Midwest Vegetable Guide - 2022 - 273

Sweet Corn - Insects
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) | 7-14 fl. oz. per
acre. Use lower rate for early season applications and
increase rate with disease pressure. REI: 12-hour. PHI: 14day.
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.
Stewart's Wilt of Corn - Pantoea
Bacteria
This bacterial disease is spread by overwintered flea beetles
in the spring time. If the plants become infected at the
seedling stage, they become severely stunted and have white
striping on the leaves and internal browning of stem tissue.
Infections after the seedling stage will cause leaf blight and
are generally not as economically severe as seedling
infections. Early infection of seedling plants can lead to total
yield loss in some plantings. Severity of the disease is
directly related to overwintering survival of the flea beetle,
and beetle survival depends directly on temperature. See
insect section.
Non-Pesticide
Plant wilt-resistant, or partially resistant hybrids. Monitor
overwintering flea beetle population.
Pesticide
Insecticides | Use an insecticide or seed treatment to control
the flea beetles that transmit Stewart's wilt. Insecticide
treatments are more likely to be necessary in season
following a mild winter and when using susceptible varieties.
Viruses of Multiple Crops - Multiple
Pathogens
Non-Pesticide
Virus diseases include maize dwarf mosaic, chlorotic dwarf,
wheat streak mosaic. Plant resistant or partially resistant
varieties. Control Johnson grass and volunteer wheat.
Sweet Corn - Insects
Reviewed by Laura Ingwell - Sept 2021
Recommended Controls
Aphids
Non-Pesticide
Heavy corn leaf aphid infestations are often limited to earlyseason
plantings that develop on late whorl to early tassel
sweet corn. During this time, several beneficial organisms
(including lady beetles, minute pirate bugs, and parasitoids)
will keep those infestations in check.
Pesticide
Asana XL (0.66EC) (esfenvalerate) | 2.9-9.6 fl. oz. per acre.
Caterpillars include cutworms, corn borers, and earworms.
Do not exceed 9.6 fl. oz. per acre per season. REI: 12-hour.
PHI: 1-day. IRAC 03A. RUP.
Assail 30SG (acetamiprid) | Use 30SG formulations at 2.12.9
oz. per acre and do not exceed 11.2 oz. per acre per
season. Use 70WP formulations at 0.9-1.2 oz. per acre and do
not exceed 4.8 oz. per acre per season. Allow 7 days between
applications. REI: 12-hour. PHI: 1-day. IRAC 04A.
Capture LFR (1.5) (bifenthrin) | 2.8-8.5 fl. oz. per acre.
Apply as a foliar spray. REI: 12-hour. PHI: 1-day. IRAC
03A. RUP.
Lannate LV (2.4L) (methomyl) | 0.75 - 1.5 pts. per acre. Do
not exceed 21 pts. per acre per crop. Some varieties are
susceptible to methomyl injury; determine crop safety before
full scale spraying. REI: 48-hour. PHI: 0-day for ears, 3-day
for forage. IRAC 01A. RUP.
Mustang Maxx (0.8) (zeta-cypermethrin) | 2.8-4.0 fl. oz.
per acre. For armyworms, corn borers, cutworms, and
earworms. Do not exceed 24 fl. oz. per acre per season. REI:
12-hour. PHI: 3-day. IRAC 03A. RUP.
Midwest Veg Guide 2022
273
Midwest Vegetable Guide - 2022

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