Glufosinate does not have any residual activity and will not control weeds not yet emerged. A second preemergence application or a postemergence applications may require tank mixing with a residual products for extended control in problematic fields. Sequential applications should be at least 10 to 14 days apart. Maximum amount that can be applied on LL corn and soybean, in sequential applications, is 44 fl oz/A/growing season. For more consistent lambsquarter and velvetleaf control apply between dawn and 2 hours before sunset. The use of soil residual herbicides before crop emergence can reduce the number of crop postemergence applications required or provide a larger window for later season control.

In LL corn, Ignite 280 SL can be applied over-the-top to corn up to and including V5 [five developed collar leaves] at a rate of 22 fl oz/A. To reduce possible leaf burn Ignite 280 SL must be applied with ammonium sulfate [AMS] at 3 lb/A or 1.5 lb/A if temperatures are expected to exceed 85 degrees F.

Ignite 280 SL can be applied postemergence at 22 fl oz/A in LL soybean from emergence up to but not including the bloom stage. Applications should be made 70 days before harvest of soybean. Do not graze or cut soybean for hay. Unlike corn, the soybean section of the Ignite 280 SL label did not have an AMS use requirement at the time of writing this article. Ignite 280 SL and the LL system will be marketed as an alternative to a glyphosate tolerant system. It allows rotating herbicide modes of action to reduce the potential of developing glyphosate resistance biotypes of weeds. Glufosinate and glyphosate are both non-selective herbicides and slight differences exist in efficacy of some species (table 1). Glufosinate can be slightly less effective on grasses such as yellow foxtail, johnsongrass, quackgrass, shattercane, and barnyardgrass, but is more effective on some of the broadleaf weeds such as annual morningglory, black nightshade, and smartweed. Timing is more crucial than with glyphosate[1, 2]. However, weed size is still important with glyphosate; spray applications should be done when weeds are 4 to 6 inches tall.