Experimental Use of Silvex and Other Aquatic Herbicides in Georgia Farm Ponds

The results of two years experimental weed control in Georgia Farm Ponds using silvex,2 propylene glycol butyl ether ester, dalapon, sodium salt of 2,2dichloropropionic acid; 2, 4-D granules of iso-octyl ester of 2,4-dichlorophenoxy acetic acid. Residual control and overall effectiveness is evaluated over a twoyear period on acquatic weeds in approximately 100 ponds. Preliminary screening of Inverton, an invert emulsion of 2, 4, 5-trichlorophenoxy acetic acid; Carlon, a solution of dalapon and silvex; and simazine, 2-chloro-4, 6 bis( ethylamino) -S-trizaine are presented. Different concentrations were used and observations made during 1958 and 1959. Results are presented for different herbicides and evaluation made for their effectiveness on specific aquatic weeds. Silvex appears to have the widest range of control for underwater and emergent aquatic weeds. Preliminary results indicate this chemical is as effective as sodium arsenite in many situations. Dalapon has given some degree of control for grasses and satisfactory control for cattails. Granular 2,4-D has given satisfactory control for water lilies and parrots feather (Myriophyllum brasiliense). Garton and Inverton look promising for the control of some aquatic weeds. Simazine has not been generally effective for control or eradication of higher aquatic plants in the concentrations listed.

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