Most wood decay fungi are Basidiomycetes (bracket, shelf and conk fungi). To 
prevent the growth of wood decay fungi in lumber, the wood needs to be below 
(if memory serves) about 5% water content. So, yes, they like wood to be moist.
Water molds are Oomycetes, considered more closely aligned with algae, and 
include Phytophthora, Pythium and the downy mildews. For apple growers - 
Phytophthora root and crown rot is your least favorite water mold.
Juliet E. Carroll, PhD
Fruit IPM Coordinator, New York State Integrated Pest Management (IPM) Program
Cornell University, 630 W. North St., Geneva, NY 14456
315-787-2430 (Fax -2360),
Cornell Cooperative Extension provides equal program & employment opportunity
Diversity and inclusion are a part of Cornell University's heritage

-----Original Message-----
From: apple-crop [] On Behalf Of 
Tom Auvil
Sent: Tuesday, March 21, 2017 11:10 AM
To: 'Apple-Crop discussion list' <>
Subject: Re: [Apple-Crop] Pruning cuts


Many if not most wood decay fungi are 'water molds' that need moisture and 
temperature to germinate and grow.  Most latex / exterior paints are 
manufactured to 'seal' things up and can increase the incidence of disease.
A WSU pathologist recommended a copper spray or adding copper to a white wash 
would be better than a sealing paint. Grafters use sealants  to encourage the 
scion and trunk to callus and knit together before the tissues dry out and 
cease activity. Another disease management factor is if there are a number of 
trees/trunks with wood decay activity in the orchard. The more disease in the 
field increases risk and encourages treatment. 

Tom and Rose Auvil
PO Box 408
Orondo, WA 98843

-----Original Message-----
From: apple-crop [] On Behalf Of 
Sent: Thursday, March 09, 2017 11:47 AM
To: Apple-Crop
Subject: [Apple-Crop] Pruning cuts

We have made some large cuts,
4-6" seems like some latex paint would be helpful (apples). 
Realize standard advice says no
But ready for advice. Thanks
77 tues forecast 15 tomorrow night in central Iowa. 

Regards, Dean

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