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Discussion in 'Pesticide & Herbicide Application' started by mikey, Apr 6, 2002.
and what does it do?when dshould u put it down when cleaning a flower bed or mulch?
It prevents seeds from germinating by forming a vapor barrier. So it will stop weeds from taking over. You can apply it anytime. If you plan on mulching, do that first, then apply the Preen.
They also have Preen for ground cover.
You can buy a 50 lb bag of pendimethalin from Lesco for the same price as the coffee-can sized carton of relabeled pendimethalin under the Preen brand name.
If you are a professional, stay away from the homeowner stuff.
First off if it has an EPA lable, you need a licence to apply it in most states. This means you need one to apply it on some one elses yard. Next this belongs in the pesticide forum not here in landscape.
Maybe herbicide, but it doesn't really kill weeds..... hmmmm
Wonder where the insecticide questions belong?
Pesticide is a broad term as is 'Pest'. Some people could even be considered such, from time to time.
Read the Label. READ THE LABEL. READ THE LABEL!!!
Consumer Preen is (at least used to be) trifluralin, a common old preemergent. Professional Preen is the same product as Snapshot, a combo of trifluralin and isoxaben. Lebanon has bought license from Dow to sell it as Professional Preen, but the Lebanon product is a lower A.I. percentage (1.5% I think), to reduce the chance of overapplication. Perhaps Preen now contains pendimethalin, but pre-ems operate as chemical bonds near soil surface, not as a vapor; vapors would soon dissapate in almost any soil.
And according to FIFRA, the most recent federal legislation regulating pesticides, a pesticide is any product, chemical or biological, that is used to control a pest. A pest is any undesireable problem, and may be a weed, insect, disease, rodent, animal, etc. Therefore pesticides include herbicides, insecticides, fungicides, rodenticides, etc.
So if you are going to use any chemical or biological product on a lawn or landscape, except fertilizer, you need to be licensed by your state pesticide office. And many states even have special requirements and reporting procedures for fertilizing.