Plant Disease and Insect Diagnostic Laboratory

06/12/2016

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.

06/10/2016

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

06/09/2016

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.

06/08/2016

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

Format: Presentations by Extension Specialists with hands-on, practical exercises for pest and disease identification and management

06/08/2016

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?

05/21/2016

FYI.

05/21/2016

Pretty neat.

05/04/2016

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.

05/03/2016

Rose rosette disease is an increasingly common problem in Oklahoma.

05/03/2016

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.

05/02/2016

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.

04/29/2016

Fire ants are found in many Oklahoma counties.