What’s Hot HL 26

Brown marmorated stink bug adults and nymph.
Photo by Gary Bernon, USDA APHIS, Bugwood.org

Western conifer seed bug.
Photo by Whitney Cranshaw, Colorado State University, Bugwood.org

Southern red mite.
Photo by John A. Weidhass, Virginia Polytechnic Institute and State University, Bugwood.org

Spruce spider mite with webbing.

Photo from USDA Forest Service – Region 4 Archive, USDA Forest Service, Bugwood.org

Weed Hotline Issue 26

Mesotrione effect on crabgrass and nutsedge.

Mesotrione effect on plantain and Oxalis.

Control of crabgrass with mesotrione in turf.
All photos from the presentation “Mesotrione for Weed Control in Warm- and Cool-Season Turf” by Travis W. Gannon, Fred H Yelverton, and Leon S. Warren, North Carolina State University, Department of Crop Science. To view the full presentation go to http://www.turffiles.ncsu.edu/extension/presentations/2006/Mesotrione_WeedControl.pdf

——-Special Alert——–

Chrysanthemum White Rust

Chrysanthemum white rust found in Delaware on Oct. 4, 2007

Chrysanthemum white rust caused by the fungus Puccinia horiana affects cultivated chrysanthemum plants in the Family Asteraceae. The disease is not established in U.S. chrysanthemum production, and could have significant impact on both greenhouse and outdoor plants of chrysanthemum, as well as cut flowers. The disease has occasionally been found in United States nursery stock in greenhouses, but it is easily and quickly cleaned up when found. Symptoms include yellow spots on the upper surface of the leaves that are up to 5 mm in size. On the underside of the leaves, raised bumps or pustules develop which have a waxy, warty appearance and are light in color. If you see signs of white rust on leaves or flowers of a plant purchased recently in Delaware, please take it to your nearest County Extension Office or contact the Delaware Department of Agriculture. Plants should be destroyed.

From Nancy Gregory, Plant Diagnostician, Department of Plant & Soil Sciences, University of Delaware