greenhouse pesticides, a new idea

I have been buying Schultz Spray with 0.02% active pyrethrins (plus a sort of 
combination active also with the registration,  a booster) which is the 
common and easily purchased formula registered for indoor use.
This kills aphids on contact but needs to be repeated a week later before you 
see them as it is not able to find eggs or very small newly born aphids 
hidden in the folds of the growing tip of the plant or those in leaf axils.

Being unable to find Schultz spray one day last fall, I purchased Concern 
Multi-Purpose Insect Killer which has the same active ingredients.  Checked 
the active ingredients, pesticide registration and took it home for 
greenhouse use.

Schultz reads on the label "water based, nonflammable."  Spraying it on any 
plant leaves no residue and it is moderately effective.

The Concern product has no inert ingredient information on the container nor 
could I find it on a quick search.  However, the Concern product does leave a 
shiny, almost slightly sticky residue which seems to have the ability to go 
on killing aphids and their progeny after one spray application.  This is 
lessens the amount of pyrethrin solution added to the greenhouse or indoor 
atmosphere and also saves money.

12 fl.oz. of Schultz is 3.99 here and 32 fl.oz. of Concern is 6.99.  With the 
larger Concern container, you do not have to make as many trips to the store.

I have been using Concern for this winter only so the observation is for just 
one season.  The residue seems to break down over a six week period so it not 
a problem for me.

Both companies are promoted by "organic" sites and catalogs. Concern is a 
brand name not seen in this area before so may be more difficult to find.  I 
have not seen Concern to purchase before this past fall.

The manufacturer is:

IntAgra, Inc.
Necessary Organics
8906 Wentworth Ave. So.
Minneapolis, MN 55420

If there is an adverse reason to not use a pesticide that remains on the 
plant for a while (providing it does not damage tissue), I don't know what it 
might be.  I don't seem to have killed anything with Concern this winter and 
have used much less treatment than with Schultz Spray.  You would not, of 
course, spray herbs or plants intended for food. 

Claire Peplowski
NYS z4

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