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Some isolates of virus causing swollen‐shoot disease of cacao in Nigeria and their interrelationships
Author(s) -
THRESH J. M.
Publication year - 1961
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1961.tb03619.x
Subject(s) - biology , chlorosis , shoot , inoculation , seedling , virulence , virus , botany , horticulture , veterinary medicine , virology , biochemistry , gene , medicine
SUMMARY Many symptomatically distinct virus isolates were made from cacao trees infected with swollen‐shoot disease in Nigeria. The symptoms caused by typical viruses from six different localities were studied on seedling Amelonado cacao inoculated as beans. Two isolates caused swellings as the only permanent symptom and another caused only leaf chlorosis. The others caused both swellings and chloroses of different type and severity. Two atypical isolates were much less virulent than the others and caused only transient and very inconspicuous leaf symptoms. Isolates from the same or from adjacent trees usually protected against each other, whereas those from dissimilar areas did not. This suggests that the isolates are not all closely related and they may be grouped according to the results of plant protection tests.