The pathogen Colletotrichum lagenarium, along with other similar fungi, causes anthracnose in mirlitons (chayote) in the United States. Most growers have found that existing fungicides are ineffective as a preventative. While there is significant research on post-harvest anthracnose, I have not found any on pre-harvest anthracnose. If there is no scientific research, do you know of any chayote growers who have had anecdotal success with a particular fungicide?
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Liu, C., Liu, H., Wang, C., Kong, F., He, H. and Qiao, Y., 2024. Antifungal activity and mechanisms of ε-poly-l-lysine (ε-PL) against Colletotrichum lagenarium in marrow squash. LWT, 199, p.116057.
Citation: "ε-Poly-l-lysine (ε-PL) was initially isolated from Streptomyces albulus sp. lysinopolymerus strain 346, and later was found in other bacterial or eukaryotic cells (Shih et al., 2006). ... The US Food and Drug Administration has also authorized it as generally recognized as safe (GRAS) for using ε-PL at levels of up to 50 mg kg−1 in food (GRAS No. 000135, Ye et al., 2013, Ye et al., 2013). ... Studies have shown that ε-PL is a cationic surface active agent, and high water solubility and stability, due to its positively charged amino group in water, and hence they were shown to have a wide antimicrobial activity against yeast, fungi, Gram positive and Gram negative bacterial species (Hiraki, 2000; Shima et al., 1984)."
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