The rain and 90F temperatures have boosted the growth of both crabgrass and yellow nutsedge in the last week or two. Unfortunately, our options for control of either weed are becoming limited. Plus the hot temperatures increase the risk for turf damage with any herbicide applied now. The best current option for crabgrass is Drive (quinclorac), which has the best activity among all the postemergence products on tillered carbgrass. Be sure to include a methylated seed oil as a surfactant. Drive will burn fine fescue consistently, and occasionally creeping bentgrass especially under high temperatures. Monsanto’s Certainty (sulfosulfuron) along with Gowan’s Sedgehammer (halosulfuron) are the two best products for yellow nutsedge control. At least two applications will be needed and these applications will only control this year’s crop of nutsedge at best, but have little effect on future infestations.