Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
Old 10-07-2003, 04:56 AM
Some One
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

Hey all!

We planted a "Red Fall" apple tree (about 6' tall) about a month ago.
Tree seems healthy, but we recently noticed that the leaves are
starting to curl up and some have white patches. These patches look
dusty, but aren't. There are also a few leaves that just turn yellow
and come off the tree VERY easily. Finally, I've also noticed some
leaves have some small rust/brown spots.

We're zone 3A in Calgary, Alberta, Canada.

We haven't had much luck finding a decent "plant diseases and pest"
book or website.

Any idea what is happening and how to deal with it?

Thanks!


  #2   Report Post  
Old 10-07-2003, 05:08 AM
Bob Provencher
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

"Some One" wrote in message
. ca...
We planted a "Red Fall" apple tree (about 6' tall) about a month ago.
Tree seems healthy, but we recently noticed that the leaves are
starting to curl up and some have white patches. These patches look
dusty, but aren't. There are also a few leaves that just turn yellow
and come off the tree VERY easily. Finally, I've also noticed some
leaves have some small rust/brown spots.



Sounds like powdery mildew.

--
Bob Provencher
ICQ 881862
AIM bproven




  #3   Report Post  
Old 10-07-2003, 07:44 AM
Sherwin Dubren
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

Hi,
You don't mention if you ever spray your tree for insects and fungus.
You need to be on a regular spray schedule to both keep the tree healthy
and preserve the apples when they come. Try a general orchard spray
from
someone like Bonide, and stick to a schedule of about every 10-14 days.
Wait for a calm day with no rain in the near forecast. Best protection
is a face mask with filters and protective clothing. Look into dormant
oil spraying for next Spring, as well. Don't spray when there are
blossoms on the tree (it will kill all the beneficial bee pollinators).

Sherwin Dubren
MidFEx

Some One wrote:

Hey all!

We planted a "Red Fall" apple tree (about 6' tall) about a month ago.
Tree seems healthy, but we recently noticed that the leaves are
starting to curl up and some have white patches. These patches look
dusty, but aren't. There are also a few leaves that just turn yellow
and come off the tree VERY easily. Finally, I've also noticed some
leaves have some small rust/brown spots.

We're zone 3A in Calgary, Alberta, Canada.

We haven't had much luck finding a decent "plant diseases and pest"
book or website.

Any idea what is happening and how to deal with it?

Thanks!

  #4   Report Post  
Old 10-07-2003, 07:56 AM
Sherwin Dubren
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

Forgot to mention,

Ortho makes a good book on plant diseases for the home garden,
which includes fruit trees. There should be plenty of material on the
Web, if you plug in 'fruit trees' 'diseases' 'spraying' etc. Also, try
and find if a local University extension service or Botanical Garden
has a Web site. Here is one nearby me in Illinois to try:

http://www.mortonarb.org/ {Morton Arboretum}

and follow the links for plant information.

Hope this helps,

Sherwin Dubren

Some One wrote:

Hey all!

We planted a "Red Fall" apple tree (about 6' tall) about a month ago.
Tree seems healthy, but we recently noticed that the leaves are
starting to curl up and some have white patches. These patches look
dusty, but aren't. There are also a few leaves that just turn yellow
and come off the tree VERY easily. Finally, I've also noticed some
leaves have some small rust/brown spots.

We're zone 3A in Calgary, Alberta, Canada.

We haven't had much luck finding a decent "plant diseases and pest"
book or website.

Any idea what is happening and how to deal with it?

Thanks!

