Midwest Vegetable Guide - 2022 - 84

Asparagus - Insects
control of purple spot. NOTE: Products labeled for rust may
be helpful for purple spot control.
Non-Pesticide
Reduce crop residues by removing or mowing senescent and
dried fern in the fall/winter.
Pesticide
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: 100-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: 190-day. FRAC M05.
Dexter Max (DG) (mancozeb, azoxystrobin) | 2-2.2 lbs. per
acre. REI: 24-hour. PHI: 180-day. FRAC M03, FRAC 11.
Flint (50) (trifloxystrobin) | 3-4 oz. per acre. Make uniform
applications in a minimum 30 gals. Per acre. Mow down
the asparagus ferns (or allow the ferns to senesce) between
the last fungicide application and harvest. REI: 12-hour. PHI:
180-day. FRAC 11.
Flint Extra (4.05) (trifloxystrobin) | 3-3.8 fl. oz. per acre.
Apply on a 14-day interval as needed. Make applications to
the fern stage only. Mow down the asparagus ferns (or allow
the ferns to senesce) between the last fungicide application
and harvest. REI: 12-hour. PHI: 180-day. FRAC 11.
Rust of Multiple Crops - Puccinia
Fungus
Non-Pesticide
Reduce crop residues that may harbor the pathogen by
removing or mowing senescent and dried ferns in the
fall/winter. Scout for the early appearing bright orange aecial
pustules in the spring, especially on new or young plantings
that are not harvested the full season. Remove volunteer
plants on field edges and ditchbanks. Plant crop rows with
ample spacing and in the direction of the prevailing winds to
increase air movement and minimize periods of prolonged
leaf wetness. Reduce crop residues by removing or mowing
senescent and dried fern in the fall/winter.
Pesticide
chlorothalonil products (chlorothalonil) | Several
formulations of chlorothalonil (Bravo, Echo, Equus) are
84
Midwest Veg Guide 2022
labeled at various rates. See label for directions. REI: 12hour.
PHI: 190-day. FRAC M05.
Dexter Max (DG) (mancozeb, azoxystrobin) | 2-2.2 lbs. per
acre. REI: 24-hour. PHI: 180-day. FRAC M03, FRAC 11.
mancozeb products (mancozeb) | Several formulations of
mancozeb products (Dithane, Manzate, Penncozeb) are
labeled at various rates. See label for directions. REI: 24hour.
PHI: 180-day. FRAC M03.
Rally 40WSP (myclobutanil) | 5 oz. per acre. REI: 24-hour.
PHI: 180-day. FRAC 03.
Sonoma 40WSP (myclobutanil) | 5 oz. per acre. REI: 24hour.
PHI: 180-day. FRAC 03.
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. REI: 12-hour to
18-day. PHI: 180-day. FRAC 03.
Unicorn DF (WDG) (tebuconazole, sulfur) | 2-3.75 lbs. per
acre. REI: 12 to 24-hour. PHI: 180-day. FRAC 03, FRAC
M02, IRAC UN.
Asparagus - Insects
Reviewed by Laura Ingwell, Zsofia Szendrei - Sept 2021
Recommended Controls
Aphids
Treat when less than 5% of ferns have aphids present.
Pesticide
Assail 30SG (acetamiprid) | Use 30SG formulations at 2.55.3
oz. per acre and do not exceed 10.7 oz. per acre per
season. Use 70WP formulations at 1.1-2.3 oz. per acre and do
not exceed 4.6 oz. per acre per season. For control on spears
during harvest, to prevent egg laying and feeding injury.
Allow 10 days between applications. REI: 12-hour. PHI: 1day.
IRAC 04A.
Fulfill (50WDG) (pymetrozine) | 2.75 oz. per acre. Apply to
fern only after harvest has been completed. Allow a minimum
of 30 days between applications. Do not exceed 16.5 oz. per
acre per season. REI: 12-hour. PHI: 170-day. IRAC 09B.
Midwest Vegetable Guide - 2022

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