Weeds that emerge before the crop can be highly damaging to crop yield potential because they out-compete the crop for moisture, nutrients and sunlight. A small number of weeds (even just a few per square foot) emerging before or with the crop can be much more damaging to yield potential than a larger number of weeds flushing later. But spraying conditions are not always perfect, which can put the brakes on timely applications. Please read the latest article with tips for spraying in tough conditions.