  #5   Report Post  
Old 10-07-2003, 02:08 PM
Pam
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

This is totally unnecessary for a home fruit grower and can be downright
dangerous. Powdery mildew (which the problem certainly sounds like) does not
require treatment - I have a Gravenstein apple which is a powdery mildew
magnet and get bumper crops of perfectly unflawed apples each year. If any
spraying of fruit trees is required, a dormant season spray will control
overwintering pests and insect eggs as well as smothering of fungal spores.
Best to research and purchase fruit trees which tend to be more resistant to
fungal problems like scab or mildew or live with the problems, which for the
most part are cosmetic and have little effect on fruit production.

pam - gardengal



Sherwin Dubren wrote:

Hi,
You don't mention if you ever spray your tree for insects and fungus.
You need to be on a regular spray schedule to both keep the tree healthy
and preserve the apples when they come. Try a general orchard spray
from
someone like Bonide, and stick to a schedule of about every 10-14 days.
Wait for a calm day with no rain in the near forecast. Best protection
is a face mask with filters and protective clothing. Look into dormant
oil spraying for next Spring, as well. Don't spray when there are
blossoms on the tree (it will kill all the beneficial bee pollinators).

Sherwin Dubren
MidFEx

Some One wrote:

Hey all!

We planted a "Red Fall" apple tree (about 6' tall) about a month ago.
Tree seems healthy, but we recently noticed that the leaves are
starting to curl up and some have white patches. These patches look
dusty, but aren't. There are also a few leaves that just turn yellow
and come off the tree VERY easily. Finally, I've also noticed some
leaves have some small rust/brown spots.

We're zone 3A in Calgary, Alberta, Canada.

We haven't had much luck finding a decent "plant diseases and pest"
book or website.

Any idea what is happening and how to deal with it?

Thanks!




  #6   Report Post  
Old 10-07-2003, 02:20 PM
Pam
 
Posts: n/a
Default Apple tree getting white patches under the leaves?



Sherwin Dubren wrote:

Forgot to mention,

Ortho makes a good book on plant diseases for the home garden,
which includes fruit trees.


Only good if you buy into Ortho's product philosophy. The AHS and Rodale
publish far superior disease diagnostic books for the home gardener without
the pesticide marketing angle. Or refer to your own country extension
office for disease information and treatment recommendations.

pam - gardengal

  #7   Report Post  
Old 10-07-2003, 03:56 PM
Some One
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

Argh!

This sounds like work... : )

Complete newbie to outdoor gardening. Inside we have at least 70+
plants... All they get is water and the occasional fertilizer and
they're all healthy. Doesn't it work that way outdoors too???

I didn't plan on doing any spraying on the tree... maybe once it was
large enough to worry about getting fruit from it. Right now I just
want it to be healthy and grow. I'd pluck off any apples I see started
to keep the nourishment inside the tree.


"Sherwin Dubren" wrote in message
...
Hi,
You don't mention if you ever spray your tree for insects and

fungus.
You need to be on a regular spray schedule to both keep the tree

healthy
and preserve the apples when they come. Try a general orchard spray
from
someone like Bonide, and stick to a schedule of about every 10-14

days.
Wait for a calm day with no rain in the near forecast. Best

protection
is a face mask with filters and protective clothing. Look into

dormant
oil spraying for next Spring, as well. Don't spray when there are
blossoms on the tree (it will kill all the beneficial bee

pollinators).

Sherwin Dubren
MidFEx

Some One wrote:

Hey all!

We planted a "Red Fall" apple tree (about 6' tall) about a month

ago.
Tree seems healthy, but we recently noticed that the leaves are
starting to curl up and some have white patches. These patches

look
dusty, but aren't. There are also a few leaves that just turn

yellow
and come off the tree VERY easily. Finally, I've also noticed some
leaves have some small rust/brown spots.

We're zone 3A in Calgary, Alberta, Canada.

We haven't had much luck finding a decent "plant diseases and

pest"
book or website.

Any idea what is happening and how to deal with it?

Thanks!



  #8   Report Post  
Old 10-07-2003, 04:32 PM
Marley1372
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

To comment on the general orchard sprays- They usually contain one or more
insecticides as well as a fungicide. Why spray with one of these when you have
no insects prsent? Its a waste of money and bad for the environment.

