide. Here's what Extoxnet says about it:

Carcinogenic effects: Two tests, each conducted over two years, revealed no cancer related changes in either rats or mice. The highest dose of napropamide in both of the studies was 100 mg/kg/day [30]. In both cases the only effects noted were decreases in body weight gains for both species. These data suggest that napropamide is not likely to be carcinogenic.
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