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July Agronomy Update

Fungicides for Corn

Because of the abnormally hot and wet weather this spring and early summer we may see higher incidences of foliar diseases later on in the season.  Corn typically has pretty good disease tolerance prior to tassel emergence.  That tolerance declines once the plant goes into and through the reproductive stage to senescence.
There are two common classes of fungicides:
Triazoles (Tilt).   Triazoles are more curative.  They provide control after infections have already begun (before you can see the lesions) and are non-systemic.
Strobilurins(Headline) are protectants.  They provide control prior to disease onset.  They control a broder range of diseases and offer longer lasting residual control.  Strobilurins are more systemic than Triazoles.
Quilt and Stratego are a combination of both Triazoles and Strobilurins at a lower active ingredient of each.

Headline Fungicide

Headline® fungicide helps growers control diseases and improve overall Plant HealthPerhaps that's why Headline fungicide is the nation's leading fungicide.

How Headline Fungicide Works

Headline fungicide is a fast-acting, broad-spectrum fungicide that delivers a high level of activity on more than 50 major diseases that can threaten yield and crop quality. Headline fungicide helps prevent diseases and provides protection for more than 90 crops, including corn, soybeans and wheat.
Not only does Headline fungicide provide excellent disease control, it actually promotes improved Plant Health. The unique chemistry of its active ingredient, F500®, enables more efficient nitrogen uptake, more robust plant growth and better stress tolerance to heat, hail, wind and drought. Ultimately, this means healthier plants and higher yield potential.
Growers who use Headline fungicide for disease control report more vigorous plant growth and stress tolerance advantages such as better standability and improved harvest efficiency — helping to reduce losses and improve ROI.
Note the “Headline – Application Guidelines” chart and be aware of applying Headline prior to the VT stage, this is critical to prevent yield loss.  VT stage is identified as the last tassel branch fully visible outside of the whorl.  No adjuvant is recommended for either ground or aerial application before VT and if the grower chooses to have a fungicide applied by air before VT stage then it must be in at least 5 gallons of water per acre.  The optimum window for application extends from VT stage through R2 (early brown silk).  Many fields are showing uneven growth this year.  Those fields will be coming into the VT stage at various times.  Growers will need to work with the individuals that apply the product to their fields for timing of application and the use of adjuvant and carrier rates.Note the “Headline – Application Guidelines” chart and be aware of applying Headline prior to the VT stage, this is critical to prevent yield loss.  VT stage is identified as the last tassel branch fully visible outside of the whorl.  No adjuvant is recommended for either ground or aerial application before VT and if the grower chooses to have a fungicide applied by air before VT stage then it must be in at least 5 gallons of water per acre.  The optimum window for application extends from VT stage through R2 (early brown silk).  Many fields are showing uneven growth this year.  Those fields will be coming into the VT stage at various times.  Growers will need to work with the individuals that apply the product to their fields for timing of application and the use of adjuvant and carrier rates.

Time to scout and manage western bean cutworm in southern Michigan

Scouting for this pest isn’t too difficult. Western bean cutworm egg masses are large, initially white and laid on the upper third of pre-tassel plants. With some practice, they are easy to spot, especially if you put the sun behind the corn leaves and look for their shadows.
According to MSU Extension entomology specialist Christina DiFonzo, when scouting for western bean cutworm, count 20 plants at five different locations. Since the eggs hatch (Figure 6) in a week or so, they should keep a running total of how many masses they see each week. The treatment threshold is five percent of plants with egg masses.
A common pyrethroid (the “-thrins”) insecticide such as Warrior (lambda-cyhalothrin) will control western bean cutworm larvae and typically provide 10–14 days of residual activity. Once the larvae have “fattened up” on pollen packets in the tassels and made their way back down the plant and into the ear, control is all but impossible.

Soybean Frogeye Leaf Spot

Fungicide seed treatments can reduce the risk of infection. Spray applications of fungicides after growth stage R1 can reduce disease severity. But applications made at stage R3 are considered most effective.
My advice would be to contact Soybean Product Manager Steve Sick first before treating.

Late Season Nitrogen Application

NOTE: Practices such as fall-applied or early-spring applied N or surface-applied urea provide a larger “window of opportunity” for N loss and therefore would require higher N rates to achieve optimum yield.
Providing sufficient but not excessive nitrogen (N) to corn is difficult especially with fall and early spring fertilizer applications where N loss can vary substantially with the timing of the application relative to the occurrence of warm soil and excessive rainfall. Nitrogen deficiency occurs most growing seasons and often leads to an interest in applying N fertilizer beyond the growth stage and height where standard N application equipment can be used.
Nitrogen applied up to 2-3 weeks after silking to N deficient but otherwise healthy corn can result in increased grain yield. The greater the N deficiency and the earlier the N application the larger the yield increase.

Nitrogen Deficiancy in Pre-Tassel Corn

 

 

 

 

 

 

 

 

 

 

 

 

Gray Leaf Spot 

 

Northern Corn Leaf Blight

Agronomy, Corn, Disease, Indiana, Michigan, Ohio, Soybeans