Toad
  #9   Report Post  
Old 11-07-2003, 02:56 AM
Sherwin Dubren
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

Hi Pam,
You must live in a very unusual area dormant spray does the job.
Here
in the Chicago area, if you don't spray on a regular schedule, you loose
most of your fruit to things like apple maggots, codling moths, etc.,
just
to name a few.

Sherwin

Pam wrote:

This is totally unnecessary for a home fruit grower and can be downright
dangerous. Powdery mildew (which the problem certainly sounds like) does not
require treatment - I have a Gravenstein apple which is a powdery mildew
magnet and get bumper crops of perfectly unflawed apples each year. If any
spraying of fruit trees is required, a dormant season spray will control
overwintering pests and insect eggs as well as smothering of fungal spores.
Best to research and purchase fruit trees which tend to be more resistant to
fungal problems like scab or mildew or live with the problems, which for the
most part are cosmetic and have little effect on fruit production.

pam - gardengal

Sherwin Dubren wrote:

Hi,
You don't mention if you ever spray your tree for insects and fungus.
You need to be on a regular spray schedule to both keep the tree healthy
and preserve the apples when they come. Try a general orchard spray
from
someone like Bonide, and stick to a schedule of about every 10-14 days.
Wait for a calm day with no rain in the near forecast. Best protection
is a face mask with filters and protective clothing. Look into dormant
oil spraying for next Spring, as well. Don't spray when there are
blossoms on the tree (it will kill all the beneficial bee pollinators).

Sherwin Dubren
MidFEx

Some One wrote:

Hey all!

We planted a "Red Fall" apple tree (about 6' tall) about a month ago.
Tree seems healthy, but we recently noticed that the leaves are
starting to curl up and some have white patches. These patches look
dusty, but aren't. There are also a few leaves that just turn yellow
and come off the tree VERY easily. Finally, I've also noticed some
leaves have some small rust/brown spots.

We're zone 3A in Calgary, Alberta, Canada.

We haven't had much luck finding a decent "plant diseases and pest"
book or website.

Any idea what is happening and how to deal with it?

Thanks!

  #10   Report Post  
Old 11-07-2003, 03:08 AM
Sherwin Dubren
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

I take it you are an organic fruit grower. There are several in my
fruit
growing club, and whenever I visit their places, I see loads of attacked
apples. There are some varieties which are somewhat disease resistant,
like the Williams Pride I grow, but the really good tasting apples are
not
of this type. I have no quams about spraying, but naturally one has to
take precautions to protect yourself. These chemicals break down with
time, and besides I do a careful job of washing the fruit before eating.

Sherwin

Pam wrote:

Sherwin Dubren wrote:

Forgot to mention,

Ortho makes a good book on plant diseases for the home garden,
which includes fruit trees.


Only good if you buy into Ortho's product philosophy. The AHS and Rodale
publish far superior disease diagnostic books for the home gardener without
the pesticide marketing angle. Or refer to your own country extension
office for disease information and treatment recommendations.

pam - gardengal



  #11   Report Post  
Old 11-07-2003, 03:08 AM
Sherwin Dubren
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

Again, I would like to know where you live where there are no insects.

Sherwin Dubren

Marley1372 wrote:

To comment on the general orchard sprays- They usually contain one or more
insecticides as well as a fungicide. Why spray with one of these when you have
no insects prsent? Its a waste of money and bad for the environment.

Toad

  #12   Report Post  
Old 11-07-2003, 01:56 PM
Pam
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

Spray products for insects pests like coddling moths and apple maggots are not
available to homeowners here in WA state - they are only available for commercial
orchard operations. The recommended control for these insects for homeowners is
through good sanitation and trapping. Besides, spraying for these insects, were it
available, will have no effect on the control of powdery mildew, which is the
topic in question.

pam - gardengal



Sherwin Dubren wrote:

Hi Pam,
You must live in a very unusual area dormant spray does the job.
Here
in the Chicago area, if you don't spray on a regular schedule, you loose
most of your fruit to things like apple maggots, codling moths, etc.,
just
to name a few.

