Slime Mold on Turfgrasses Has your lawn been slimed? Fear not, the grayish-black sooty substance on your turfgrass is a harmless soil protozoa that has temporarily migrated onto blades and stems to produce and disperse spores. Diagnosis: Slime Mold, Physarum and Fuligo sp./spp. The occurrence is prompted by spells of … Read more
Weeds can be a major pest of lawns and recreation fields, competing for resources and sunlight while detracting from their natural beauty. If your spring checklist includes lawn weed management, now is the time to take a closer look at the tiny mat of weed seedlings forming in mid-winter (Jan-Feb.), … Read more
Winter is the time to scout for lawn burweed (Soliva pterosperma), a broadleaf weed producing seed clusters in mid to late spring that delivers a rather irritating jab to bare feet. The tiny spines on the seeds are actually quite fragile and tend to break off in your skin during … Read more
Many herbicide labels will contain a statement such as “Do not apply when temperatures are above 90° F”. Turf managers who carefully follow label instructions will see these disclaimers and may hesitate before applying herbicides. There are several factors turf managers should consider when applying herbicides in summer.
The warming of spring days brings about a flurry of spring sports activities. All of a sudden, players begin to complain about the field. “There’s some little weed out there that has stickers on it”. The coaches quickly huddle around the “sticky problem” and observe that the field is infested with a spiny, low-growing weed that is annoying the players. The question becomes “What is this weed and how the #!*@ do we get rid of it?”
Weed control in irises can be difficult. Fortunately, many annual broadleaf and grassy weeds can be easily controlled with mulches and the judicious use of herbicides. This publication by Dr Mark Czarnota, UGA Weed Scientist, lists cultural and chemical methods for weed control in iris.
An herbicide designed to kill weeds in turfgrass can also kill neighboring trees and shrubs. Herbicides in the phenoxy chemical class provide broadleaf weed control in lawns (2,4-D; MCPP; dicamba; clopyralid; and triclopyr). These chemicals are considered very safe and leave very few toxicity concerns for animals but we need to protect landscape trees and shrubs with some special precautions.
Turf can be more sensitive to stresses during greenup – especially herbicides. What herbicides can I use during greenup, which ones can I not use? How can I reduce the impact of herbicides on turf? What are the effects of herbicide use on lawns. Image – White clover, Whitney Cranshaw, Colorado State University, Bugwood.org