gross at gross at
Fri Dec 3 17:30:25 EST 1999

     Faced with the same problem several years ago, and having a rooftop 
     greenhouse with open access to our main academic building which 
     made use of strong chemicals not particularly desirable, I adopted 
     an IPM approach that included insecticidal soap and beneficial 
     insects. I have had all of the below under control for the last 5 
     years using IPM.  Daily use of an insecticidal soap (and "mashing" 
     by hand and "piercing" with the assistance of a dissection needle) 
     provides good control for most species of all of the below, and I 
     supplement with thrice yearly releases of beneficial mites that eat 
     thrips and spider mites.  I had great success with a ladybug that 
     eats mealybugs, but it does not do well at this time of the year 
     (works best with long days).  I'm at the point where two hours of 
     my time per week for surveillance and spraying to control outbreaks 
     as they begin keeps everything under control.  You have to know 
     what the preferred host plants are for each pest and keep an eye on 
     them.  I also had to eliminate from our plant collection some 
     species that had morphologies that made it difficult for 
     insecticidal soap to penetrate into all the crevices.  Nontheless, 
     I maintain 250 species.  I'm in a space about 24 by 12 feet.
     Mike Gross, Ph.D.
     Assoc Prof Biology
     Biology Dept Chairperson
     Georgian Court College
     Lakewood, NJ

______________________________ Reply Separator _________________________________
Subject: greenhouse 
Author:  <rbingham at (Robin Bingham)> at ~internet
Date:    12/3/99 1:46 PM

I'm responsible for the small greenhouse we have here at Western State 
College. We have a fairly serious bug problem (aphids, mealy bugs, scale) 
that I need some help with. We haven't used any insecticides since I 
started here about 3 years ago. Until now, we've been able to keep things 
more or less under control using less drastic measures. However, I feel 
we've reached the point where we need to do something more serious. Does 
anyone have any suggestions about an affordable, reasonably safe thing to 
try?? We'd like to do it ourselves rather than hiring out.

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