Plant and Insect Diagnostic Clinic Update - August 22, 2014

The following are highlights and updates about samples and questions recently received in the Plant and Insect Diagnostic Clinic. Visit the PIDC's Facebook page to ask questions and for updates and more pictures.

 

Insects

It's another good year for ground crickets.  These very small (3/8 inch long) crickets are frequently abundant at night under lights and in the lawn.  See more in HHPN, August 11, 2010.

 

It's time to notice yellowjacket wasps!  Nests in wall voids may be discovered when the wasps wander inside.  Outdoors, mowing and other "disturbing" activities may bring out yellowjackets to investigate what you are up to and to discourage you from doing it again!  Use insecticide dust into the nest opening at night when control is warranted.

 

Diseases

 

We have been receiving many bur oak blight samples.  The weather this year was conducive for symptom development.

 

Arborvitae continue to have problems.  Weather related stress is the primary cause of problems.  Stressed trees are more prone to insect and disease problems, so we have received samples with spider mite damage, scale insects, and Kabatina tip blight.

 

Authors: 

Links to this article are strongly encouraged, and this article may be republished without further permission if published as written and if credit is given to the author, Horticulture and Home Pest News, and Iowa State University Extension and Outreach. If this article is to be used in any other manner, permission from the author is required. This article was originally published on August 22, 2014. The information contained within may not be the most current and accurate depending on when it is accessed.