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2022 Midwest Vegetable Guide

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Asparagus – Insects 84 Midwest Veg Guide 2022 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: 12- hour. 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 labeled at various rates. See label for directions. REI: 12- hour. 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: 24- hour. 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: 24- hour. 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 2.5- 5.3 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: 1- day. 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.

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