Home » Uncategorized » Greenbugs and Bird Cherry-Oat Aphids in Wheat: Decisions…

Greenbugs and Bird Cherry-Oat Aphids in Wheat: Decisions…

About Me

Amanda De Oliveira Silva

Amanda De Oliveira Silva

I have served as an Assistant Professor and Small Grains Extension Specialist at Oklahoma State University since August 2019. I believe that close interaction with producers is vital to understand their production strategies and to establish realistic research goals. My program focuses on developing science-based information to improve the agronomic and economic viability of small grains production in Oklahoma and in the Southern Great Plains.

View Full Profile →

Enter your email address to follow this blog and receive notifications of new posts by email.

Join 3,571 other followers

This article was written by Dr. Tom A. Royer, Extension Entomologist


Heath Sanders, OSU southwest area agronomist, reports of some wheat fields infested with bird cherry-oat aphids. I have seen low levels of greenbugs in some of our demonstration plots as well. The decision to control aphids is especially important right now so a producer can decide to add an insecticide with their top-dress fertilizer. Greenbug infestations results in visible injury to the plants, but bird cherry-oat aphid infestations do not produce visible damage and may go unnoticed.


My suggestion is to scout the field beforehand to determine if there are GROWING numbers of either aphid that could be of concern. While scouting, keep track of Lysiphlebus mummies. Glance n’ Go accounts for aphid parasitism from Lysiphlebus wasps. If 5-10% of bird-cherry oat aphids are mummies, more than 90% of the rest are also parasitized, and control is probably not warranted.


If greenbugs are present, use Glance n’ Go to scout. At current prices of $3.00 or $4.00 per bushel, and control costs of $4.00 to $10.00 per acre, you should select the spring Glance n’ Go forms on this link: http://entoplp.okstate.edu/gbweb/spring%20glance%20n%20go3.htm using the following guidelines:


If aphids are mostly bird cherry-oat aphids, count the number of aphids on each of 25 randomly selected tillers across a zigzag transect of the field and note mummy activity. Unpublished research provided by Dr. Kris Giles (OSU) and Dr. Norm Elliott (USDA-ARS) combined with studies on spring wheat from the Dakotas and Minnesota indicate that 20-40 BCOA per tiller causes 5-9% yield loss before wheat reaches the boot stage. My suggestions: if BCOA numbers average 10-20 per tiller, figure on a 5% loss, if 20-40 per tiller, figure a 7% loss, and if BCOA aphids are more than 40 per tiller, figure a 9% loss.



Here is a Table of Preventable Loss estimates for bird cherry-oat aphids for expected yields of 30 to 50 bushels per acre, expected wheat prices of $3.00, $3.50, and $4.00 per bushel, and bird cherry-oat aphid numbers of 10-20, 20 to 40, and over 40 per tiller.


Check  CR-7194, “Management of Insect and Mite Pests in Small Grains” for registered insecticides, application rates, and grazing/harvest waiting periods. It can be obtained from any Oklahoma County Extension Office, or found at the OSU Extra Website at http://pods.dasnr.okstate.edu/docushare/dsweb/Get/Document-2601/CR-7194web2008.pdf

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: