| To control crabgrass and dandelions before they sprout, apply a preemergence herbicide. |
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| Sometimes a herbicide may be applied postemergence to the crop but preemergence to the weeds. |
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| With respect to planting time, herbicides are also classified as preplant, preemergence, or postemergence weed killers. |
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| Too little rainfall will reduce the activation of preemergence herbicides and reduce postemergence herbicide absorption into the leaf. |
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| For broadleaf cover crops: A stale seedbed and preemergence burnoff, with a high seeding rate appears to give the best results. |
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| Dacthal can be applied before planting as a pre-plant incorporated treatment or soon after planting as a preemergence treatment. |
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| For road transport remove the marker discs of the preemergence marker. |
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| Milestone Herbicide also provides preemergence control of germinating seeds and control of emerged seedlings of susceptible plants following application. |
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| After planting, soil-active herbicides like pronamide and S-metolachlor and trifluralin are applied to provide preemergence control of weeds. |
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| Because the seed germinates later than that of desirable competitors, preemergence herbicide sprays may be useful as a means of eliminating the plants. |
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| If whilst creating tramlines the tramline coulters do not deliver any seed, both marker discs of the preemergence marker drop into work, marking the soil and creating tramlines. |
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| The boom should be adjusted to the appropriate height above the target, either the ground for preemergence applications or the weed canopy for post-emergence applications. |
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| For successful preemergence treatments the crops must either be tolerant of the chemical at the seedling state or the toxicity must have disappeared before the crop emerges. |
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| For burndown and residual control of selected annual weeds in corn apply Roundup Transorb HC Liquid Herbicide plus Primextra II Magnum preplant surface or preemergence application before crop emergence. |
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