Honeycrisp is susceptible to fireblight during establishment years (Rosenberger, 2003). It is also susceptible to sunburn and heat injury (Rosenberger, 2008). Growers may consider using overhead cooling to protect crops during August heat waves. Honeycrisp is also susceptible to black and white rots (Rosenberger, 2003). Apply fungicides (Topsin, captan, strobilurins) after petal fall and in late summer. Scab is rarely seen on Honeycrisp fruit.
In storage, Honeycrisp is susceptible to Penicillium blue mold (Rosenberer, 2003). Sanitize bins, packing areas, and storage rooms, and keep Honeycrisp fruit away from areas and bins contaminated with blue mold.
- Rosenberger, D. 2003. Susceptibility of new apple cultivars to common apple diseases. N.Y. Fruit Quarterly 11(2):17-22. HC Disease suscep-NYFQ-03.pdf
- Rosenberger, D. 2003. Managing diseases and arthropod pests on Honeycrisp. N.Y. Fruit Quarterly 11(3):13-15. http://www.nyshs.org/fq/03fall/NYFQFall2003.pdf
- Rosenberger, D. 2004. Fruit decay problems in Honeycrisp. Proc. New Engl. Fruit and Veg. Conf. Manchester, NH. Dec. 15-16. HC summer decays extn article.pdf