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acre l gal/acre algae was achieved Anacharis canadensis aquatic plants Cladophora control of Chara control of filamentous control Spirogyra sp...no curtailment of phytoplankton day following treatment diatoms diquat residues drawdown treatment drawdown trial Drepanocladus sp filamentous algae flagellated gal/acre June 20 gal/acre June 2l gallons per acre herbicide June 23 l.5 ppm l/4 acre l0 wks lbs per acre Lemna minor Mougeotia sp ONTARIO FARM PONDS P.pectinatus...regrowth phyto plankton pondweed Potamogeton pectinatus ppm June ppm simazine prior to treatment provided seasonal control quantitative dredge samples Ranunculus sp rate of 0.5 reduction regrowth of Chara residues in pond soybean soybean plants sp no control Spirogyra sp Stonewort stream stream-fed pond submerged vascular plants Table test plants tomato plants total elimination total volume treatments treated in l966 treated with simazine treatment in l967 treatment with fenac TREATMENTS WITH SIMAZINE unaffected vegetation water on tomato Water samples collected weeks after treatment wks.-elimination