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NC Iowa Agronomy Connection NewsletterSeptember 10, 2015 | Vol., 2 Issue 18

CornTop Die Back It's hard not to notice how much the corn has changed in the past 10 days. It looks morelike mid-October than the second week of September. Corn is dying from both the top andthe bottom with little to no green leaves in some fields. The 90+ degree temperatures oflast week plus all the stress of too much water in some places has pushed this issue evenfaster. Some of this is natural maturity, however, I delivered some samples to the lab atISU from John Holmes at North Central Coop in Clarion. The lab confirmed the presenceof Anthracnose Top Dieback, but because the fields are so uniform with these symptoms itis hard to believe this is all related to disease. Did the disease cause the issue or didsomething else cause this and the disease was secondary? Anthracnose Top Dieback isnot the only thing that cause those upper leaves to die prematurely.

Bob Nielsen from Purdue, wrote a good article several years ago talking about leafsenescence and top dieback.

Anthracnose Top Dieback is caused by the same fungus that causes anthracnose stalkrot. You will want to monitor fields for stalk quality by walking fields and pinching stalks or

Soil, Wind and Water

Squaw CreekWatershedOpportunities

Prairie Rivers ofIowa and local Soiland WaterConservationDistricts havepartnered to helpfarmers in theSquaw CreekWatershedimplement waterquality improvementpractices. TheSquaw CreekWatershedcomprises about147,000 acresacross Story, Boone,Hamilton andWebster counties. You can learn moreabout the goals forthe watershed andopportunities byvisiting the SquawCreek Watershed webpage, or by

moving stalks from side to side to gauge stalk strength. Be sure to check different hybridsand various places in the field. Fields with poor stalk strength should be scheduled firstfor harvest.

You should also gauge fields for lodging from rootworm feeding and also prioritize thosefields for harvest. In some places the rootworm feeding and the stalk quality will provide adouble whammy in terms of harvest challenges, not to mention our soil conditions. Moreon soil conditions in a future newsletter.

Events

September 10, 5:30-7:30 p.m. The Boone RiverWatershed is hosting a water quality field day atthe Arliss Nielsen farm, 3150 Hancock,Ave, Woodstock, IA. This field day will focus oncover crops, bioreactors, drainage watermanagement and replicated strip trials. TheIowa Soybean Association will provide a meal. The field day is open to all interested persons. Please R.S.V.P. to Bruce Voigts at 515-532-2165.

contacting thewatershedcoordinator, HannaBatesat hbates@prrcd.org.

You can also findmore information onthe Prairie Rivers ofIowa web Page.

Angie Rieck-HinzExtension Field Agronomist

Office: 515-532-3453Cell: 515-231-2830

Email: amrieck@iastate.eduTwitter: @nciacrops

ServingCalhoun, Cerro Gordo,

Franklin, Hamilton, Hardin,Humboldt, Webster,

Worth and Wright Counties.

Copyright © 2014 Iowa State University

Iowa State University Extension and Outreach programs are available to all without regard to race, color, age,religion, national origin, sexual orientation, gender identity, genetic information, sex, marital status, disability, orstatus as a U.S. veteran. Inquiries can be directed to the Director of Equal Opportunity and Compliance, 3280Beardshear Hall, (515) 294-7612.

Cooperative Extension Service, Iowa State University of Science and Technology, and the United StatesDepartment of Agriculture cooperating.

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