By Jeff Rectenwald, Asgrow/Dekalb agronomist
Post-emergence herbicide tank mixtures are an important element of integrated weed management of tough-to-control broadleaf weeds in corn. Environmental conditions, such as those that have favored development of thin cuticles on the leaf surfaces of corn this spring, influence the absorption of post-emergence herbicides and potential crop tolerance. Warm, humid conditions promote rapid absorption while cool conditions may slow crop development, herbicide uptake and crop selectivity. Crops under stress may not metabolize herbicides quickly enough to avoid crop injury. Therefore, it is important to take appropriate steps to minimize the risk for injury.
Basics of leaf cuticles
The leaf cuticle changes during early corn development. From emergence to V4, under normal conditions, corn leaves have crystalline deposits of wax on the cuticle, which reduce herbicide spray retention and leaf wet-ability by trapping air under the spray droplets. There is rapid change in the cuticle from V5 to V8 as the wax becomes a smooth film on the leaves.… Continue readingRead More »