Insect And Disease Report

Sudden Death Syndrome Soybeans

Trying to predict this year’s insect and disease problems based on last season’s experiences can be a little dicey, as always. But experts are reading some signals that make them more optimistic about corn than soybeans.

Soybean Safety Questions

Indiana saw ideal planting conditions for soybeans in April, but cool, wet weather in May led to seedling blights and favored development of sudden death syndrome (SDS), says Kiersten Wise, plant pathologist with Purdue University. Some fields experienced serious yield losses. In fact, SDS was also widespread and severe in Iowa, Illi­nois, Minnesota, Wisconsin and South Dakota according to Extension plant pathologists in those states. Foliar symptoms of the disease were especially abundant in fields planted in April in Illinois and Indiana.

Wise also warns that Midwest fields with high levels of white mold of soybean in 2009 — planted back to the crop in 2011 — may be in danger. “We are concerned about the potential for disease development if the weather around flowering is cool and wet,” she says.

Resources Plentiful

Midwest universities offer a host of helpful tools for tracking pests in fields. Some publications that specialists recommended to us included:
•  “Soybean Diseases” from Iowa State University is a new comprehensive gathering of soybean disease and management information.
•  The “Purdue Pest & Crop Newsletter” helps growers and dealers scout fields and keep track of insect and other pest problems across Indiana. It’s available as a PDF sent weekly to subscribers.
•  The “Crop Observation and Recommendation Network Newsletter” (C.O.R.N.) offers current pest reports and can be found at http://agcrops.osu.edu.
•  A new online map to track the presence of South­ern corn rust and soybean rust in the U.S. is available at www.ipmpipe.org.

Carl Bradley, plant pathologist and Extension specialist with the University of Illinois, noted that charcoal rot hit Illinois, particularly to the south where very dry conditions prevailed. And soybean cyst nematode continued to rob yield from growers who are ignoring or mismanaging the pest, he says.

Growers across Illinois saw frogeye leaf spot, though generally not at damaging levels. But Bradley reports that strobilurin fungicide-resistant strains of this fungus were actually confirmed in Southern Illinois, as well as in Western Kentucky and Western Tennessee. “So it’s important that growers with a history of damaging levels of frogeye leaf spot manage the disease through resistant varieties rather than spraying a strobilurin fungicide,” he recommends.

Aphids Have New Friends

As Mike Gray, professor with the University of Illinois, puts it: “Last year was very unimpressive for major insect pest infestations of corn and soybeans throughout many areas of the Midwest.” Soybean aphid densities were very low — and are anticipated to be low again this season, he says. In fact, Gray says it will take almost ideal environmental conditions (mild summer) to promote outbreaks, and even if they occur, it will be late in the season.

Greg LaBarge, Extension educator with The Ohio State University in Northwest Ohio, does note that based on the every-other-year guideline for soybean aphid infestations, 2011 is an “on” year.

Gray says there are a few other insects to watch for in 2011. Some new stink bug species, including marmorated, red-banded and red-shouldered stink bugs, appear to be making their way across the Corn Belt.

Ron Hammond, field crop Extension and research entomologist with The Ohio State University, reports that brown marmorated stink bug has now been seen throughout Ohio. He anticipates this pest will increase in numbers and be a possible problem on soybeans in 2011. Erin Hodgson, entomologist at Iowa State University, explains that this stink bug punctures plant tissues such as leaves and stems and sucks on plant juices with its beak, similar to aphids or leafhoppers.

Turning To Corn

In corn, high levels of gray leaf spot (GLS) hit some fields in Indiana, reports Purdue’s Wise. “If these fields stay in reduced-tillage and continuous corn rotations, there is the potential for GLS to be more severe if the weather conditions are favorable for disease development,” she cautions.

GLS also caused damage in Illi­nois, as did Northern leaf blight, says Bradley. Unfortunately, some growers’ fields suffered major losses from Goss’s bacterial wilt. Hardest hit were fields that had suffered injury from earlier in the season, such as wind or hail damage. Goss’s wilt also caused damage to crops in parts of Iowa.

