Plant Disease and Insect Diagnostic Laboratory

This limb was removed from a Chinese pistache tree that was wilted and browning. The browning in the vascular tissue is due to Verticillium wilt. Unfortunately, the disease is fatal.

Look who else we found at the Municipal Rose Garden in Tulsa. This rose is called Father Hugo.

Witches' broom is one symptom of rose rosette disease.

Jen Olson continues taking great pictures of RRD in Oklahoma. Here is a picture of the witches' broom symptom caused by RRD. The branch is from the rose Glowing Peace.

Sign-up today for the 2016 Landscape Pest and Disease Workshop! Check out the schedule and register at the link below.
http://agconferences.okstate.edu/events/2016-landscape-disease-pest-workshop

2016 LANDSCAPE DISEASE & PEST WORKSHOP — Agricultural Conferences Format: Presentations by Extension Specialists with hands-on, practical exercises for pest and disease identification and management

We took this picture at the Tulsa Rose Garden at the end of May. Can you tell which of the roses have resistance to black spot and which don't?

FYI.

Pretty neat.

Japanese pear rust is a very common problem this spring. The rust blew from junipers/cedars in March-April and leaf spots are now visible on the pears.

Rose rosette disease is an increasingly common problem in Oklahoma.

This tomato sample was submitted by one of our clients. Unfortunately, there is no cure for tomato spotted wilt virus and the plants must be discarded. For more information, see http://pods.dasnr.okstate.edu/docushare/dsweb/Get/Document-1327/EPP-7626web.pdf.

Entomosporium leaf spot on Red-Tip Photinia is a common problem in rainy springs. There are cultural management options, but fungicides are often necessary from April-June.

Fire ants are found in many Oklahoma counties.