In the absence of treated seed, there are multiple chemical sprays available to treat "Alternaria dauci." Azoxystrobin, chlorothalonil, iprodione, pyraclostrobin and bacillus are a few common fungicides to consider for foliar application. A few brand names to look for in the Midwest include RR Endura 70WG, Rovral, and Switch. Gibberrillic acid has shown to be equally effective as the aforementioned fungicides. However, if sprayed in excess giberrillic acid can defer nutrients from the roots to foliage, resulting in undeveloped carrots. If chemically treating plants, scouting the crop is of utmost importance. Initial threshold recommendations vary depending on location, time of year, and moisture level. Different recommendations include spraying upon first evidence of symptoms or spraying once disease has reached 25% of the foliage