Ear rots, especially Diplodia ear rot, were seen in some areas that had sustained heavy rainfalls prior to and throughout silking, says Bradley, and stalk rots occurred in some areas, especially in fields that had severe leaf blights from gray leaf spot or Northern leaf blight.

Last season raised questions for Bradley about the effectiveness of corn hybrids with Northern corn leaf blight resistance. “In some cases where growers felt the resistant hybrids were not performing like they should, it’s possible a different race of the fungus was present,” he says.

Corn Feeders

Western bean cutworm (WBC) hit many Indiana fields in 2010, and “we would expect high numbers again this year, given the good overwintering conditions,” says Christian Krupke, entomologist at Purdue University. Risk factors include sandy soils, no-till fields and continous corn.

Krupke says scouting combined with pyrethroids applied at egg hatch achieve excellent control levels, as do Bt hybrids labeled specifically for WBC. The egg-laying period for this cutworm is from mid-June to mid-July, so that’s when scouting and/or treatment should occur, says Krupke. Once the WBC larvae enter the plant, they are not vulnerable to sprays.

Extension specialists are, in fact, tracking the eastward progress of this pest, says northwest Ohio State’s LaBarge. He’s seen some noneconomic feeding injury, but does not anticipate problems in his region in 2011. He’ll be paying closer attention to trap counts and corn growth stages.

There is some seriously good news on other corn insects: West­ern corn rootworm densities were some of the lowest Illi­nois’ Gray has seen in 20 years. Here again, it will take very favorable spring conditions (early planting, drier soil conditions in late May and early June) during hatch for them “to mount any kind of rebound.”

Krupke found the same kind of rootworm numbers in Indiana. “They were virtually absent in many fields where they were abundant just a few years ago,” he says. He credits a combination of Bt corn adoption and extremely wet springs that have drowned larvae.

Even more good news — increasing use of Bt corn has led to historically low populations of European corn borers.

Leave a Reply

Insecticides Stories

InsecticidesHow To Scout For Corn Earworms In Corn
July 28, 2014
In her weekly report, University of Missouri Agronomy Specialist Jill Scheidt discusses what to look for when scouting for corn earworm. Read More
InsecticidesEPA Grants Besiege Insecticide Additional Approvals
June 18, 2014
EPA has granted additional registration approvals for the use of Syngenta's Besiege insecticide on sorghum, cereal grains and peanuts. Read More
InsecticidesPrevathon Insect Control Approved For Cereal Crops
January 13, 2014
DuPont's Prevathon insect control powered by Rynaxypyr has received U.S. EPA registration for use on cereal crops, including wheat, most other small grains and sorghum. Read More
InsecticidesInsecticides 2014: Insect Pressure, Solutions On The Rise
January 2, 2014
Bt resistance, weather concerns and myriad other issues have led to an increase in both traditional pest pressures as well as new pests. Read More

Trending Articles

HerbicidesAdjusting To The New Reality Of Weed Control
November 4, 2014
Even with new cropping systems being readied for market introductions, weed control will remain a challenge for many. Read More
StewardshipResponsibleAg Begins Auditor Training
October 31, 2014
ResponsibleAg auditor training is now underway at the Ford B. West Center for Responsible Agriculture in Owensboro, KY. Read More
InsecticidesNew Research Study Shows The Value Of Neonics
October 29, 2014
The study evaluated seed treatment, soil and foliar uses of neonicotinoid insecticides in the U.S. and Canada. Read More
Crop InputsPlatform Specialty Products To Acquire Arysta LifeScience
October 20, 2014
Once the acquisition is complete, Platform Specialty Products will combine Arysta LifeScience with previously acquired companies Agriphar and Chemtura Crop Solutions. Read More
Seed/BiotechMonsanto Offers New Support For Ferguson, Area Communities
October 8, 2014
Monsanto Co. has committed $1 million in new support for several collaborative efforts in Ferguson, MO, and surrounding communities in North St. Louis County. Read More
Seed/BiotechUnapproved Genetically Modified Wheat Found In Montana
October 3, 2014
USDA reports that one year after discovery of Monsanto's unapproved wheat in a single Oregon field disrupted U.S. wheat export sales, the GMO wheat has again been found in Montana. Read More

