Look out for cereal aphids in wheat

decrease font size  Resize text   increase font size       Printer-friendly version of this article Printer-friendly version of this article

Colonies of bird cherry-oat aphid were spotted in winter wheat at Draper in South Dakota last week. As winter wheat is heading toward booting stage, careful monitoring of populations by frequent scouting is highly recommended. Cereal aphids are the most common sucking pests of wheat in South Dakota. There are three different species that are frequently spotted in South Dakota: bird cherry-oat aphid, English grain aphid, and greenbug. Among the three, bird cherry-oat aphid appears first in the season as it has the ability to overwinter in South Dakota whereas the other two fly into the state from the south and thus appear late in the spring season.

North Dakota State UniversityFigure 1. Greenbug, bird cherry-oat aphid, and English grain aphid. The bird cherry-oat aphid is dark green with a rusty patch at the tail end near the cornicles (spine like structures); greenbug is bright green with a dark stripe on its back; and the English grain aphid is plain green to brown with no markings and long black cornicles (Figure 1). Although severe losses due to aphid feeding in South Dakota do not occur often, aphids have the potential to cause significant yield losses when favorable climate is coupled with high aphid populations.

Aphids have a tremendous ability to multiply as they reproduce without mating and can double their populations in 2 to 3 days. Damage due to aphids is two-pronged: direct damage caused by sucking on plant sap weakening the plant and affecting the yield and indirect damage by transmitting barley yellow dwarf virus. Of all three species, greenbug is known to cause the most damage as they inject a toxin during feeding that causes yellowing and stunting of plants.

click image to zoom Scouting should be done by taking aphid counts on individual stems by looking on both sides of the leaves. Usually aphid colonies start from lower leaves and the easy trick is to look for ants that get attracted to the sweet secretions of aphids. Economic thresholds for cereal aphids have been determined for all the three species (Table 1). However, irrespective of species, if 85% of sampled stems have one or more aphids at early stages of wheat development or 12 -15 aphids per stem at or before heading pesticide treatments are recommended. Before making spray decisions check for predators such as lady beetles, lacewings, hover flies, minute pirate bugs, and parasitic wasps that play a major role in suppressing aphid populations.

For the list of insecticides that are labelled for application on wheat aphids in South Dakota, view the SDSU Extension 2013 South Dakota Crop Protection Guide: Wheat Insecticides Table publication.


Buyers Guide

Doyle Equipment Manufacturing Co.
Doyle Equipment Manufacturing prides themselves as being “The King of the Rotary’s” with their Direct Drive Rotary Blend Systems. With numerous setup possibilities and sizes, ranging from a  more...
A.J. Sackett Sons & Company
Sackett Blend Towers feature the H.I.M, High Intensity Mixer, the next generation of blending and coating technology which supports Precision Fertilizer Blending®. Its unique design allows  more...
R&R Manufacturing Inc.
The R&R Minuteman Blend System is the original proven performer. Fast, precise blending with a compact foot print. Significantly lower horsepower requirement. Low inload height with large  more...
Junge Control Inc.
Junge Control Inc. creates state-of-the-art product blending and measuring solutions that allow you to totally maximize operating efficiency with amazing accuracy and repeatability, superior  more...
Yargus Manufacturing
The flagship blending system for the Layco product line is the fully automated Layco DW System™. The advanced technology of the Layco DW (Declining Weight) system results in a blending  more...
Yargus Manufacturing
The LAYCOTE™ Automated Coating System provides a new level of coating accuracy for a stand-alone coating system or for coating (impregnating) in an automated blending system. The unique  more...
John Deere
The DN345 Drawn Dry Spreader can carry more than 12 tons of fertilizer and 17.5 tons of lime. Designed to operate at field speeds up to 20 MPH with full loads and the G4 spreader uniformly  more...
Force Unlimited
The Pro-Force is a multi-purpose spreader with a wider apron and steeper sides. Our Pro-Force has the most aggressive 30” spinner on the market, and is capable of spreading higher rates of  more...
BBI Spreaders
MagnaSpread 2 & MagnaSpread 3 — With BBI’s patented multi-bin technology, these spreaders operate multiple hoppers guided by independent, variable-rate technology. These models are built on  more...


Comments (0) Leave a comment 

Name
e-Mail (required)
Location

Comment:

characters left


Portable Conveyors

Convey-all portable conveyors are designed to handle your crops gently and efficiently. We offer an extensive line of high capacity ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form