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The Source for Iowa Crop Production News

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Update on Northern Corn Leaf Blight in Iowa

7/9/2015 - Northern corn leaf blight continues to develop across Iowa and may require a fungicide treatment for management. It is important to scout fields that otherwise look healthy from the road.

Hail and Fungicide Use on Corn

6/30/2015 - Three-year study of hail damage shows decreased yield when hail events occur, yet hail-injured corn plants may have less disease than plants without hail injury.

True White Grub Identification and Management

6/30/2015 - Stunted and wilted corn plants could be the result of grub feeding. Although rescue treatments are available, true white grubs have a multi-year life cycle and should be scouted to protect future crops.

How’s Your SCN Resistance Holding Up?

6/22/2015 - Most SCN-resistant soybean varieties possess the same set of resistance genes from a breeding line called PI 88788. After years of repeated use, many SCN populations in Iowa have increased ability to reproduce on the common PI 88788 SCN resistance. The situation is discussed in this article as well as tips on how to check to see if it is happening in fields.

In-Season Corn and Soybean Forecast of Soil Water-Nitrogen and Yields for Central and Northwest Iowa: A Pilot Project

6/16/2015 - Pilot project is using APSIM model to forecast soil water-nitrogen and end-of-season corn and soybean yields in central and northwest Iowa. The June 15, 2015 forecast indicates corn yields to be near the long-term average and soybeans to be slightly below the long-term average.

Diseases Showing Up in Iowa Corn

6/16/2015 - Within the past week several foliar diseases have been reported in Iowa.

Japanese Beetles Begin Emergence

6/16/2015 - Japanese beetles have a wide host range, including corn and soybean. Adult emergence is starting in southern Iowa this week. Scout corn before pollination to make treatment decisions.

Southeast Research and Demonstration Farm Field Day is June 23, 2015

6/10/2015 - Annual event provides certified crop advisors and farmers with soil and water management training and an opportunity to earn CCA credits.

Equisetum: From the Ditch to the Field

6/9/2015 - Scouring rush and field horsetail are two species in the Equisetum genus. Although neither weed is highly competitive with corn or soybean, over time they can get dense enough to interfere with production.

Nitrogen Issues So Far This Spring

6/9/2015 - To date, there have not been many weather-related issues with nitrogen (N) management, unlike recent years. There have been a few reports of damage to corn seedlings from spring applied anhydrous ammonia. However, precipitation has kept soils moist this spring which reduced damage potential.

Corn Rootworm Egg Hatch is in Progress

6/9/2015 - Corn rootworm egg hatch is happening throughout Iowa and has reached a peak in southeastern counties. Assess larval feeding activity to make future management decisions.

Online Review Course for Iowa Certified Crop Adviser Exam Now Available

6/3/2015 - Iowa State University Extension and Outreach with support from the Iowa Certified Crop Advisers Board has developed an online review course for individuals taking the Iowa CCA Examination.

Get to the Root of the Problem: An Easy Way to Check for SCN

6/3/2015 - After 35 years, SCN continues to be the most damaging pathogen of soybeans in Iowa and the Midwest. Digging soybean roots to check for the presence of SCN females is an easy and effective way to scout for this serious pest.

Corn Fungicides: To Spray or Not to Spray?

6/3/2015 - Across the state of Iowa, much of the crop is reaching V5 to V6 and thoughts of an early fungicide application have probably crossed some people’s minds. This article evaluates the results of corn fungicides trials on Northern corn leaf blight (NCLB) from 2014.

Summer Field Day Scheduled for ISU Northern Iowa Research Farm

6/2/2015 - On June 25, a summer field day in Kanawha, Iowa will focus on crop management, nitrogen management, and crops grown for an energy source. The event is sponsored by Iowa State University and Northern Iowa Research Farm Association.

Check for Wireworm Injury When Assessing Corn Stands

5/28/2015 - While assessing corn stands for black cutworm and armyworm feeding, also consider assessing for wireworm activity. Wireworms injury can leave plants looking wilted or stunted, sometimes even leaving gaps in stands.

Iowa State University Weed Science 2015 Field Day

5/28/2015 - The 2015 Weed Science Field Day is scheduled for Thursday, June 25 at the Curtiss Farm at 2219 State Ave. in Ames. The self-guided field day will begin at 8:30 a.m. and is open to the public.

Stalk Borers Begin Migration to Corn

5/28/2015 - Common stalk borers are moving to corn in southern Iowa.

True Armyworms Defoliating Corn Seedlings

5/26/2015 - Scouting for adult true armyworms should occur in May and June in fields that are minimum, no tilled, or contains a cover crop. Feeding occurs on the lower corn leaves and moves upwards, but true armyworms do not bore into stalks.

Soybean Seedling Damage: Is There an Interaction Between the ILeVO Seed Treatment and Pre-Emergence Herbicides?

5/22/2015 - Cool, wet conditions have led to soybean seedling damage that appears similar seedling blights such as Pythium; however, the damage may be caused by a combination of cool, wet conditions, ILeVO seed treatments, and the application of pre-emergence herbicides.

UAN and Herbicides on Emerged Corn

5/14/2015 - Corn planting progressed so quickly in many parts of the state that herbicide applications couldn’t keep up with the planters. Consider options before applying UAN.

Black Cutworm Scouting 2015

5/14/2015 - Scouting for black cutworm larvae helps to determine if an insecticide application will be cost effective.

Waterhemp’s Big, Bad Brother is Back This Spring

5/10/2015 - Palmer amaranth’s presence in the state is currently confirmed in five counties. Keep an eye out this summer for this weed with Iowa State’s identification resources.

Black Cutworm Moths Captured Throughout Midwest

4/24/2015 - Traps for black cutworm moths placed around state help determine when to scout for this corn pest.

The Iowa Monarch Conservation Consortium

4/21/2015 - The Iowa Monarch Conservation Consortium was established in February 2015 with a long-term goal to lead efforts in the recovery of the monarch butterfly without impacting the productivity of Iowa’s cropland.

Crop Scouting Competition 2015: Open for Enrollment

4/20/2015 - Registration for Crop Scouting Competition for Iowa Youth on August 4, 2015, is now open. Schools, clubs, or other organizations are invited to enter their team of three to five participants.

Using the Soybean Planting Decision Tool to Help Make Planting Date and Maturity Selection

4/15/2015 - Soybean Planting Decision Tool developed as a decision aid to help farmers and agronomists choose soybean maturity and planting dates. The tool can also be used to understand soybean growth and maturity interactions with date of planting.

Corn Suitability Rating 2 Equation Updated

4/15/2015 - The equation for calculating Iowa’s Corn Suitability Ratings (CSR) was recently updated and designated Corn Suitability Rating 2 (CSR2). The updated equation provides every user an opportunity to calculate the rating for each soil map unit identified in Iowa.

Alfalfa Weevils Active Throughout Iowa

4/14/2015 - Adult alfalfa weevils begin moving as soon as temperatures exceed 48°F and begin laying eggs in alfalfa.

Predicted Mortality of Bean Leaf Beetle is Highly Variable

4/14/2015 - Each spring, adult beetles emerge from overwintering habitat and migrate to available host plants, such as alfalfa, tick trefoil and various clovers.