Articles
BACTERIAL CANKER, AN IMPORTANT DECLINE DISEASE OD APRICOTS AND OTHER STONE FRUITS IN CALIFORNIA
Article number
85_47
Pages
235 – 242
Language
English
Abstract
Bacterial canker, caused by Pseudomonas syringae, continues
to cause, serious damage to apricot and other stone
fruit trees in California.
It is especially destructive
to young trees, where braches and sometimes entire trees
are killed.
Most infection leading to canker formation
appears to occur through leaf scars and is caused by bacteria that survive much of the year as epiphytes.
Pruning wounds do not appear to be an important infection court, and time of pruning has not been correlated with canker
severity.
Canker activity is correlated with tree dormancy,
and extension of the dormant period as a result of
inadequate winter chilling increases disease severity.
Canker generally is more serious in trees growing on light
sandy soil than in those on heavier soil.
Shallow soil,
inadequate nutrition, and the nematode Macroposthonia
xenoplax also are predisposing disease factors.
Canker
severity is much less in French prune and several plum
cultivars propagated on Lovell peach than on plum rootstocks
and there is some evidence that canker in apricot
on peach rootstock is less destructive.
Autumn, postpruning,
and early spring sprays of streptomycin or copper
compounds have generally provided unsatisfactory control
of canker.
Preplant soil fumigation with several nematicidal
fumigants and postplant fumigation with dibromochloropropane
have enhanced tree growth and provided effective
control of bacterial canker in several stone fruit
areas.
to cause, serious damage to apricot and other stone
fruit trees in California.
It is especially destructive
to young trees, where braches and sometimes entire trees
are killed.
Most infection leading to canker formation
appears to occur through leaf scars and is caused by bacteria that survive much of the year as epiphytes.
Pruning wounds do not appear to be an important infection court, and time of pruning has not been correlated with canker
severity.
Canker activity is correlated with tree dormancy,
and extension of the dormant period as a result of
inadequate winter chilling increases disease severity.
Canker generally is more serious in trees growing on light
sandy soil than in those on heavier soil.
Shallow soil,
inadequate nutrition, and the nematode Macroposthonia
xenoplax also are predisposing disease factors.
Canker
severity is much less in French prune and several plum
cultivars propagated on Lovell peach than on plum rootstocks
and there is some evidence that canker in apricot
on peach rootstock is less destructive.
Autumn, postpruning,
and early spring sprays of streptomycin or copper
compounds have generally provided unsatisfactory control
of canker.
Preplant soil fumigation with several nematicidal
fumigants and postplant fumigation with dibromochloropropane
have enhanced tree growth and provided effective
control of bacterial canker in several stone fruit
areas.
Authors
H. English, J.R. Davis, J.E. DeVay, B.F. Lownsbery
Keywords
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