Premium
Field experiments with chat‐fruit virus disease of apple
Author(s) -
POSNETTE A. F.,
CROPLEY R.
Publication year - 1965
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.1744-7348.1965.tb07957.x
Subject(s) - biology , rootstock , virus , virus diseases , horticulture , fruit tree , botany , rosaceae , virology
SUMMARY Using the indicator variety, Lord Lambourne, apple chat‐fruit virus was detected in some plants of the apple rootstock clones M. IV and M. VII but not in clones M. I, M. II, M. III, M. IX, M. XII, M. XVI and Crab C. The virus occurred in three nurserymen's Lord Lambourne scion material but not in that of a fourth. Fruit weights were more reliable than visual observations for diagnosis of chat‐fruit disease, especially in young trees. Natural spread of the disease in these field trials was very slow and insufficient to interfere with interpretation of results. Infection was not fully systemic in apple trees, so that both healthy and infected trees were propagated from affected trees, some buds from which, when used as graft‐inoculum, transmitted the virus to test trees while others did not. Two previously unrecorded effects of chat‐fruit disease were observed: circular spots on the fruit and delayed fruit drop.