Wednesday, April 30, 2008
Wednesday, April 23, 2008
Weed Hotline Issue 4
Flowering white clover.
White clover. Photos provided by Gordon Johnson, Kent County Extension agent, University of Delaware, Agriculture and Commerical Horticulture
Disease Hotline Issue 4
Close-up of apple scab. Photo by Bob Mulrooney, Extension Plant Pathologist, University of Delaware.
What's Hot HL 4
Gypsy moth larvae. Early instars shortly after hatching from egg mass.
Gypsy moth larvae starting to hatch from egg masses.
Gypsy moth egg masses. Gypsy moth photos are provided by Pennsylvania Department of Conservation and Natural Resources - Forestry Archive, , Bugwood.org.
European pine sawfly infestation. Photo by John A. Weidhass, Virginia Polytechnic Institute and State University, Bugwood.org.
European pine sawfly eggs. Photo by A. Steven Munson, USDA Forest Service, Bugwood.org.
Boxwood psyllid nymph. Photo by Nancy Gregory, Plant Diagnostician, University of Delaware 2007.
Cupped leaf with "lerps" caused by boxwood psyllid feeding. Photo by Brian Kunkel, Ornamentals IPM Specialist, University of Delaware 2008.
Number of lace bug nymphs clustered close together. Photo by Brian Kunkel, Ornamentals IPM Specialist, University of Delaware 2007.
Azalea lace bug nymph. Photo By Tracey Wooten, Horticulture Extension Agent - Sussex County, University of Delaware.
Insect Hotline Issue 4
Spruce spider mite adult and egg. Photo provided by USDA Forest Service - Northeastern Area Archive, USDA Forest Service, Bugwood.org.
Close-up of spruce spider mite damage. Photo by Brian Kunkel, University of Delaware.
Heavy spruce spider mite infestation. Photo provided by USDA Forest Service - Northeastern Area Archive, USDA Forest Service, Bugwood.org.
Spruce spider mite damage. Photo provided by USDA Forest Service - Northeastern Area Archive, USDA Forest Service, Bugwood.org.
Southern red mite: eggs, nymphs, and adults. Photo provided by Jim Baker, North Carolina State University, Bugwood.org.
Damage by Southern red mite. Note the grayish leaves. Photo provided by Frank A. Hale, University of Tennessee, Bugwood.org.
Thursday, April 17, 2008
What's Hot HL 3
Spruce spider mite eggs (peak egg hatch 172 GDD). Photo by USDA Forest Service Archive, USDA Forest Service, Bugwood.org.
Damage caused by spruce spider mite feeding (shows up during summer). Photo by USDA Forest Service - Northeastern Area Archive, USDA Forest Service, Bugwood.org.
Garlic mustard early. Photo by Nancy Fraley, USDI National Park Service, Bugwood.org.
A flowering garlic mustard plant. Photo by Dan Tenaglia, Missouriplants.com, Bugwood.org.
Forest understory invasion by garlic mustard. Photo by Leslie J. Mehrhoff, University of Connecticut, Bugwood.org.
Weed Hotline Issue 3
Orchardgrass image 1.
Orchardgrass image 2.
Orchardgrass image 3. Orchardgrass images are courtesy of Gordon C. Johnson
Kent County Extension Agent – Agriculture & Commercial Horticulture.
Disease Hotline Issue 3
Frog-eye leaf spot on maple.
Anthracnose on liriope.
Botyosphaeria canker on Cornus.
Sycamore anthracnose. All photos by Bob Mulrooney, Extension Plant Pathologist, University of Delaware.
Thursday, April 10, 2008
Weed Hotline Issue 2
Wild onion photo from NC State weed web page.
Wild garlic photo originally from Purdue University weed web page.
Star of Bethlehem. Photo by Virginia Tech
Disease Hotline Issue 2
Cedar apple rust on juniper.
Cedar apple rust close-up.
Cedar apple rust on crabapple.
Crabapple scab on the fruit.
Close-up of crabapple scab
Crabapple scab. All disease photos taken by Bob Mulrooney, University of Delaware.
What's Hot HL 2
Juniper webworm larva. Image provided by Connecticut Agricultural Experiment Station Archive, Connecticut Agricultural Experiment Station, Bugwood.org
Juniper webworm damage. Image provided by Connecticut Agricultural Experiment Station Archive, Connecticut Agricultural Experiment Station, Bugwood.org
White pine sheath mites. The small white images in the faint red circles are the mites. Image provided by http://woodypests.cas.psu.edu/PestDiagnosis/Pine.html