Insect Hotline Issue 24

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Acer with die-back caused by Japanese maple scale infestations.

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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.

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Close-up of an Acer trunk heavily infested with Japanese Maple scale.

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

Insect Hotline Issue 23

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Leopard moth adult. Photo provided by: Esmat M. Hegazi, University of Alexandria, Bugwood.org

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Leopard moth larva (caterpillar) and gallery. Photo provided by: Jean-Paul Grandjean, Office National des Forêts, Bugwood.org

Orange stripe oakworm

Orange striped oakworm.  Photo by:  Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

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Yellow woollybear caterpillar.  Photo provided by:  Whitney Cranshaw, Colorado State University, bugwood.org

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Yellownecked caterpillar.  Photo provided by:  Gerald J. Lenhard, Louisiana State University, bugwood.org

 

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Tussock moth caterpillar.  Photo by:  Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware

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Saltmarsh caterpillar.  Photo provided by:  Whitney Cranshaw, Colorado State University, bugwood.org

Insect Hotline Issue 22

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White prunicola or white peach scale on twigs of host.  Males cover the twigs and give the plant a ‘snowy appearnce’.

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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.

wps covered female with eggs WPS Gen2 Flipped20xB

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

acrypt damage acryptmeria scale closeup

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).

What’s Hot Insect HL Issue 21

Cicada killer visit energy stop

Cicada killer visits magnolia scale (possibly tuliptree scale) for the honeydew (free energy source)

 

 

 

 

 

Scoliid

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

Insect Hotline Issue 20

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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.

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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.

Mealybug destroyer on scale

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

Insect Hotline Issue 19

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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

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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

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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

Insect Hotline Issue 17

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Hibiscus sawfly adult.  Photo provided by:  Rose Hiskes, Diagnostician, Horticulturist at The Connecticut Agricultural Experiment Station

 

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Cocoons (pupae) of hibiscus sawflies.  Photo provided by:  Rose Hiskes, Diagnostician, Horticulturist at The Connecticut Agricultural Experiment Station

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Egg laying sites of hibiscus sawflies.  Photo provided by:  Rose Hiskes, Diagnostician, Horticulturist at The Connecticut Agricultural Experiment Station

 

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Hibiscus sawfly larvae.  Notice the rows of black tufts/spines on the body.  Photos by Brian Kunkel, University of Delaware

Insect Hotline Issue 16

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Masked chafer white grub (notice lack of pattern of the spines)

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Japanese beetle white grub (notice the v-shaped pattern to the spines)

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Oriental beetle white grub (notice the parallel lines of spines)

These are three common white grub species that may be found in turfgrass.

Insect Hotline Issue 15

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Pupal skin sticking out of the trunk of a tree.  Insect has emerged from the pupal skin which is left in the tree.  Photo provided by Whitney Cranshaw, Colorado State University, bugwood.org

 

 

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Adult Lilac/ash borer, Podosesia syringae, pinned for viewing.  Photo provided by:  Carroll Younce, USDA-ARS, bugwood.org