![]() Pigweeds are prolific seed producers that can continue to form seeds even after mowing or tilling, so it is important to clean up fields soon after harvest and Remove plants that have flowered from the field.Īs biological control agents, Pigweed seeds are consumed by various seed predators. Pigweed seed density may be reduced by rotating the seed bank with sod crops, bare fallows, and/or integration of a legume crop. (For reference, some seedlings may penetrate 3,600 lb/acre of loose straw.) Mulch is an option in vegetable and small fruit make sure to apply a thick and dense mulch. Avoiding excessive fertilization reduces pigweed’s competition with crops. ![]() Seedlings can be eliminated by harrowing spring grains between the 3-leaf stage and stem elongation. To maximize the competitive advantage of small grain crops over the weed, it is important to set up a dense, uniform, and healthy stand. When the crop is large enough to tolerate inter-row cultivation, slightly hilling before pigweed’s first true leaves emerge will control plants in the crop row. The final seedbed preparation must be shallow (no more than 3.8 cm/~1.5″) to avoid pulling fresh seeds up into the germination zone at the soil surface. One effective management method is a stale seedbed, including a one- to two-week lag between initial and final seedbed preparation in late spring or summer.
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