- Worldwide distribution. On papaya. Usually, a minor disease.
- Spots, round to irregular, 3-6 mm on older leaves, pale brown above with yellow margin; dark below as spores form. Dark spots on fruit, slightly sunken.
- Heavy spotting causes leaves and young fruit to fall, reducing yields and sales of fruits.
- Cultural control: remove infected leaves, and burn.
- Chemical control: use (i) copper, chlorothalonil or mancozeb (protectants), or (ii) tubuconazole (systemic), ensuring coverage of underside of the leaves. Alternate the two types of fungicides.
Pacific Pests, Pathogens, Weeds & Pesticides
Papaya black spot (158)
Photo 1. Black spot of papaya, Asperisporium caricae, on the underside of the leaf. Large numbers of spots cause the leaves to dry, die and fall.
Asperisporium caricae; previously Cercospora caricae.
AUTHOR Grahame Jackson
Information from Diseases of fruit crops in Australia (2009). Editors, Tony Cooke, et al. CSIRO Publishing; and CABI (2019) Asperisporium caricae (black spot). Crop Protection Compendium. (https://www.cabi.org/cpc/datasheet/7521); and from Liberato JR, et al. (2006) Asperisporium black spot of papaya (Asperisporium caricae): PaDIL - http://www.padil.gov.au.
Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community.