Boeremia exigua var. exigua
leaf spot
Ascochyta asteris, Ascochyta cyphomandrae, Ascochyta hydrangeae, Ascochyta nicotianae, Ascochyta phaseolorum, Ascochyta sonchi, Phoma exigua f.sp. exigua, Phoma exigua var. exigua, Phoma herbarum, Phoma herbarum f. brassicae, Phoma herbarum f. hyoscyami, Phoma herbarum f. schoberiae, Phoma herbarum var. dulcamaricola, Phoma linicola, Phoma solanicola, Phoma solanophila, Phoma tuberosa, Phyllosticta decidua, Phyllosticta hortorum, Phyllosticta mulgedii, Phyllosticta sambuci, Phyllosticta vincae-majoris, Phyllosticta vincae-minoris
Worldwide. CABI: B. exigua var. exigua is almost certainly ubiquitous worldwide, but many records fail to specify the variety that it is not possible to provide particular country/state information. There are undoubtedly many records under the many synonyms and these require re-examination.
Widespread
2024-09-04
fungus
Korea
B. exigua var. exigua is a ubiquitous weak or secondary pathogen on more than 200 different plant genera. Main hosts are in the Fabaaceae and Solanaceae familes.
PHOMHE
This pathogen has been reported in Korea under other synonyms. This is a weak pathogen capable of persisting in soil and also transmitted by rainsplash-dispersed conidia. Common bean and possible sugarcane are the only hosts shown where seed may be a pathway.
12 Known Hosts
Phaseolus vulgaris
common bean
Yes
PHOMHE-4, ISFRPLD, RICHISTA, PHOMHE-6, PHOMHE-7
Reports show seed is a pathway, however; it is not clear how much seed contributes to the epidemiology of the disease.
Yes
Blotter and agar incubation
Tests have not been standardized or validated
PHOMHE-4, ISFRPLD
Cultural, Chemical
Suggested management strategies suggest using resistant varieties, crop rotation, field inspections, wide plant spacing, clean seed planting, seed treatment, and foliar fungicide application.
ISFRPLD, PHOMHE-7
Yesuf M and Sangchote S. 2005. Occurrence and distribution of major seedborne fungi associated with Phaseolus bean seeds in Ethiopia. Kasetsart Journal, Natural Sciences, 39:216-225.
Boerema, G.H., Crueger, G., Gerlagh, M. and Nirenberg, H. (1981). Phoma exigua var. diversispora and related fungi on Phaseolus beans. Journal of Plant Diseases and Protection 88(10):597-607.
Koder, S. B., Nawale, R., Katyayani, K. K. S., Rana, M., & Srivastava, S. (2022). Symptoms, biology and management of ascochyta blight (Phoma exigua) of French beans: A review. Agricultural Science Digest-A Research Journal, 42(6), 657-664.
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