I have two peach trees and both have peach leaf curl. One of the trees
has very few leaves and most are affected.
My nursery gave me Growmore Organic Seaweed extract to spray on the leaves.
It does not say on the bottle it is designed for this type of application
but I have seen reference to its use on nursery sites.
On Tue, 12 Apr 2005 14:52:02 +0000, grinder wrote:
Good day, I'm unsure what the seaweed extract will do against a fungal
infection. Maybe they have information that I don't. Either way, the tree
with the most infection maybe a loss. It really depends the size and age
of the tree.
Peach leaf curl:
Click Tree Fruits> Peach
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Peach leaf curl is a fungal disease affecting primarily the leaves and
shoots. Fruit is occasionally attacked. Young leaves develop yellow to
reddish discoloration and become thickened, crisp, and crinkled. Affected
leaves are curled and deformed. A white powdery coating of the fungus
later develops on infected leaves. Infected leaves either turn yellow and
drop or remain on the tree, turning dark brown as the season progresses.
Infected green shoots become thickened and distorted. Fruits may show
swollen, reddish areas on the surface. These areas lack the normal peach
fuzz. The fungus overwinters on twigs and buds. This disease is a major
problem of peaches in western Washington. Severe leaf drop affects fruit
production, reduces vigor of trees, and increases susceptibility to winter
Select Non-chemical Management Options as Your First Choice!!
* Plant disease-tolerant or resistant varieties. 'Krummel', 'Muir',
and 'Redhaven' are reported to be tolerant. 'Rosy Dawn' is somewhat
resistant. 'Frost' is disease-resistant and is recommended for
planting in western Washington. However, it has no juvenile resistance
and must be protected during the first 2 to 3 years. * Remove infected
leaves when they first appear prior to sporulation of the fungus.
Destroy infected material.
Apply a fungicide during the first week of January. Make 2 to 3 additional
applications at 3- to 4-week intervals. If weather is cool and wet, apply
fungicides at 3-week intervals. If the weather is warm and dry, apply
fungicides at 4-week intervals.
* Bonide Fung-onil Multi-Purpose Fungicide R-T-U * Cooke Kop-R-Spray
* Dexol Bordeaux Powder
* Hi-Yield Bordeaux Mix Fungicide
* Hi-Yield Lime Sulfur Spray
* Lilly Miller Microcop Fungicide
* Lilly Miller Polysul Summer & Dormant Spray Conc * Monterey
Liqui-Cop Copper Fungicidal Garden Spray * Ortho Multi-Purpose
Fungicide Daconil 2787 Conc * This list may not include all products
registered for this use.
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This information is for washington state. The spray times for your area
I seriiously doubt if the prodfuct will aid the peach leaf curl. It is
generally accepted that there is nothing you dan do to stop or slow the
curl for this year. During the winter dormant season you can spray to
prevent curl for the coming season.
I would quickly lose faith in your nursery.
It's not just my nursery:
Kelp-based seaweed products may also be applied as a foliar spray. Naturally
occuring hormones present within the seaweed interfere with Taphrina
development. Susceptibility to Taphrina may also be linked with a magnesium
deficiency, a nutrient present in kelp. In an experiment comparing tree
blocks sprayed with copper, lime-sulfur or kelp product, the kelp sprayed
trees sustained heavier leaf curl damage but refoliated faster and after
several seasons was reduced to levels close to those treated with
fungicides. "Maxicrop" is a registered kelp product that is not phytotoxic
or toxic residue leaving. Spraying Maxicrop twice a month is most effective
Peach tree leaf curl: This is a common disease of peach trees. Sprays of
horsetail tea, garlic (look further down the page for recipes) and seaweed
can help to prevent this problem. Growing chives underneath them also helps.
Peach leaf curl Preferred Controls
Apply dormant sprays of lime-sulphur or copper just before bud break to kill
overwintering spores in bud scales
Apply fixed copper sprays in September, after harvest
Pick and destroy all affected leaves as soon as symptoms are visible to
prevent the fungus from reproducing
Spray liquid seaweed extracts at least once a month during the growing
season; these have been shown to reduce damage, possibly by providing
micronutrients to trees
wow i have learned somethin there ty very much
in UK they say leaf curl comes with the april rain and if ya protec
new foliage until after May ya won t get affected....as if that
possible covering trees from the rain.
maxicrop i am a big big fan of...its so expensive here. reminds me on
of the very first experiences as a professional gardener was to appl
maxicrop out of a big mobile water tank to many many urns in a Roya
Park in London...turned out the black stuff i was handed by the ol
gimp from the stores was sump oil....but nothing died
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