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The Source for Iowa Crop Production News

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. Questions have arisen if the phytotoxicity is more severe when ILeVo is used with pre-emergence herbicide treatments.

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.

Starter Fertilization Sometimes Boosts Corn Yield

3/20/2015 - Starter fertilizer can be used to complement pre-plant fertilization of crops to increase yield and economic returns to production. However, its use will not be beneficial in all production conditions.

Pay Attention to Stored Grain

3/18/2015 - Spring is the time to pay close attention to stored grain. This year, there is more wet corn in storage, and there has been a rapid weather switch from cold to warm. Check now and often to prevent future problems.

Black Cutworm Monitoring 2015: We Need Your Help!

3/13/2015 - Volunteers are needed for springtime cutworm moth data collection.

What is the Nutrient Value of Lost Organic Matter by Erosion?

3/6/2015 - The loss of organic matter and its nutrient value by erosion has significant effect on both the long-term sustainability of the soil nutrient pool and soil productivity. Nutrient availability in the soil to plants is inherently linked to the soil organic matter pool that is replenished through plant-animal-soil-atmosphere interactions, creating different pools of organic matter.

Effect of Residual Herbicides on Cover Crop Establishment

2/20/2015 - The interest in cover crops has increased recently due to the benefits they can provide to the corn-soybean cropping system. The use of residual herbicides has increased at the same time, and the potential impact these herbicides may have on establishing cover crops is an important consideration.

Evaluation of Commercial seed treatments on Soybean at Three Locations in Iowa in 2014

2/10/2015 - Seed treatments are becoming more and more commonplace on soybean. Moreover, the number of products available to treat soybean is increasing. In 2014, soybean seed treatment trials comparing 15 commercial products were completed at 3 locations in Iowa with funding from the Iowa Soybean Association. This article reports the results of those trials.

Field Experiments Show Effects of Clariva™ Seed Treatment in 2014

2/6/2015 - A new seed treatment, Clariva™ Complete Beans, is available to manage the soybean cyst nematode (SCN). Iowa State University personnel and staff of the Iowa Soybean Association On-Farm Network® conducted 24 experiments across Iowa in 2014 assessing the effects of the new seed treatment on yield and SCN soil population densities. Results are reported herein.

Wind Erosion in Iowa

1/27/2015 - Winter winds can cause soil erosion, resulting in the loss of top soil and organic matter. Cover crops and tillage can help reduce the amount of erosion that occurs during the winter months.