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First report on Corynespora cassiicola and its pathogenicity to soybean cultivars in Zambia
Author(s) -
KAPOORIA R. G.,
NDUNGURU J.,
RONG I.
Publication year - 1998
Publication title -
eppo bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.327
H-Index - 36
eISSN - 1365-2338
pISSN - 0250-8052
DOI - 10.1111/j.1365-2338.1998.tb00722.x
Subject(s) - corynespora cassiicola , cultivar , biology , inoculation , pathogenicity , horticulture , potato dextrose agar , agar , veterinary medicine , agronomy , botany , leaf spot , bacteria , microbiology and biotechnology , medicine , genetics
Off‐season volunteer soybean plants growing among the irrigated wheat during 1997–06/08 showed unfamiliar leaf symptoms in a farm east of Lusaka. The causal organism was isolated on potato dextrose agar and was identified as Corynespora cassiicola. Its identity was established on the basis of typical disease symptoms, characteristic colony features and distinct conidial morphology. Koch's postulates confirmed its pathogenicity to soybean and symptoms were noticed in 7–10 days following inoculation. The interaction between C. cassiicola and soybean cvs Hernon‐147, Kaleya, Santa Rosa and SCS1 was also investigated and showed that the lesions among the four commonly grown cultivars in Zambia ranged between small (1–2 mm) and large (4–6 mm) in size and the cultivars developed either few or many lesions. This demonstrated that Santa Rosa and SCS1 were moderately resistant/tolerant while Hernon‐147 and Kaleya were susceptible. This is the first report on the occurrence of C. cassiicola on soybean in Zambia.