Midwest Vegetable Guide - 2022 - 270

Sweet Corn - Diseases
from fertilizer (including starter) and other credits should be
100 to 120 pounds per acre.
Harvesting
Sweet corn is harvested when the kernels plump up and
flavor is good. Normally 18 to 21 days after 50% of the
plants have silked sweet corn will be ready to harvest. Sugary
and sugar-enhanced varieties should be harvested promptly
when they are ready to reduce starchy buildup in the kernels.
Synergistic, supersweet and augmented supersweet varieties
can be harvested over a slightly longer period. Hand picking
is common, but there are single-row and multi-row
mechanical harvester options.
Sweet Corn - Diseases
Reviewed by Dan Egel - Sept 2021
Recommended Controls
Anthracnose of Corn - Colletotrichum
Fungus
Non-Pesticide
Rotate to non-host crops for 1-3 years. Varieties with
resistance are available. Prompt destruction of the finished
crop with tillage to rapidly breakdown tissue is an important
method to prevent disease build-up.
Pesticide
Aproach (2.08SC) (picoxystrobin) | 3-12 fl. oz. per acre.
Use 3-6 fl. oz rate for single application for early disease
control between V4 and V7. Use the 6-12 fl. oz. rate for
repeated applications for continued season long control
between VT and R3. REI: 12-hour. PHI: 7-day. FRAC 11.
azoxystrobin products (azoxystrobin) | Use 2 lb. a.i. per
gallon formulations (Quadris) at 6.0-15.5 fl. oz. per acre. Use
3.3 lb. per gallon formulations (Azteroid) at 3.9-9.7 fl. oz. per
acre. REI: 4-hour. PHI: 7-day. FRAC 11.
Elatus (WG) (azoxystrobin, benzovindiflupyr) | 5-7.3 oz.
per acre. REI: 12-hour. PHI: 7-day. FRAC 11, FRAC 07.
Headline (SC) (2.08) (pyraclostrobin) | 6-12 fl. oz. per acre.
REI: 12-hour. PHI: 7-day. FRAC 11.
Headline AMP (pyraclostrobin, metconazole) | 10-14.4 fl.
oz. per acre. REI: 12-hour. PHI: 20-day. FRAC 11, FRAC 03.
270
Priaxor (fluxapyroxad, pyraclostrobin) | 4-8 fl. oz. per
acre. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 11.
Quilt (SE) (azoxystrobin, propiconazole) | 10.5-14.0 fl. oz.
per acre. REI: 12-hour. PHI: 14-day. FRAC 11, FRAC 03.
Stratego (propiconazole, trifloxystrobin) | 10 fl. oz. per
acre. REI: 12-hour. PHI: 14-day. FRAC 03, FRAC 11.
Goss' Wilt of Corn - Clavibacter Bacteria
This pathogen primarily infects leaves that have been
wounded by wind, sandblasting, hail, and insect feeding. It
overwinters on plant residue on the soil surface.
Non-Pesticide
Rotate to non-host crops for at least 1 year. Use disease-free
seed and resistant varieties. Control grassy weeds that are
also hosts to the pathogen. Prompt destruction of the finished
crop with tillage to rapidly breakdown tissue is an important
method to prevent disease build-up.
Northern Corn Leaf Blight of Corn -
Exserohilum or Helminthosporium
Fungus
Non-Pesticide
Rotate to non-host crops for at least 1 year. Varieties with
resistance are available. Prompt destruction of the finished
crop with tillage to rapidly breakdown tissue is an important
method to prevent disease build-up.
Pesticide
Aproach (2.08SC) (picoxystrobin) | 3-12 fl. oz. per acre.
Use 3-6 fl. oz rate for single application for early disease
control between V4 and V7. Use the 6-12 fl. oz. rate for
repeated applications for continued season long control
between VT and R3. REI: 12-hour. PHI: 7-day. FRAC 11.
azoxystrobin products (azoxystrobin) | Use 2 lb. a.i. per
gallon formulations (Quadris) at 6.0-15.5 fl. oz. per acre. Use
3.3 lb. per gallon formulations (Azteroid) at 3.9-9.7 fl. oz. per
acre. REI: 4-hour. PHI: 7-day. FRAC 11.
chlorothalonil products (chlorothalonil) | Several
formulations of chlorothalonil (Bravo, Echo, Equus) are
labeled at various rates. See label for directions. REI: 12hour.
PHI: 14-day. FRAC M05.
Elatus (WG) (azoxystrobin, benzovindiflupyr) | 5-7.3 oz.
per acre. REI: 12-hour. PHI: 7-day. FRAC 11, FRAC 07.
Midwest Veg Guide 2022
Midwest Vegetable Guide - 2022

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