Sherwin

Pam wrote:

This is totally unnecessary for a home fruit grower and can be downright
dangerous. Powdery mildew (which the problem certainly sounds like) does not
require treatment - I have a Gravenstein apple which is a powdery mildew
magnet and get bumper crops of perfectly unflawed apples each year. If any
spraying of fruit trees is required, a dormant season spray will control
overwintering pests and insect eggs as well as smothering of fungal spores.
Best to research and purchase fruit trees which tend to be more resistant to
fungal problems like scab or mildew or live with the problems, which for the
most part are cosmetic and have little effect on fruit production.

pam - gardengal

Sherwin Dubren wrote:

Hi,
You don't mention if you ever spray your tree for insects and fungus.
You need to be on a regular spray schedule to both keep the tree healthy
and preserve the apples when they come. Try a general orchard spray
from
someone like Bonide, and stick to a schedule of about every 10-14 days.
Wait for a calm day with no rain in the near forecast. Best protection
is a face mask with filters and protective clothing. Look into dormant
oil spraying for next Spring, as well. Don't spray when there are
blossoms on the tree (it will kill all the beneficial bee pollinators).

Sherwin Dubren
MidFEx

Some One wrote:

Hey all!

We planted a "Red Fall" apple tree (about 6' tall) about a month ago.
Tree seems healthy, but we recently noticed that the leaves are
starting to curl up and some have white patches. These patches look
dusty, but aren't. There are also a few leaves that just turn yellow
and come off the tree VERY easily. Finally, I've also noticed some
leaves have some small rust/brown spots.

We're zone 3A in Calgary, Alberta, Canada.

We haven't had much luck finding a decent "plant diseases and pest"
book or website.

Any idea what is happening and how to deal with it?

Thanks!


  #13   Report Post  
Old 11-07-2003, 02:08 PM
Pam
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

I am an organic gardener, period. I am also a horticultural consultant and make
my living, in part, by diagnosing and recommending treatment for plant diseases
and insect problems. My objection with using Ortho publications is that they
offer no alternative controls other than Ortho products, which, by and large, tip
towards the toxic end of the pesticide protocol. I promote IPM, which encourages
tolerance first and formost, then treatment via the least invasive measures that
prove effective. Jumping immediately onto the Ortho bandwagon overlooks scores of
other possible, less toxic options and is often unnecessary.

FWIW, there are many apple varieties which are very disease resistant as well as
delightfully edible - one's choices are not restricted to either constant
spraying or tasteless apples.

pam - gardengal



Sherwin Dubren wrote:

I take it you are an organic fruit grower. There are several in my
fruit
growing club, and whenever I visit their places, I see loads of attacked
apples. There are some varieties which are somewhat disease resistant,
like the Williams Pride I grow, but the really good tasting apples are
not
of this type. I have no quams about spraying, but naturally one has to
take precautions to protect yourself. These chemicals break down with
time, and besides I do a careful job of washing the fruit before eating.

Sherwin

Pam wrote:

Sherwin Dubren wrote:

Forgot to mention,

Ortho makes a good book on plant diseases for the home garden,
which includes fruit trees.


Only good if you buy into Ortho's product philosophy. The AHS and Rodale
publish far superior disease diagnostic books for the home gardener without
the pesticide marketing angle. Or refer to your own country extension
office for disease information and treatment recommendations.

pam - gardengal


  #14   Report Post  
Old 12-07-2003, 06:32 AM
Sherwin Dubren
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

Hi Pam,
The reason I referred the party to the Ortho book was twofold. One,
it
has some very nice pictures of attacked trees, which help to identify
what
is causing the problem. Two, I happen to have that book in my house and
am familiar with it. Yes, there are other references, but I wanted to
get
this person off the starting line.

