NOTE: For the disease control products listed below, one product trade name and formulation is provided for each active ingredient (common name) as an example of rates, days to harvest (dh), REI, and special instructions. In many cases, there are other products available with the same active ingredient. Please see Table 28 and Fungicides and Bactericides Alphabetical Listing by Trade Name for more information on products with the same active ingredients.
The symbol OG indicates a product is listed by the Organic Materials Review Institute (OMRI) as approved for use in organic production. See Organic Certification section for more details.
Crown Rot (Fusarium species)
Vigorously growing plants are less susceptible to crown rot. Buy top quality crowns. Use new land or land where asparagus has not been grown for 10 years. Use tolerant varieties.
Rust (Puccinia asparagi)
Rust disease attacks fern foliage and can spread rapidly affecting production in subsequent years. Fern residues should be removed and destroyed prior to spear emergence in the spring. Control volunteer asparagus plants that might be infected. Resistant cultivars are not available. Apply fungicides after spear harvest is complete.
Bacillus amyloliquefaciens strain D747 (DoubleNickelOG): 0.25 to 3.0 lb/A. (0 dh, REI 4 h, Group 44). Disease suppression only. For improved control; mix or rotate with a chemical fungicide.
chlorothalonil (Bravo Weather Stik): 2 to 4 pt/A. (190 dh, REI 12h, Group M5). Do not apply within 190 days of the harvest of spears in the following season.
mancozeb (Dithane F45): 1.6 qt/A. (180 dh, REI 24h, Group M3). Begin applications after spears have been harvested.
myclobutanil (Rally): 5.0 oz/A (180 dh, REI 24h, Group 3). Begin applications after spears have been harvested. Observe a 30-day plant-back interval between the last application and planting new crops at the treatment site.
sulfur (Microthiol D): 10-20 lb/A. (0 dh, REI 24h, Group M2). Apply to ferns after cutting.