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

What’s Hot HL 19

Spider mite damage.
John A. Weidhass, Virginia Polytechnic Institute and State University, Bugwood.org

Spider mites feeding on leaf.
John A. Weidhass, Virginia Polytechnic Institute and State University, Bugwood.org

Spider Mite Magnified.
Photo by David Cappaert, Michigan State University, Bugwood.org

Green June Beetle
Photo from University of Georgia Archives, University of Georgia, Bugwood.org

Cicada Killer and its Prey

Photo by Howard Ensign Evans, , Bugwood.org

Female Cicada Killer in Flight

Weed Hotline Issue 18

Bermudagrass control experiment with glyphosate and Basamid

Nimblewill control experiment with glyphosate and Basamid

Nimblewill control in fall with glyphosate (Roundup) and Basamid

Basamid application uniformity is key when not tarped.

All slides from a presentation by Shawn Askew, Extension Turfgrass Weed Scientist, Virginia Tech.

Insect Hotline Issue 18

Honeylocust pod gall midge

Photo by Whitney Cranshaw, forestryimages.org

Honeylocust pod gall midge damage
Photo by E. Bradford Walker, forestryimages.org

Honeylocust Pod Gall Midge Damage

Photo by Whitney Cranshaw, forestryimages.org

Honeylocust Pod Gall Midge Damage

Photo by Michael Masiuk, woodypests.cas.psu.edu/FactSheets/InsectFactSheets/html/Honey_Pod_Gall_Midge.html

Mimosa Webworm on Honeylocust

From Kansas Insect Newsletter, July 14, 2006, KSU Entomology Extension

Honeylocust Spider Mite
Photo by Whitney Cranshaw, forestryimages.org

Honeylocust Plant Bug
From woodypests.cas.psu.edu/FactSheets/InsectFactSheets/html/Honeylocust.html

Honeylocust Leafhopper

Photo by Whitney Cranshaw, forestryimages.org