Weed Hotline Issue 21

Annual Bluegrass Seedlings
Photo from Weed Management in Nursery Crops, Oregon State University

Annual Bluegrass Seedlings -Note Boat Shaped Tips
Photo from Weed Management in Nursery Crops, Oregon State University

Annual Bluegrass in Tall Fescue Turf
Photos from Turffiles at North Carolina State University

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.
Brown Patch Pictures From North Carolina State University Plant Pathology Extension

Turfgrass Disease Information Note 15 (TURF-015)

Powdery Mildew on Lilac
Photo from Iowa State University Plant Disease Clinic

Weed Hotline Issue 20

Marestail (horseweed) in Flower

Marestail and Ragweed in Former Farmland Site

Former Farmland Field Growing Up in Marestail Prior to Being Developed

Canada Thistle, Common in Former Farmland Sites

Canada Thistle Showing Fluffy Seeds

Canada Thistle Patch
Bull Thistle, Not to be Confused with Canada Thistle
All Photos by Gordon Johnson
Extension Agriculture and Commercial Horticulture Agent, University of Delaware, Kent County

Insect Hotline Issue 20

Leopard Moth Larvae and Damage
Photo by Petr Kapitola, State Phytosanitary Administration, Bugwood.org

Leopard Moth Larvae and Damage
Photo by Jean-Paul Grandjean, Office National des Forêts, Bugwood.org

Leopard Moth Adult

Photo by James Solomon, USDA Forest Service, Bugwood.org

Leopard Moth
Photo by Louis-Michel Nageleisen, Département de la Santé des Forêts, Bugwood.org

Disease Hotline Issue 20

Diplodia (Sphaeropsis) Tip Blight
Photo from the Minnesota Department of Natural Resources Archive, Minnesota Department of Natural Resources, Bugwood.org

Diplodia (Sphaeropsis) Tip Blight
Photo from the Minnesota Department of Natural Resources Archive, Minnesota Department of Natural Resources, Bugwood.org

Diplodia (Sphaeropsis) Tip Blight

Photo from the USDA Forest Service Archive, USDA Forest Service, Bugwood.org

What’s Hot HL 20

Drough Effects on Landscape Plants in MD and DE.

Picture by Gordon Johnson, University of Delaware

Drought Effects on Shrubs and Trees in MD and DE
Photo by Gordon Johnson, University of Delaware

Azalea Lacebug Damage
Photo From Clemson University – USDA Cooperative Extension Slide Series, Bugwood.org

Dog Day Cicada
Photo by Jim Occi, BugPics, Bugwood.org

Weed Hotline Issue 19

White clover, an indicator of low mowing height and low fertility soil.

Spurge, an indicator of compacted soil.

Prostrate knotweed, an indicator of compaction.

Red Sorrel, an indicator of low pH, low fertility soil or dry soil.

Plantain, an indicator of low fertility soil.

Nutsedge and Oxalis (woodsorrel), indicators of wet soil.

Nimblewill, an indicator of excess shade.

Goosegrass, an indicator of compacted soil.

Crabgrass, an indicator of low mower height, wet soils, or high fertility.
Carpetweed, an indicator of dry soil.

Black Medic, an indicator of dry soil.

Bermudagrass (wiregrass), an indicator of low mowing height, compaction, or high fertility.

All Weed Pictures by Gordon Johnson, Extension Agent, Agriculture and Commercial Horticulture, University of Delaware, Kent County

Disease Hotline Issue 19

Microscopic close-up of Cercospora leaf spot on Endless Summer big leaf hyrdrangea (Hydrangea macrophylla ‘Bailmer’); note, purple halo around spot.

Photo by Missouri Botanical Garden, Kemper Center for Home Gardening, IPM

Cercospora leaf spot on lower leaf surface of Endless Summer big leaf hyrdrangea (Hydrangea macrophylla ‘Bailmer’).
Photo from the Missouri Botanical Garden, Kemper Center for Home Gardening, IPM
Cercospora leaf spot on upper leaf surface of Endless Summer big leaf hyrdrangea (Hydrangea macrophylla ‘Bailmer’).
Photo from Missouri Botanical Gardens, Kemper Center for Home Gardening, IPM

Cercospora on Rose
Photo by Jody Fetzer, New York Botanical Garden, Bugwood.org

Black Spot on Rose
Photo from the Iowa State University Plant Disease Clinic
Black Spot on Rose
Photo from the Iowa State University Plant Disease Clinic

Mutinus caninus, a type of stinkhorn, growing on mulch
Photo by Paula Flynn, Extension Plant Pathologist, Iowa State University