Latest News

soybean field
Crop InputsABM Patents Microbial R&D Technique
November 25, 2014
Focused Microbial Diversity (FMD) is a newly patented technique employed by Advanced Biological Marketing (ABM) to research and develop microbials that will be used in ABM products Read More
Crop InputsStorage Options Help Grain Growers Go To Market
November 24, 2014
While on-farm storage in a traditional upright storage bin is one possibility for storing grain, it may not be for everyone. Read More
Eric SfiligojGiving Thanks For Another Great Year
November 24, 2014
As Thanksgiving Day 2014 arrives, agriculture has plenty to be thankful for. Read More
Crop InputsSyngenta Cost-Cutting Program To Affect 1,800 Jobs
November 24, 2014
The company's Accelerating Operational Leverage program will result in job reductions and relocations totaling around 1,800 across the company, the majority of which will occur in 2015. Read More
EquipmentAGCO Announces Operator Of The Year Finalists
November 20, 2014
Four custom applicators have been selected by AGCO Application Equipment as finalists for 2014 Operator of the Year, an honor that recognizes them as being among the top professionals in their industry throughout North America. Read More
MicronutrientsH.J. Baker Expands Tiger-Sul Business
November 20, 2014
H.J. Baker has created and filled two strategic positions in business development and sales within its Crop Performance Division. Read More
soybean field
FertilizerGeneral Mills Honors United Suppliers For Nitrogen Opti…
November 19, 2014
United Suppliers winning proposal detailed SUSTAIN, a consulting network that provides customized products and services for farmers using a needs-based system approach. Read More
EmployeesOhio AgriBusiness Association Awards $25,000 In Scholar…
November 19, 2014
Each year, the Ohio AgriBusiness Association Educational Trust scholarship program awards scholarship dollars to students enrolled in an agriculture-related field attending several state colleges. Read More
ManagementServi-Tech Names New CEO
November 17, 2014
Servi-Tech has named Greg Ruehle its new president and CEO. Read More
CropLife 100Pinnacle Ag Acquires Colorado Aerial Application Outlet
November 17, 2014
Ft. Lupton, CO-based Reck Aviation — a full-service chemical application company providing aerial crop applications of fertilizers and crop protection products — will operate as part of Pinnacle's AgOne Application Services brand. Read More
Eric SfiligojMcDonald’s Message: Biotech Crops Scarier Than Cancer
November 17, 2014
Despite their potential health benefits, one of the world’s largest potato users will pass on a new biotech offering. Read More
MicronutrientsWinField Releases 2014 NutriSolutions Results
November 14, 2014
A number of significant regional and national crop deficiency trends emerged from the 2014 WinField NutriSolutions tissue sampling program. Read More
FertilizerH.J. Baker Opens Chinese Production Lines
November 14, 2014
The occasion was the official launch of the Tiger-Sul sulphur Bentonite production line of two much anticipated fertilizer products in China, T90CR sulphur fertilizer and TZinc micronutrient enhanced sulphur fertilizer. Read More
ManagementOhio Certified Crop Adviser Program Accepting Nominatio…
November 14, 2014
The award recognizes an individual who delivers exceptional customer service for farmer clients in nutrient management, soil and water management, integrated pest management and crop production in Ohio. Read More
HerbicidesSyngenta Announces Acuron Trial Plot Results
November 14, 2014
Acuron was tested at 167 trial locations across 35 states. Trials included 95 Syngenta locations, 54 university locations and 18 distributor locations. Read More
Crop InputsVerdesian Expands Sales Force
November 13, 2014
The new sales representatives will work with growers, retail partners and distributors to oversee technical training and product education. Read More
EquipmentAGCO Raises $100K For Wounded Warrior Project
November 13, 2014
AGCO Corp. partnered with local AGCO dealers across the U.S. and Canada to raise nearly $100,000 in support of wounded service veterans. Read More
HerbicidesDow AgroSciences Announces Launch Of Enlist Duo Herbici…
November 12, 2014
It will be launched in conjunction with a stewarded introduction of Enlist corn, and seed production of Enlist soybeans in 2015. Read More