[Arid_gardener] Re: Ash Anthracnose

[Olin Miller]

----- Original Message ----- 
From: <vraymond at azdps.gov>
To: <arid_gardener at Ag.arizona.edu>
Sent: Thursday, June 07, 2007 4:29 PM
Subject: [Arid_gardener] Question from Home-Hort WWW page


> Vicki Raymond
> 85302
> vraymond at azdps.gov
>
> What is the best treatment for ash anthracnose?
===============================

Googling brings up a lot of dot edu sites dealing wih this disease.  For
example, from:
http://www.extension.umn.edu/yardandgarden/YGLNews/YGLN-June0101.html#ash

"Management of ash anthracnose requires several approaches. Remove and
dispose of infected foliage and cankered branches by raking and pruning.
Failure to do so will allow the fungus to reinfect whenever weather
conditions favor spore release. Because the tree may releaf, and in the
process use its carbohydrate reserves, it is very important to maintain tree
vigor and prevent the tree from declining. Fungicide use is only necessary
if severe defoliation has occurred in three of the last five years. Both
thiophanate-methyl (Cleary's 3336) and Chlorothalonil (Daconil 2787) are
labeled for use, with spray periods lasting from May through June when
weather is cool and wet. To maintain tree vigor, fertilize, water and mulch
trees to protect and encourage solid growth and keep the nuisance problem of
anthracnose from developing into a tree killer. "

Olin Miller, Master Gardener Volunteer
U of A Cooperative Extension, Maricopa County AZ