Troubleshooting
Hosui Asian pear problems — and how to fix them
Hosui Asian pear (Pyrus pyrifolia 'Hosui') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Fire blight (Erwinia amylovora)
'Hosui' has moderate susceptibility to fire blight. Prune out blighted wood well below infection margins, sterilise tools with 70% ethanol or 10% bleach solution between cuts, and avoid high-nitrogen fertilising. Copper sprays at early bloom help reduce bacterial load.
Codling moth (Cydia pomonella)
Larvae tunnel into developing fruit, causing premature drop and internal damage. Use pheromone traps to monitor adult flights and apply kaolin clay or approved insecticide at egg hatch. Thin fruit clusters to reduce larval shelters.
Brown spot (Stemphylium vesicarium)
Fungal disease causing dark brown lesions on leaves and fruit, particularly in humid conditions. Rake and destroy fallen leaves. Preventative copper or sulphur sprays from petal fall through summer reduce incidence.
Prevent hosui asian pear problems before they start
Most hosui asian pear issues are care-mismatch, not bad luck. Dial in the basics:
Hosui Asian pear problems — FAQ
Why is my hosui asian pear fire blight (erwinia amylovora)?
'Hosui' has moderate susceptibility to fire blight. Prune out blighted wood well below infection margins, sterilise tools with 70% ethanol or 10% bleach solution between cuts, and avoid high-nitrogen fertilising. Copper sprays at early bloom help reduce bacterial load.
Why is my hosui asian pear codling moth (cydia pomonella)?
Larvae tunnel into developing fruit, causing premature drop and internal damage. Use pheromone traps to monitor adult flights and apply kaolin clay or approved insecticide at egg hatch. Thin fruit clusters to reduce larval shelters.
Why is my hosui asian pear brown spot (stemphylium vesicarium)?
Fungal disease causing dark brown lesions on leaves and fruit, particularly in humid conditions. Rake and destroy fallen leaves. Preventative copper or sulphur sprays from petal fall through summer reduce incidence.