[NAFEX] pear phytotoxicity question

Doreen Howard gardendiva at charter.net
Wed May 5 15:53:08 EDT 2004


Bruce,
It's the neem that caused the foliage burn and death.  It is phototoxic when
sprayed during the day when the sun is at it's most intense.  The best time
to spray neem is early mornings before 9 a.m. and after 6 p.m.  I'm
surprised that there was not a caveat on the product label.  I buy neem seed
oil in the pure form.  It's Green Light brand and labeled 'Fruit, Nut and
Vegetable Spray.'  And there is cautionary language on the label about
spraying during the day and when to spray to avoid killing beneficial
insects.
Doreen Howard

----- Original Message ----- 
From: "Kristina & Bruce" <herenorthere at lycos.com>
To: <nafex at lists.ibiblio.org>
Sent: Wednesday, May 05, 2004 1:44 PM
Subject: [NAFEX] pear phytotoxicity question


> I sprayed my trees this weekend and three pear varieties got some serious
damage, being almost defoliated.  The blackened ones are a Tate, Tyson, and
a branch of Bergamote d'Hiver on my quince.  The Seckel tree and branches of
Winter Nelis and another French variety living on the quince weren't
bothered.  Nor were the quince, my various plums and apples
>
> The spray was a blend of Copper Soap (GardensAlive), Neem oil, and Bt, all
at label dilutions, plus 1/2 of the recommended growing season dilution of
Crocker's fish oil as a sticker-spreader.  I frequently use this blend, with
the exception of the Bt, which I rarely use.  Can Bt cause or contribute to
phytotoxicity?
>
> Bruce Wittchen
> 1/2 mile beyond Hartford, CT
>
>
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