New Strain of Okra Mosaic Virus in Nigeria. E. C. K. Igwegbe, Department of Crop Science, University of Nigeria, Nsukka, Anambra State, Nigeria. Plant Dis. 67:320-322. Accepted for publication 23 May 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-320.

The agent causing yellow vein and mosaic diseases of Sida linifolia, Abelmoschus esculentus, and Hibiscus rosa-sinensis was identified as a new strain of okra mosaic virus (NIN-OKMV). All three isolates of NIN-OKMV had a dilution end point between 10^–3 and 10^–4, thermal inactivation point between 55 and 60 C, and longevity in vitro between 8 and 10 days. The isolates differed from previously described OKMV strains in that they incited local and systemic chlorotic lesions in Chenopodium quinoa and C. amaranticolor and were infectious to Solanum melongena, Sesamum indicum, and Crotalaria spp. In double-diffusion tests, all three isolates reacted without spur formation to an antiserum to a Nigerian strain of OKMV.