Drought conditions experienced during grain fill often increase the potential for stalk rot and lodging problems in corn. When stalk rot occurs late in the season as it often does, it may have little or no direct effect on yield. However, stalk lodging, which results from stalk rot, can have such an impact on harvest losses that many plant pathologists consider stalk rots to be the most significant yield-limiting disease of corn....More
The 2012 growing season, with mid-season conditions that favored kernel set followed by conditions that favored plant stress, was ideal for the development of stalk rots, says University of Illinois Extension Educator Angie Peltier. “Stalk rots increase lodging potential, which can decrease harvestable yield and leave much of it on the ground. Corn plants are top-heavy, and stalk rots increase the chances that plants will fall over, or lodge, due to gravity or wind and weather events,” she explains....More
Heat and drought in the Corn Belt have created the perfect conditions for Aspergillus ear rot to develop in corn grain and silage – something Purdue Extension plant pathologists say grain and livestock producers need to prepare for. The disease is caused by a fungus that produces aflatoxin, a toxic carcinogen for livestock that consume contaminated grain or silage....More
There continues to be lots of questions about whether plant-parasitic nematodes are causing damage to Iowa’s corn crop. This varied group of microscopic worms has some species that cause damage to corn at very low population densities (numbers) and other species that are not harmful until population densities reach many hundred or more per 100 cm3 (a little less than a half cup) of soil....More
Bill Curran has devoted 18 years to a mystery that’s new to many of us. As lead scientist for Pioneer’s LaSalle, CO, Goss’s wilt hybrid development and screening program, he preaches prevention because there is no remedy....More
As the tough 2011 cropping year draws to a close, farmers can take solace in knowing that despite unfavorable weather conditions, corn molds don't seem to be of widespread concern, says Charles Woloshuk, a Purdue University plant pathologist....More
The combination of a late harvest and wet weather could mean optimal conditions for development of corn ear molds, according to Ohio State University Extension Plant Pathologist Pierce Paul, a leading researcher of disease issues in corn and wheat at the Ohio Agricultural Research and Development Center (OARDC). He says the longer corn stands in the field under wet conditions, the higher the risk that molds will develop....More
It is already the first week of October and most of the corn in Ohio is still not ready for harvest. Some of the earlier-planted fields are being harvested, but at relatively high moisture levels. This is causing some concern among producers as to the potential for ear rot and mycotoxin problems....More
Goss' wilt, a corn bacterial disease historically confined to the Great Plains has spread to several states in the Midwest and is moving north and east. According to crop experts at Pioneer Hi-Bred, a DuPont business, the disease has spread across Iowa and into Illinois, as well as southern Wisconsin, Minnesota and the Dakotas. Growers in these states who haven't yet encountered the disease should consider minimizing their risk to Goss' wilt in the coming planting seasons....More
As the old adage goes, “All that glitters is not gold.” Likewise, all that glitters is not Goss’ wilt this growing season. “When a disease that has occurred only sporadically in past seasons suddenly becomes a big player, worries and conjecture abound,” says Suzanne Bissonnette, University of Illinois (U of I) plant clinic coordinator....More
Goss' leaf blight and wilt of corn is a damaging disease that is new to Minnesota and has caused problems in fields over the past two years. The weather conditions this summer may favor development of this disease again. It was reported from two fields in southern Minnesota in the past week, and it may start to develop in many fields....More
Goss' wilt is making a widespread appearance across Illinois, says Suzanne Bissonnette, director of the University of Illinois Plant Clinic. Tests have now identified Goss' wilt in Sangamon, Knox, Livingston, Bureau, Edgar, Shelby, Woodford and Piatt counties.
"In the past two weeks, we've received numerous field corn leaf samples as growers and agriculturalists are noticing the dramatic symptoms in fields across the central and northern parts of the state," she says....More
Reports of late planting, flooding and saturated soils are inundating news sources right now, and corn growers need to take them seriously. All of these conditions will likely have an effect on which pests and diseases show up in your cornfields. Extension specialists advise keeping a close eye on crops as they emerge....More
Macon LaFoe knows it’s not if his soybeans and corn will face big pressure from cercospora,but the proverbial when. However, fungicide treatments can KO the disease and could also produce higher yields.
Cercospora is nasty fungus that comes in several variations, which can prevent beans from maturing properly and cause gray leaf spot in corn. Left uncontrolled, the disease can ruin leaves, thwart ears, lead to lodging of weak stalks on corn and decrease soybean yields 25% or more....More