Time to Scout for Corn Rootworm Larvae
Neighboring states are reporting corn rootworm larval hatch - which means it is time for Iowa growers to scout and determine if a rescue treatment is needed.
Integrated Crop Management News
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Degree Days - Cool Weather Continues
By Rich Pope, Department of Plant Pathology
A third straight week of cooler than average weather has slowed crop progress across Iowa. Sporadic rainfall has limited field work, and for many fields weeds are a growing concern (pun intended). There has been slow weed response to herbicides, especially with glyphosate. The answer to this lies in getting some warmer weather to stimulate growth. So patience is a virtue.
Study Results Released - Weed Control in Roundup Ready® Cropping Systems
Results of a four-year multi-state weed research project are being released to help growers understand management practices in Roundup Readyr cropping systems.
June 15 Crop and Weather Report
By Doug Cooper, Extension Communications
Two words summarize the crop conversations this week — cold and weeds. Iowa State University Extension weed specialist Bob Hartzler, integrated pest management specialist Rich Pope, and soybean agronomist Palle Pedersen discuss the influence of both on Iowa crops during this week's crop and weather report.
Hartzler says the cool and wet weather is allowing weeds to get a jump on planted fields this spring. Farmers need to keep an eye on weed development to maintain maximum yields this year.
Take Time for Sprayer Cleanup
Good sprayer equipment cleaning practices should be part of responsible pesticide use.
Some Producers are Now Discovering Winter-Injured Hay Fields
By Stephen K. Barnhart, Department of Agronomy
Some producers apparently made their spring hay field winter injury assessment from afar because now they are finding that their hay fields are coming up short on stand density and hay yields.
Seedling Diseases Update
By XB Yang, Department of Plant Pathology
This spring's cool and wet weather, with accumulated degree days behind average, favors seedling diseases. Fungal pathogens have been reported to cause poor seedling stands in both corn and soybean fields .
Infected soybean seedlings are rotted and can easily be pulled from the soil. Infected corn roots are discolored, soft or mushy. Mesocotyles also may have a brown discoloration. Infected corn seedlings often appear yellow or stunted.
Soybean Rust Stirring in the South
Check points help researchers and producers anticipate the dispersal of soybean rust spores. Current distribution is mapped for easy tracking.
Spray Drift Potential Increases during Warm Weather Applications
As daily high temperatures increase into the upper 70s-80s F range, mid-day relative humidity frequently drops below 50 percent. This article takes a look at the effect of temperature and humidity on pesticide drift.
Corn Response to Postemergence Treatments
Uncharacteristically cold weather and general lack of good growing degree days is making corn more responsive to postemergence treatments.