Midwest Vegetable Guide - 2022 - 272

Sweet Corn - Diseases
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.
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.
mancozeb products (mancozeb) | Several formulations of
mancozeb (Dithane, Manzate, Penncozeb) are labeled at
various rates. See label for directions. REI: 24-hour. PHI: 7day.
FRAC M03.
Priaxor (fluxapyroxad, pyraclostrobin) | 4-8 fl. oz. per
acre. REI: 12-hour. PHI: 7-day. FRAC 07, FRAC 11.
propiconazole products (propiconazole) | 2-4 fl. oz. per
acre. PropiMax EC and Tilt are labeled. REI: 12-hour. PHI:
14-day. FRAC 03.
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.
tebuconazole products (tebuconazole) | 4-6 fl. oz. per acre.
There are many brand names (Monsoon, Onset, Vibe) with
3.6 lbs. a.i. per gallon that use the same rate. In sweet corn,
REI is longer than the PHI, and pickers may require PPE if
timing is not planned. REI: 12-hour to 18-day. PHI: 7-day.
FRAC 03.
Smut of Corn - Ustilago Fungus
This pathogen is common at low levels, but it can be worse
when roots and stalks are damaged from close cultivation that
nips the roots, wind lodging and wind sandblasting, or in
times of drought stress. When under drought stress, tasseling
and silking do not line up. Tassels come first and silks last
272
mancozeb products (mancozeb) | Several formulations of
mancozeb (Dithane, Manzate, Penncozeb) are labeled at
various rates. See label for directions. REI: 24-hour. PHI: 7day.
FRAC M03.
Midwest Veg Guide 2022
longer than usual because they are not getting pollinated. This
provides an entry for the fungus into the ears. Flowering
patterns and response to environmental stress are unique to
each variety. Planting field position in relation to prevailing
winds, timing and variety are likely factors for disease
occurrence.
Non-Pesticide
Some hybrids tend to have fewer infections. Use past
experience to choose successful hybrids. Avoid mechanical
damage to corn plant. Avoid plant stresses that affect pollen
production and silk emergence.
Southern Corn Leaf Blight of Corn -
Bipolaris 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.
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.
Midwest Vegetable Guide - 2022

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