WSU Extension


Anthracnose and Bull's-eye rot 
Bitter pit 
Crown and collar rot 
Crown gall 
Cytospora canker 
Fire blight 
Fruit russeting 
Nectria canker (European canker) 
Nectria twig blight (Coral spot) 
Perennial canker (Bull's-eye rot) 
Phytophthora fruit rot 
Powdery mildew 
Virus diseases 
Apple ermine moth 
Apple maggot 
Apple-and-thorn skeletonizer 
Brown marmorated stink bug 
Codling moth 
Cutworms and armyworms 
Fruittree leafroller 
Lecanium scale 
San Jose scale 
Spider mites 
Tent caterpillars 
Tentiform leafminer 

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Caption: Phytophthora fruit rot
Photo by: G.G. Grove
Apple : Phytophthora fruit rot
(revision date: 5/20/2014)

Phytophthora fruit rot is caused by a soilborne fungus which can also be found in and carried by irrigation water. Infection occurs when water contacts fruit on low-hanging limbs or when overhead watering is used. Firm tan spots approximately 1" or more in diameter develop on infected fruit. If the infection moves up into the wood, a dieback of one-year-old wood resembling fire blight can occur. This fungus can also infect pears. Phytophthora fruit rot occurs sporadically and is of minor importance.
Management Options

Non-Chemical Management
  • Avoid overhead watering.
  • Reduce time fruit is wet from irrigation to less than one hour (this includes actual irrigation time as well as drying time).
  • Do not get water on fruit within 10 days of harvest.
Select non-chemical management options as your first choice!

Chemical Management

None recommended


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Caption: Phytophthora fruit rot
Photo by: G.G. Grove