Editing Prunus (section)

== Pests and diseases ==
[[File:Gummosis on an ornamental cherry.JPG|thumb|Cherries are prone to [[gummosis]].]]

Various ''Prunus'' species are winter hosts of the Damson-hop aphid, ''[[Phorodon humuli]]'', which is destructive to hops ''[[Humulus lupulus]]'' just at the time of their maturity,<ref>{{cite web |title=Damson-hop aphid, ''Phorodon humuli'' |url=http://www.rothamsted.ac.uk/insect-survey/STPhorodon_humuli.php |url-status=dead |archive-url=https://web.archive.org/web/20120626024630/http://www.rothamsted.ac.uk/insect-survey/STPhorodon_humuli.php |archive-date=26 June 2012 |work=Rothamstead Insect Survey |publisher=Rothamstead Research}}</ref> so plum trees should not be grown in the vicinity of hop fields.

{{anchor|Corking}}Corking is the drying or withering of fruit tissue.<ref>{{cite web |last1=Benson |first1=N.R. |last2=Woodbridge |first2=C.G. |last3=Bartram |first3=R.D. |date=1994 |title=Nutrient Disorders in Tree Fruits |url=http://extension.wsu.edu/benton-franklin/wp-content/uploads/sites/27/2013/12/NutrientDisordersInTF-pnw0121e.pdf |access-date=9 September 2017 |publisher=Pacific Northwest Extension Publications}}</ref> In stone fruit, it is often caused by a lack of [[boron]] and/or [[calcium]].<ref>{{cite web |author=Day, Kevin |date=27 January 1999 |title=Peach and Nectarine Cork Spot:A Review of the 1998 Season |url=http://cetulare.ucanr.edu/files/77369.pdf |access-date=9 September 2017 |website=University of California Cooperative Extension – Tulare County |publisher=University of California, Davis}}</ref>

[[Gummosis]] is a nonspecific condition of stone fruits (peach, nectarine, plum, and cherry) in which gum is exuded and deposited on the bark of trees. Gum is produced in response to any type of wound – insect, mechanical injury, or disease.<ref>{{cite web |last1=Hartman |first1=John |last2=Bachi |first2=Paul |date=November 2005 |title=Gummosis and Perennial Canker of Stone Fruits |url=http://plantpathology.ca.uky.edu/files/ppfs-fr-t-08.pdf |access-date=9 September 2017 |website=Plant Pathology |publisher=University of Kentucky}}</ref>

''[[Dibotryon morbosum|Apiosporina morbosa]]'' is a major fungal disease in the Northern Americas, with many urban centres running black knot fungus management programs.<ref name="www.alberta.ca">{{Cite web |title=Black knot |url=https://www.alberta.ca/black-knot.aspx |access-date=2020-10-07 |website=www.alberta.ca}}</ref> This disease is best managed by physical removal of knot-bearing branches to prevent spore spread and immediate disposal of infected tissue.<ref name="www.alberta.ca" /> Chemical treatment is not largely effective, as trees can easily be re-infected by neighbouring knots.

''[[Laetiporus|Laetiporus gilbertsoni]]'' (commonly sulfur shelf and chicken of the woods), is a serious cubic brown rot parasite which attacks certain species of decorative red-leaf plum trees in the genus ''Prunus'' on the Pacific coast of North America.<ref name="laetiporus1">{{Cite web |title=Chicken of the Woods (Laetiporus sulphureus species complex) |url=https://edis.ifas.ufl.edu/publication/PP358 |access-date=2023-10-21}}</ref><ref name="laetiporus2">{{Cite web |title=Yellow tree fungus on very old plum tree #246036 |url=https://ask2.extension.org/kb/faq.php?id=246036 |access-date=2023-10-18 |website=ask2.extension.org}}</ref>