Main forum: DR care

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Imagecoconut
Jul 9, 2010 5:59 AM CST
Name: Melissa E. Keyes
St. Croix, U.S. Virgin Islands
Zone 11
Quote Dr Mark Dimmitt

The alcohol used for almost all plant sterilization is 70% isopropyl (rubbing
alcohol). [for grafting purposes]

I have found that nearly all chemicals damage adenium foliage and flowers at
high temperatures. Even the "safe" pure horticultural oil (stylet oil)
defoliates them.

I spray late in the afternoon, but there is still damage from
the next day's heat.

Last week I had to spray for a late spider mite
infestation. I used dimethoate 400 and avermectin with a wetting agent. The
seedlings are in a greenhouse controlled to a maximum of 35 C (95 F); they had
only minor leaf damage. But the main adenium house was above 45 C (>113 F) the
next day, and most of the mature leaves fell off in the next few days.

Oddly, the pesticides are more harmful to old than new foliage. This has been a
consistent problem when I have to spray in summer heat, almost no matter which
pesticides I use.

The only one that seems to be nonphytotoxic is imidacloprid, [a systemic]
but it doesn't control mites. None of my other plants are damaged by these
treatments.

Adenium foliage seems to be very chemical-sensitive.
Melissa

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