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Crop Scouting Report - July 24, 2019

Fields scouted NE of Liberal and south of Mindenmines.

Corn in the milk stage. Southern rust has been confirmed in SW Missouri in Barton County. Gray leaf spot is in all fields scouted. When considering a fungicide, leaves at and above the ear are most important to protect. Leaves at ear level and above are responsible for at least 60 percent of grain fill- https://www.agry.purdue.edu/ext/corn/news/timeless/GrainFill.html Given the wet conditions, consider a fungicide at tassel. It is important to differentiate between common and southern rust, as southern rust can cause significant yield loss. Common rust has brick red pustules, sparsely scattered on the upper and lower leaf surface. Southern rust has orange pustules, densely clustered on the upper leaf surface only. Mid-May or later planted corn is at higher risk for yield reduction from southern rust. Fungicide applications for southern rust are beneficial even with corn in the milk stages. Follow the southern rust movement at https://corn.ipmpipe.org/southerncornrust/.

 In flying over Missouri, Peter Scharf, MU state fertility specialists estimates SW Missouri has had the most nitrogen loss, and estimated a 20 bushel/acre yield reduction.

 Soybeans ranged from emerging to early bloom. Less than 5% foliage feeding was observed. Threshold level for all foliage feeding insects in soybeans are 30% defoliation before bloom and 20% defoliation during or after bloom. Small water hemp was present in most fields, for most effective control, treat weeds when they are 2-4” in height or diameter.

 Health tip: In general, sunscreen is effective for up to 3 years. It is recommended to wear a minimum SPF of 30.

Crop Scouting Report - July 17, 2019

Fields checked near Avilla.

Soybeans in the first trifoliate, some scattered plants throughout the field were clipped. Insects were not present at the time; when looking for caterpillars, look for holes near the plant and carefully dig in the soil up to 2” deep around the plant to find them.

If considering replanting soybeans keep in mind that hard rainfall events after planting (especially in tilled fields) can cause a crusting which can affect soybean emergence. Watch the weather forecast prior to planting and don’t plant in too wet of soils.

Corn was in the milk stage. Common rust and gray leaf spot were found. Leaves at and above the ear are most important for yield. If disease is present on these leaves in a dense amount, consider a fungicide.

Southern rust has been confirmed in SE MO and SE KS. Mid-May or later planted corn is at higher risk for yield loss from southern rust. When scouting for rust, common rust will typically be on the upper and lower leaf surface, and pustules are brick red, southern rust is only on the upper leaf surface, with orange colored pustules.  Follow the southern rust movement at https://corn.ipmpipe.org/southerncornrust/

Keep in mind that late planted corn requires fewer growing degree days to reach maturity than corn planted at optimal time due to the warmer days this time of year. The days to maturity rating on a hybrid does not refer to literal calendar days, it is dependent on temperature. Later planted corn will reach maturity in less calendar days.

http://www.aganytime.com/Documents/ArticlePDFs/Corn%20Growth%20Stages%20and%20GDUs%20-%20DEKALB%20Spotlight.pdf

https://www.agry.purdue.edu/Ext/corn/news/timeless/HybridMaturityDelayedPlant.html

     

Visit the MU Extension flood resource site for information on crop and pasture conditions.

 

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