April 26, 2013 in Insects
Close-up of boxwood leafminer larvae after boxwood leaf is broken open. Photo provided by: Nancy Gregory, University of Delaware
Blistered boxwood leaf and boxwood leafminers. Photo provided by: John Weidhass, VA Polytechnic Institute & State University, bugwood.org
Boxwood leafminer adult. Photo provided by: John Baker, NC State University, bugwood.org
April 16, 2013 in Caterpillars, Insects
Above picture is of a later instar of the eastern tent caterpillar. Photo was provided by author imbedded with picture via insect images.org
Photo above is a picture of an early tent formed by eastern tent caterpillars. A successful non-chemical control strategy is to tear the ‘tent’ or webbing open so natural enemies have access to the caterpillars. Photo provided by Tracy Wootten, University of Delaware.
Photo above is an egg mass laid by eastern tent caterpillar female moths in late June or July. A control tactic here is to either prune out the egg mass or scrape the mass off the twig. Photo provided by Brian Kunkel, University of Delaware
April 16, 2013 in Insects
Above picture is of a frass ‘toothpick’ sticking out from trunk of tree.
Above pictures is of the oviposition chamber and larval gallery of one of the bark beetles, Xylosandrus spp.
Above picture is of the bark beetle, Xylosandrus germanus (ambroisa beetle)
Above picture is of the bark beetle, Xylosandrus crassiusculus (granulate ambrosia beetle)
The above pictures were provided by various authors (imbedded in photo) via bugwood.org
April 3, 2013 in Insects
Thrips feeding damage on greenhouse grown plants. Photo by: Brian Kunkel, University of Delaware
Feeding damage by thrips on flower petals. Photo by: Brian Kunkel, University of Delaware
Thrips feeding damage on flower petals. Photo by: Brian Kunkel, University of Delaware
Immature thrips feeding on foliage. Photo by: Nancy Gregory, University of Delaware
May 14, 2012 in Armored scale, Community Pictures, Insects
Armored scale are frequently some of the most difficult landscape pests to control. Over the past several years Japanese maple scale has become more prevalent in landscapes and this insect pest feeds on many different hosts.
Included with this post are some images of Cornus florida with Japanese maple scale taken at Mount Cuba. This insect pest has two generations a year for our area with eggs being found currently. First generation crawlers should be out soon. Scouting with double sided tape around branches with infestations is one way you can scout for crawler activity. Other possible hosts include: Acer, Chaenomeles, Cornus, Cotoneaster, Euonymus, Ilex, Prunus, Rosa, Syringa, Zelkova and many others.
Both images taken at Mount Cuba by Jimmy Testa
May 14, 2012 in Community Pictures, Disease
This fantastic picture of cedar quince rust was taken at Mount Cuba by Jimmy Testa.
This fantastic picture of cedar apple rust was taken at Mount Cuba by Shelby French.
Great work and others should feel free to send in images…
January 13, 2012 in Weeds
Photos for crabgrass have been posted to the site previously. Please use the search function to locate these images.
September 23, 2011 in Weeds
Images of Japanese stilt grass have been posted previously. Please use the search function to locate these pictures.
September 23, 2011 in Disease
Photos of Septoria leaf spot, Cercospora leaf spot, fairy rings, and stink horns have all been posted previously. Please use the search function to locate these images.
