Cooperative Extension Ornamentals

Friday, August 24, 2007

Insect Hotline Issue 22

Baldcypress (Taxodium) Rust Mite Damage - Whole Tree View

Baldcypress Rust Mite Damage - Branch View

Baldcypress Rust Mite Damage - Needle View

Baldcypress Rust Mite Magnified

All photos by Dr. Casey Sclar, Plant Health Care Division Leader, Longwood Gardens

Disease Hotline Issue 22

Mushrooms growing on Mulch

Photo from University of Cincinatti, Clermont College, Biology

Slime mold on mulch

Photo from University of Tennesee Plant Pathology

Slime mold on mulch

Photo by Peggy Sellers, Purdue University

Birds nest fungus

Photo from Department of Plant Pathology, Washington State University

Stinkhorn mushroom Clathrus spp

Photo by Paul A. Mistretta, USDA Forest Service, Bugwood.org

Dog stinkhorn fungus Mutinus caninus

Photo by Chris Evans, River to River CWMA, Bugwood.org

Stinkhorn mushroom Linderia columnata

Photo by David J. Moorhead, University of Georgia, Bugwood.org

Septoria Leaf Spot on Cornus florida

Photo from Division of Plant Industry Archive, Florida Department of Agriculture and Consumer Services, Bugwood.org

Septoria Leaf Spot on Cornus

Photo from Online Guide to Plant Disease Control, Oregon State University

http://plant-disease.ippc.orst.edu/disease.cfm?RecordID=1279

Friday, August 17, 2007

What's Hot HL 21

Mass of Webworms

Extensive Webbing by Webworms

Webworm Damage

Dogwood Sawflies

Dogwood Sawfly Damage

White peach or prunicola scale

All Photos by Brian Kunkel, Extension Ornamental IPM Specialist, University of Delaware

Weed Hotline Issue 21

Annual Bluegrass Seedlings

Photo from Weed Management in Nursery Crops, Oregon State University

http://oregonstate.edu/dept/nursery-weeds/weedspeciespage/annual_bluegrass/annual_bluegrass_page.html

Annual Bluegrass Seedlings -Note Boat Shaped Tips

Photo from Weed Management in Nursery Crops, Oregon State University

http://oregonstate.edu/dept/nursery-weeds/weedspeciespage/annual_bluegrass/annual_bluegrass_page.html

Annual Bluegrass in Tall Fescue Turf

Photos from Turffiles at North Carolina State University

www.turffiles.ncsu.edu

Annual Bluegrass in Flower (Spring)

Photo from Turfweeds.net at Virginia Tech

Insect Hotline Issue 21

Magnolia Scale

Sooty mold on trunk as a result of magnolia scale honeydew production

Honeydew being produced by magnolia scale

Magnolia Scale Cluster

Branch Dieback Due to magnolia scale

Ants With magnolia scales

Tuliptree Scale

All magnolia scale Photos by Brian Kunkel, Extension Ornamental IPM Specialist, University of Delaware. Tuliptree scale picture by Gerald Lenhard, bugwood.org

Disease Hotline Issue 21

Drought and heat effects on perennials - Hosta

Photo by Gordon Johnson, University of Delaware

Brown patch produces characteristic symptoms on tall fescue leaves: irregularly shaped lesions that are tan in color with a dark brown border.

From a distance, brown patch appears in brown, tan, or yellow patches ranging from 6 inches to several feet in diameter. The infected leaves typically remain upright, rather than collapsing to the ground.