- Worldwide distribution. On capsicum, cotton, cowpea, eggplant, okra, soybean, tomato, and more. A minor disease when plants are wounded by weather or insects.
- Spots, irregular, 1-2 mm, pale brown with brown borders, on leaves and stems. Large spots on fruits with black tiny fruiting bodies.
- Spread in rain splash and wind; possibly, seed.
- Cultural control: care during cultural operations; weed; control fruit flies; handle fruit with care; collect and burn trash after harvest; crop rotation.
- Chemical control: not recommended for this disease; if required use copper or chlorothalonil.
Pacific Pests, Pathogens, Weeds & Pesticides
Capsicum Phoma blight (239)
Photo 1. Small, irregular spots 1-2 mm, on a capsicum leaf, brown at first, later maturing to light grey with brown border.
Photo 2. Close-up of a single spot showing the pycnidia (black dots) which contain large numbers of spores.
Phoma species; commonly Phoma exigua. It was previously known as Ascochyta phaseolorum. It has been renamed Boeremia exigua var. exigua.
AUTHOR Grahame Jackson
Information from McKenzie E (2013) Boeremia exigua: PaDIL - https://www.padil.gov.au/; and from CABI (2019) Boeremia exigua var. exigua (leaf spot). Crop Protection Compendium. (https://www.cabi.org/cpc/datasheet/40426). Photos 1&2 Jacqui (Wright) Kami, formerly Plant Pathologist, Secretariat of the Pacific Community, Suva, Fiji. Photo 3 Phoma pycnidia Bruce Watt, University of Maine, Bugwood.org. Photo 4 Phoma sp. Division of Plant Industry Archive, Florida Department of Agriculture and Consumer Services, Bugwood.org.
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.