Samples with the following problems have been seen in the Clinic lately:

Plant Diseases

• Bur oaks with browning (see this week's article)
• Cedar apple rust
• Environmental stress on many plants
• Hosta petiole rot
• Oak wilt
• Peony leaf blotch
• Powdery mildew on ninebark
• Rose rosette disease
• Septoria leaf spot on tomato
• Verticillium wilt on maple

Insects and Mites

• Spider mites on soybeans
• Mite damage on coneflower
• Cypress twig gall midge
• Oak sawfly
• Saddleback caterpillar (Not previously reported in Iowa!)
• Northern corn rootworm beetles

Peony leaf blotch, a common late summer fungal disease.

Saddleback caterpillar: one of the stinging caterpillars