Insect Hotline Issue 12

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Bagworms in the “dunce cap” stage.  B. t. and Conserve provide good control at this stage.

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Bagworm infestation with bags already drooping down.

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Damage from bagworm feeding (Photo by: T. Simms).

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Bag with green foliage incorporated into it suggests a live caterpillar inside the bag.  Insect growth regulators (Dimilin or Confirm), Acelepryn, Conserve (depending on bag/caterpillar size and population density) pyrethroids, acephate or carbaryl provide good control against larger caterpillars.  Caterpillar feeding is usually finished by mid-August, consequently hand picking in September – May is a good method to reduce next season’s populations.  Photos provided by:  Brian Kunkel, University of Delaware

Insect Hotline Issue 11

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Close-up of roseslug sawfly larva.

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Roseslug sawfly damage called ‘window-paning’.  The leaf epidermis becomes ‘frosted’ as leaf dries out from feeding on underside of leaf.

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‘Window-paning’ damage on Knock-out Roses caused by roseslug sawflies.

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Underside of rose leaf with damage caused by roseslug sawfly.  Larva is feeding on leaf.  All photos provided by Brian Kunkel, University of Delaware

Disease Hotline Issue 13

Cytospora canker on an apple.  Photo provided by:  William Jacobi, Colorado State University, Bugwood.org

 

 

Cytospora canker on a willow twig.  Photo provided by:  William Jacobi, Colorado State University, Bugwood.org

 

 

Tobacco Rattle Virus on Hosta leaf.  Photo provided by:  Alan Windham, University of Tennessee, Bugwood.org

 

 

Tobacco Rattle Virus on Peony.  Photo provided by:  R.K. Jones, North Carolina State University, Bugwood.org

 

 

Tobacco Rattle Virus on Hosta.  Photo provided by:  Alan Windham, University of Tennessee, Bugwood.org

 

 

 

Tobacco rattle virus on epemedium.  Photo provided by:  Bob Mulrooney, University of Delaware, Plant Pathology Extension Specialist

Disease Hotline Issue 11

Powdery mildew on Coreopsis.

 

 

 

 

 

Powdery mildew on dogwood.  Photos for powdery mildew are from Bob Mulrooney, University of Delaware.

 

 

 

 

 

 

Photos for anthracnose on ash and Dutch elm disease have previously been posted.  Please use the search function to locate these images.