It is a sad fact of life that the most tasteful apples do not have
disease
resistance built in. Maybe in the process of developing these disease
resistant
apples destroys some of the flavor. As I mentioned before,
I grow Williams Pride (a disease resistant apple) which is not a
bad tasting apple, but it doesn't have the full flavor of one of my
heritage apples, Hudsons Golden Gem.

Here in the Midwest (and perhaps elsewhere),
we have a big problem with codling moths and apple maggots. I tried
spraying
with Rotenone, which is made from all natural ingredients.
Unfortunately, it did not do the job to stop these pests,
plus it kept clogging up my sprayer. To me it is a question of
either very tasteful apples, or going the organic/natural resistant
path.


Sherwin Dubren

Pam wrote:

I am an organic gardener, period. I am also a horticultural consultant and make
my living, in part, by diagnosing and recommending treatment for plant diseases
and insect problems. My objection with using Ortho publications is that they
offer no alternative controls other than Ortho products, which, by and large, tip
towards the toxic end of the pesticide protocol. I promote IPM, which encourages
tolerance first and formost, then treatment via the least invasive measures that
prove effective. Jumping immediately onto the Ortho bandwagon overlooks scores of
other possible, less toxic options and is often unnecessary.

FWIW, there are many apple varieties which are very disease resistant as well as
delightfully edible - one's choices are not restricted to either constant
spraying or tasteless apples.

pam - gardengal

Sherwin Dubren wrote:

I take it you are an organic fruit grower. There are several in my
fruit
growing club, and whenever I visit their places, I see loads of attacked
apples. There are some varieties which are somewhat disease resistant,
like the Williams Pride I grow, but the really good tasting apples are
not
of this type. I have no quams about spraying, but naturally one has to
take precautions to protect yourself. These chemicals break down with
time, and besides I do a careful job of washing the fruit before eating.

Sherwin

Pam wrote:

Sherwin Dubren wrote:

Forgot to mention,

Ortho makes a good book on plant diseases for the home garden,
which includes fruit trees.

Only good if you buy into Ortho's product philosophy. The AHS and Rodale
publish far superior disease diagnostic books for the home gardener without
the pesticide marketing angle. Or refer to your own country extension
office for disease information and treatment recommendations.

pam - gardengal

  #15   Report Post  
Old 13-07-2003, 02:08 AM
Sed5555
 
Posts: n/a
Default Apple tree getting white patches under the leaves?

we recently noticed that the leaves are
starting to curl up and some have white patches.


Could be Wooly Apple Aphids.The aphids and their nymphs are a reddish brown and
they produce fuzzy white filaments in patches. The leaves can become yellowed
because the aphids are sucking insects that drain the chlorophyll from the
them. The small rust/brown spots could be rust (a fungus) or merely the aphids
themselves. These aphids are difficult to get rid of because they have a waxy
coating that is not easily penetrated. Control usually requires professional
application of pesticides.
sed5555
Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Apple tree, brown patches on leaves? Barb[_6_] United Kingdom 2 03-06-2011 05:54 PM
Zosterifolia : Leaves have dark patches and some transparent and new growth white before being g Philippe Lemaire \(remove oldies\) Freshwater Aquaria Plants 0 14-01-2004 11:03 PM
Zosterifolia : Leaves have dark patches and some transparent and new growth white before being g Philippe Lemaire \(remove oldies\) Freshwater Aquaria Plants 0 13-01-2004 11:38 PM
Zosterifolia : Leaves have dark patches and some transparent and new growth white before being g Philippe Lemaire \(remove oldies\) Freshwater Aquaria Plants 0 11-01-2004 01:04 PM
Zosterifolia : Leaves have dark patches and some transparent and new growth white before being g Philippe Lemaire \(remove oldies\) Freshwater Aquaria Plants 1 06-01-2004 12:10 AM


All times are GMT +1. The time now is 09:20 AM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 GardenBanter.co.uk.
The comments are property of their posters.
 

About Us

"It's about Gardening"

 

Copyright © 2017