Removal of weeds that have already germinated with herbicides requires a postemergent herbicide. Generally there are limitations to what you can spray and not also kill the plants that you are trying to grow. Here is a factsheet that might help you decide what kinds of herbicides you can add to your toolbox for dealing with weeds.
Postemergent Herbicides for Use in Ornamentals (http://edis.ifas.ufl.edu/wg059) is a 5-page fact sheet and is largely comprised of two tables: Table one lists postemergent herbicides that can be safely used over the top of some ornamentals when used according to label directions; table 2 lists postemergent herbicides that are registered for use around ornamental plants when applied as a directed spray. This factsheet was written by Jeffrey G. Norcini and Chris Marble, and published by the UF Department of Environmental Horticulture, November 2014.
In need of CEUs? Earn up to 6 in many categories including Private, O&T, and Right-of-Way. Join us at Hillsborough County Extension for the Florida Turfgrass Annual CEU Day. July 22, 08:30-16:00. Register online at http://www.ftga.org/ceu‐round‐up Food will be provided. Cost is $30.00 for municipal workers, $50.00 for Industrial. Call Shawn with questions 813-744-5519 x 54147.
8:30 – 9:00 Registration
9:00—9:50 Factors to Consider When Developing A Weed Management Program
10:00 – 10:50 How Herbicides Work & Where They Go
11:00—11:50 Preventing Herbicide Failures
11:50—1:00 Lunch (provided)
1:00—1:50 Understanding Adjuvants
2:00—2:50 BMP in Urban, Aquatic & Natural Systems
3:00—3:50 Identification & Integrated Management of Invasive Grasses
In this class you will learn the underlying horticultural science of plant growth from experienced PhD University of Florida instructors (Drs. Brian Pearson, Rosanna Freyre and Paul Fisher).
A little about the class...
• Make effective crop decisions by understanding the “why”
and not just the “how”.
• Lectures & assignments in both English and Spanish.
• Designed for greenhouse employees in the U.S. and internationally who do not have formal training in horticulture. The typical participant is a section grower who has practical experience and is responsible for planting, spraying, pinching, irrigating and fertilizing ornamental crops in containers
Topics will include.
1. Plant Parts & Functions
2. Photosynthesis and growth
3. Greenhouse technology
5. Compactness and branching
6. Growing substrates and water
8. Plant health
Cost will be $200.00 per person. To find out more and to register please click on this link. https://reg.distance.ufl.edu/reg/Activity/Details/BB356A4F4EE143E78276DE58ED7F85FE
Boxwood blight is a devastating boxwood disease and it has just been found in North Florida. A disease alert has been issued from UF/IFAS and FDACS DPI. If you grow or purchase boxwood please take a moment and read the alert found at the link below. There has been a bunch of research done in North Carolina on the cultural control, variety selection, and chemical control which can also be found at the same link. If you suspect you might have problems please give Extension a call. Photo credit Mathews Paret. link. http://hillsborough.ifas.ufl.edu/ornamental_production/index.shtml