Plant Disease and Insect Diagnostic Laboratory

The primary goal of the PDIDL is to provide Oklahoma residents with both accurate diagnoses of plant

Operating as usual

Photos from Plant Disease and Insect Diagnostic Laboratory's post 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.

Photos from Plant Disease and Insect Diagnostic Laboratory's post 06/10/2016

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

Timeline photos 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.

Timeline photos 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.

Photos from Rick Mitchell NBC5's post 05/21/2016

Pretty neat.

Photos from Plant Disease and Insect Diagnostic Laboratory's post 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.

Photos from Combating Rose Rosette's post 05/03/2016

Rose rosette disease is an increasingly common problem in Oklahoma.

Timeline photos 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.

Timeline photos 04/29/2016

Fire ants are found in many Oklahoma counties.

Photos from Plant Disease and Insect Diagnostic Laboratory's post 04/28/2016

A witches' broom is when multiple shoots or branches emerge from the same or nearly the same point. This is a classic symptom of rose rosette disease. Combating Rose Rosette

Timeline photos 04/21/2016

Herbicide injury on tomato. May be due to drift or volatilization of herbicides. Also may come from manure or compost that was added to the soil. Some plant viruses look similar, but we can test for those.

Timeline photos 04/20/2016

Christmas in April. From by one of our friends in Rogers County.

Photos from Plant Disease and Insect Diagnostic Laboratory's post 04/14/2016

If you see rust diseases on Eastern red cedar, spores are releasing that infect the alternate hosts. To prevent rust on the alternate hosts (quince, apple, crab apple, pear, hawthorne), treat the leaves with fungicides.

Photos from Plant Disease and Insect Diagnostic Laboratory's post 04/13/2016

Many areas in OK have had rain this week. In areas receiving rain, expect to see rust on the cedar trees (Juniperus spp.) pop very soon. Send us your pictures!

Photos from Plant Disease and Insect Diagnostic Laboratory's post 04/12/2016

Healthy canola is in full bloom across Oklahoma. Canola with aster yellows disease (caused by a phytoplasma) may be stunted, bunchy, and the flowers remain green.

Timeline photos 04/05/2016

If you have roses in a nursery or greenhouse, keep scouting for downy mildew. If humidity is high, also check your other crops for other downy mildews.

Timeline photos 04/03/2016

Begin treating to prevent Diplodia tip blight and canker of pine when the needles begin emerging on the 'candles'.

Timeline photos 04/01/2016

It's tempting to plant tomatoes early, but hold off since we are likely to have frosts/freezes in April. Before planting, be sure to gradually expose tomatoes to outside temperatures. The tomato leaves in this image were from a plant that was not hardened off. In most cases, the plants will recover, but the damage will set them back.

Timeline photos 03/31/2016

The first spots from Hollyhock rust usually show up in mid-April. If you have had a problem in the past, apply preventative fungicides a few days before rainy weather this spring at 7-14 day intervals.

Timeline photos 03/30/2016

We've had several freezes during bloom, so it would be a good idea to check the flowers if you are expecting a crop this summer.

Just because your peaches have petals that look unaffected by the freeze doesn't mean the flower will develop properly. Thanks to Becky Carroll, Departmental Sr. Agriculturist of 28 years, for the photo tutorial!

Photos from Plant Disease and Insect Diagnostic Laboratory's post 03/12/2016

Hostas will start to emerge very soon. If you observe unusual line patterns or blotches that aren't typical of the cultivar, it might have Hosta Virus X. Plants with HVX should be removed.

Timeline photos 03/10/2016

We spend a lot of time in the PDIDL culturing from plant samples and identifying all the stuff that grows in the Petri dishes.

Photos from Plant Disease and Insect Diagnostic Laboratory's post 03/10/2016

Be sure to wrap samples in dry paper towels or newspaper. These okra roots were not wrapped and got moldy. However, we could still determine that they had root-knot nematode. Notice the unusual swellings on the roots?

Timeline photos 03/08/2016

If your plants have a lemon-lime color with darker veins, they may have a nutrient deficiency. Consider a soil test to determine soil pH. Elevated pH is often the source of the problem.

Timeline photos 03/07/2016

Pruning to remove weak and dead wood is recommended for trees like this. Wek and dead limbs are common entry points for pathogens and pests. Larger trees may require the skill of a certified arborist.

Photos from Plant Disease and Insect Diagnostic Laboratory's post 03/06/2016

Cercospora leaf spot on this Oakleaf Hydrangea is ugly! If you had the problem last year, be sure to remove fallen leaves and weak branches. It helps to apply mulch before plants break dormancy in the spring. Consider applications of preventative fungicides this spring.

Photos from Plant Disease and Insect Diagnostic Laboratory's post 03/05/2016

This afternoon, Jen Olson is speaking about Rose Rosette Disease at the Consulting Rosarian School and Winter Rose Workshop in Tulsa. Here's a look at RRD on White Out roses.

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