Indian wax scale removed from stem. Red coloration is the female insect.
Wax scales on holly branch. Photos provided by Brian Kunkel, Ornamentals IPM Extension Specialist, University of Delaware
Bagworms in the “dunce cap” stage. B. t. and Conserve provide good control at this stage.
Bagworm infestation with bags already drooping down.
Damage from bagworm feeding (Photo by: T. Simms).
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
Close-up of roseslug sawfly larva.
Roseslug sawfly damage called ‘window-paning’. The leaf epidermis becomes ‘frosted’ as leaf dries out from feeding on underside of leaf.
‘Window-paning’ damage on Knock-out Roses caused by roseslug sawflies.
Underside of rose leaf with damage caused by roseslug sawfly. Larva is feeding on leaf. All photos provided by Brian Kunkel, University of Delaware
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 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