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2022 Midwest Vegetable Guide

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Asparagus – Diseases Midwest Veg Guide 2022 83 Fertilizing pH: Maintain a soil pH of 6.7 to 7.0. If possible, apply lime the year before planting. New plantings: Before planting new crowns, apply 50 pounds N per acre, 0 to 160 pounds P 2 O 5 per acre, and 0 to 150 pounds K 2 O per acre based on soil test results and recommendations from your state. Broadcast the fertilizer and plow it under when preparing the land for the planting furrows. In addition, apply 30 pounds P 2 O 5 per acre in the bottom of the trench and cover with 1 inch of soil before setting crowns. For transplanted seedlings, apply 4 ounces of transplant solution (e.g. 2-3 lbs. of 10-52-17 or 9-45-15 in 50 gallons of water) to each transplant. Established plantings: Each year before emergence, apply 20 to 40 pounds N per acre by broadcasting and incorporate by lightly tilling. After harvests conclude, apply 40 to 60 pounds N per acre. The total amount of N from fertilizer should be 80 pounds N per acre. No P 2 O 5 is necessary if adequate fertilization was achieved prior to planting. Every second year apply up to 60 pounds K 2 O per acre if a soil test recommends it. Harvesting Harvest only 2 or 3 times in spring 1 year after transplanting. Thereafter, harvest for about 2 months in the spring. Harvest asparagus early in the morning for best quality. Allow the ferns to grow vigorously after this period to accumulate food reserves for the next season. As much care should be put into maintaining a healthy fern as into harvest. Asparagus – Diseases Reviewed by Dan Egel, Mary Hausbeck – Sept 2021 Recommended Controls Crown and Root Rot of Asparagus - Fusarium Fungus The Fusarium pathogen can be seed borne. Try to source material for new plantings from fields fumigated with chloropicrin. Non-Pesticide The disease is promoted by acidic (low pH) and poorly drained soil. Establish production fields with blemish-free crowns produced in virgin soil. Avoid fields with a history of crown and root rot. Use tolerant, vigorous varieties if available, and avoid long harvest periods to maintain vigor in the plant over years. Pesticide Cannonball (50WP) (fludioxonil) | 0.5 oz. per 100 gals. of water. Michigan only (MI 24c exp. 12/31/22). Submerge and soak crowns for 10 minutes and allow to drain before planting. REI: 12-hour. PHI: 365-day. FRAC 12. Crown and Spear Rot of Asparagus - Phytophthora Oomycete Non-Pesticide Avoid excessive irrigation. Choose well-drained planting sites. Establish production fields from blemish-free crowns obtained from virgin soil. Avoid long harvest periods to maintain vigor in the plant over years. Pesticide metalaxyl 2E (metalaxyl) Celery | 2 pts. per acre. Use as broadcast spray in a minimum of 10 gals. of water over the beds. Cutting beds: Apply 30-60 days before the first cutting. For additional control, make another application just before the beginning of harvest. New Plantings: Apply after planting seedlings or after covering one-year-old crowns. formulations are labeled. REI: 48-hour. PHI: 1-day. FRAC 04. Orondis Gold 200 SC (oxathiapiprolin) | 4.8-9.6 fl. oz. per acre. Use 10 Gals of water, or the volume required to fully submerge 100 crowns. Use as a crown soak prior to planting. REI: 4-hour. PHI: 0-day. FRAC 49. phosphite and phosphorous acid products (phosphorous acid, potassium phosphite, mono-dipotassium salts of phosphorous acid, mono- and dibasic sodium, potassium, and ammonium phosphites, fosetyl-aluminum) | Rates vary depending on formulation and product. Apply the product to fully expanded ferns. Do not apply to ferns that are beginning to senesce. Thorough coverage is required. REI: 4 to 12-hour. PHI: See label. FRAC 33. Ridomil Gold SL (4SC) (mefenoxam) | 1 pt. per acre. Apply 30 to 60 days before the first cutting. Apply again just before the beginning of harvest. Other formulations include MetaStar, Subdue Maxx, Ultra Flourish, and Xyler. Rates vary by formulation. REI: 48-hour. PHI: 1-day. FRAC 04. Purple Spot of Asparagus - Stemphylium Fungus Weather forecasting tools, such as TOM-CAST, can help asparagus farmers schedule their fungicide applications for

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