Boyce Tankersley
Thu, 06 Nov 2003 11:31:05 PST
Hi Carolyn:

I succesfully used Treflan about 15 years ago - it's an agricultural pre-emergent herbicide sold at relatively inexpensive prices to farmers.

I varied application rates when making applications to different soil textures. The local extension agent was helpful in recommending rates for the different soil types based upon local farmers use in the agricultural fields.

At recommended rates (on the label) I observed some toxicity in a couple of genera of woody plants but none on monocots (Chaenomeles - the flowering quince was one, I can't recall the second genus).

The pesiticide laws since then have changed significantly and I am not sure this product is still labeled for landscape use.

Regardless, pesticides, whether they be herbicides, insecticides, etc. are tested on a limited number of different kinds of plants before they are released. The odds are the number of bulbous taxa was limited.

I agree with Roy, test on a small area using recommended application rates on the label (of whatever you end up using) before making widespread applications.

Boyce Tankersley

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