Corn damaged by hail. Photo: University of Minnesota
While parts of western Iowa appear to be lacking rain or receiving small amounts of rain, other parts of the state received more than 3 inches of rain last week and experienced flooding. Unfortunately, some areas, especially southwest and south-central Iowa, also suffered extensive hail damage, which resulted in some fields being replanted.
Where conditions were favorable last week, there was a lot of post-herbicide application, spreading and closing of the first cut of hay. Read on to hear what ISU’s extension field agronomists are hearing and seeing across the state.
Gentry Sorenson (Region 2): “Rainfall has been patchy for the week with around 0.5 inches of rainfall across the region. Post herbicide application was before the rain with the main focus being on corn post applications. The corn is in the V5 to V6 growth stage.The lateral nitrogen treatment of the corn is in progress as growers work to complete as the corn is growing rapidly.
“The soybeans are at an average growth stage of V2. Post-emergence soybean applications have just begun as the deadline for applying dicamba after soybean emergence is June 20. Phone calls and field calls were for herbicide application, late season nitrate testing, and cover crop shutdown.
Josh Michel (Region 5): “Post-emergence herbicide applications and side dressing applications were the main activities carried out last week as farmers took breaks between scattered rain showers. Over the past week, most of the region has received 1.0 to 1.5 inches of rain, but some isolated areas in parts of northern Allamakee and Winneshiek counties have received up to 3 inches of rain.
“In addition, over the weekend, a strong line of storms moved through southern Buchanan County delivering up to 4 inches of rain to isolated areas. About 90 percent of the corn has emerged and can be scaled from VE to V5 in some early planted fields. Many fields received post-emergent herbicide applications as well as parallel fertilizer applications.
“Now is the time to look for real army worms, as I have had a few calls for a feed. About 80 percent of the soybeans have emerged and can be staged from VE to V3. Like corn, many fields of soybeans received their first post-emergent herbicide applications.
“Many oat fields are coming out and doing well so far. The end of the first alfalfa harvest ends. The new regrowth after the first harvest looks good so far due to constant rain showers. Pastures continue to look good, although very warm temperatures this week will put a strain on cool season grasses.
“Recent calls and questions from the field have focused primarily on weed management, herbicide applications, small grain and forage management, and questions about fertilizer applications.”
Aaron Saeugling (Region 10): “Heavy rain and hail covered parts of southwestern Iowa last week, causing extensive damage to fields. Replanting began this week with soybeans and corn being replanted in parts of Pottawattamie, Cass, Adair, Adams, Montgomery and Union counties.
“The smaller maize will survive because the growing point was under the ground. Soybean stands have been reduced to less than 50,000 in many fields, warranting replanting in many cases. Corn growth stages range from V2 to V7 and soybeans from V1 to V4. Some narrow row beans planted early should close the rows by the end of the week. Early and narrow row corn will also close the row this week as well.
“Most of the corn poles are coming out and the urea has been applied or will be soon. With warm temperatures forecast, I expect crops to pick up some growth due to seeding later this year.
“Insects to watch include black cutworm damage in the fields, and I expect Japanese beetles to appear in the coming weeks. Although moisture conditions are adequate now, we will need rainfall in late June and early July this year due to shallower root systems.
East-Central, Southeast, and South-Central Iowa:
Rebecca Vittetoe (Region 8): “Overall the crops are looking really good in this part of the state. The corn is mostly at the V4 to V6 stages, with some V7 corn. Soybeans mostly fall into growth stages V1 to V3. Field activities over the past week included nitrogen application, post-emergence herbicide applications and hay placement.
“We had rain last week with totals ranging from 0.5 inches to some isolated areas receiving over 2 inches. Some areas had corn leaning due to some winds that accompanied the rain, but it appears to have straightened out nicely.
“The pest issues were mainly black cutworms, but as you scout, keep your eyes peeled for stalk borers entering the corn and Japanese beetles soon starting to emerge. One of the biggest concerns as we head into this week is the hot temperatures, the wind, and the hard balancing act after herbicide applications.
“Questions or field calls over the past week included herbicide applications, insects (mostly black cutworms), herbicide injury symptoms, and some sulfur deficiency in corn.”
Virgile Schmitt (Region 9): “Precipitation last week in the counties I cover was extremely variable, ranging from 0.2 to over 3.0 inches. In general, temperatures over the past week in the counties I cover were a one degree below to three degrees above normal Most corn is V5 to V6 and looks good to excellent.
“A lot of fertilizer spreading and post-emergent herbicide spraying has taken place in the past week. Most soybeans are V1 to V3 and also look good to excellent. The alfalfa harvest is almost complete and the oats are coming out. The calls over the past week were mostly about weed management and herbicide damage.
Clara Bell Probasco (Region 11): “Much of south-central Iowa received heavy rain this past week. Along with a few of the rain systems, a few small pockets of hail occurred where soybean fields had suffered enough damage to replant or knock down additional soybeans.
“The vast majority of corn fields were well below the V5 stage, avoiding damage to the growing point. Rainfall amounts were observed between 1.5 inches and over 4 inches. Corn fields can be seen in stages from V1 to V6 and soybean fields are seen between VE and V3.
“There has been bean leaf beetle activity throughout the region as well as a few sporadic cases of black cutworm. Be sure to continue to monitor fields for pest damage! »