Art Burrell, working in the Champlain Valley of NY where spring temperatures 
are often cool, would agree with you.  The sentences after the section that I 
quoted in the previous post says:
 “We have a period up to 60 or 70 hours, after the start of theinfection 
period, during which a heavy application of lime sulfur may prevent the 
appearance of lesions. Inevitably there will be some injury from the use of 
lime sulfur. Even in the absence of visible scorch, food manufacture by leaves 
is cut down for a few days by lime sulfur. This apperas to be chiefly from that 
part of the spray that reaches the lower survaces of the leaves. The injury is 
worst under high temperature, slow drying conditions, and on sensitive 
varieties such as Baldwins. Low-vigor trees have poor ability to recover from 
lime sulfur injury.”

I thought that I had read elsewhere that liquid-lime sulfur might provide up to 
4 days (96-hr) of post-infection activity, but perhaps that was a figment of my 
imagination.  On the other hand, you might eliminate scab on young leaves if 
you spray lime sulfur with a bit of oil while leaves are still wet, thereby 
causing enough burn to make the scab-infected leaves (and a probably a lot of 
other leaves) fall off of the tree before scab can begin sporulate :)

Incidentally, a product called Sulforix is being promoted as an alternative to 
liquid lime sulfur, but so far as I know it will not be any safer or reach back 
any futher than the old lime sulfur that Art Burrell was using in the 1940’s.

On Apr 7, 2016, at 1:18 PM, Vincent Philion 
<<>> wrote:

If you worry about Captan phytotoxicity, then you should also worry about LLS 
being phytotoxic under the same conditions. Liquid lime sulfur is a ’normal’ 
(ie not emergency) choice for post infection (kickback). However, I wouldn’t 
trust it 96 hours after beginning of rain, unless the temperature was very low.

Typically, we use DH (degree-hours) to describe the post infection efficacy.

In Celsius, we consider LLS good for 250 DH, meaning 25 hours at 10°C. This is 
calculated once the infection is started.

If you calculate from the beginning of the rain, then about 400DH (40 hours at 
10, or 80 hours at 5°C)

hope this helps.


Le 7 avr. 2016 à 12:56, David Kollas 
<<>> a écrit :

Does anyone have enough experience with liquid lime sulfur to comment on it as 
an emergency
choice for application before rains have stopped during the current long 
infection period?  It is listed as
having 72-96 hours back-action in the New England Tree Fruits Management Guide.
In my particular situation, Half-Inch Green stage tissues were exposed many 
hours during two of
the previous three nights to 18-20 degrees F, and are probably extra sensitive 
to captan penetration
and phytotoxicity.

David Kollas
Kollas Orchard

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Vincent Philion, agr., M.Sc.
Microbiologiste/Phytopathologiste (pomiculture)

Institut de recherche et de développement en agro-environnement
Research and Development Institute for the Agri-Environment<>

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