Sustainable Practices for Vegetable Production in the South
Dr. Mary Peet, NCSU
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Examples of critical weed-free periods for selected weeds in vegetable crops
|
Crop |
Location of study |
Critical weed-free period* |
Major weeds present |
|---|---|---|---|
| Beans, snap | NJ, MA | Emerg. to full bloom-2 to 4 WAE | cocklebur, purslane |
| Cabbage (transplanted) | Ontario | 3 to 4 WAP | lambsquarters, pigweed, crabgrass, green foxtail |
| Muskmelon | Israel, FL | 4 to 6 WAE 0 to 3 WAE |
pigweed species, smooth amaranth |
| Onions | OR | all season | redroot pigweed |
| Squash (summer) | CT | 4 to 6 WAP | quackgrass, lambsquarters, ragweed |
| Sweetpotato | Philippines | 2 to 4 WAT | grasses, morningglory |
| Tomato (bareground) | Ontario | 28 to 35 DAT | lambsquarters, ragweed, pigweed, crabgrass, foxtail species, purslane |
| Watermelon | NC | 2 to 4 WAT | large crabgrass |
*WAE: weeks after emergence, WAP: weeks after planting, DAT: days after transplanting and WAT: weeks after transplanting.
bridgesj@unity.ncsu.edu