April 15, 2014 in Uncategorized
Acer with die-back caused by Japanese maple scale infestations.
Close-up of an Acer branch with gloomy scale (dark circular raised) and Japanese maple scale (brownish is the underlying skin after waxy white has been wiped or worn away). Japanese maple scale are also the white kind of oyster shaped insect on the branch.
Close-up of an Acer trunk heavily infested with Japanese Maple scale.
Close-up of Japanese maple scale on a Cornus trunk. The brownish colored insects are the same scale, but where the white waxy covering has been worn or wiped away. All pictures were provided by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware
Leopard moth adult. Photo provided by: Esmat M. Hegazi, University of Alexandria, Bugwood.org
Leopard moth larva (caterpillar) and gallery. Photo provided by: Jean-Paul Grandjean, Office National des Forêts, Bugwood.org
Orange striped oakworm. Photo by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware
Yellow woollybear caterpillar. Photo provided by: Whitney Cranshaw, Colorado State University, bugwood.org
Yellownecked caterpillar. Photo provided by: Gerald J. Lenhard, Louisiana State University, bugwood.org
Tussock moth caterpillar. Photo by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware
Saltmarsh caterpillar. Photo provided by: Whitney Cranshaw, Colorado State University, bugwood.org
White prunicola or white peach scale on twigs of host. Males cover the twigs and give the plant a ‘snowy appearnce’.
Close examination of an infestation (picture on the left) would reveal males (elongate and yellow), rounded and yellow, and dead male (dead from pesticide application; elongate and tannish brown). Picture on left is a close-up of the scale cover lifted off of a female white peach or white prunicola scale.
Picture on left above is of a female laying eggs with the cover still in place. Picture on right is same female but the scale covering (the ‘test’) removed. All photos were taken by Nancy Gregory, plant diagnostician and Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware
Picture on left shows banding on fir caused by Cryptomeria scale (photo by Brian Kunkel) and the picture on the right is a close-up of the infestation the undersides of the leaves (photo provided by: Lorraine Graney, Bartlett Tree Experts, bugwood.org).
August 28, 2013 in Insects
Cicada killer visits magnolia scale (possibly tuliptree scale) for the honeydew (free energy source)
Scoliid wasps visiting flower for nectar and are frequently found flying over areas of turf looking for Green June beetle larvae to parasitize. Neither wasp is aggressive or likely to sting unless handled; thus treatments are seldom warranted. All photos provided by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware
August 28, 2013 in Insects
Damage from dogwood sawfly larvae feeding. They consume entire leaf but leave main veins.
Early instars of dogwood sawfly have a white powdery/waxy covering which they lose as the age and get ready to look for pupation locations. All photos provided by: Brian Kunkel, Ornamentals IPM Extension Specialist
Magnolia scale on star magnolia trees. Notice the drop of honeydew about to fall from the swelling female on the right. Dark patches on the trunk are sooty mold growing on the honeydew.
Tuliptree scale on tulip popular. This scale also produces copious amounts of honeydew and looks very similar to magnolia scale. Microscopic investigation reveals which species. Crawlers are active for both species about the same time and scouting is crucial to know when they are active. Use GDD to target ideal scouting times.
The white waxy insect in this picture is a lady beetle larva feeding on the adult scales. All pictures were taken by: Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware
Fall webworm tents on trees. They occur in the fall and are at the terminal ends of branches. Photos by Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware
Orange (red headed) race of fall webworms (left) or the blackheaded race of fall webworms (right) could be found in the webbing. Photo provided by: Lacy L. Hyche, Auburn University, Bugwood.org
One management option is to tear open the webbing so natural enemies such as the assassin bug pictured above can eat the caterpillars. Photo provided by: Lacy L. Hyche, Auburn University, Bugwood.org