WEED CONTROL 



Plant 



Floating plants: 



Duckweed 



Filamentous algae. . 

 Water hyacinth 



Emergent plants: 



Alligatorweed 



Burreed 



Cattail 



Cow lily (yellow 



lily). 



Duckpotato 



Giant cutgrass 



Grass (most kinds). 



pond 



Johnson grass . 



Lotus 



Maidencane... 



Parrot feat her 



Reed's canary-grass_ 



Smartweed 



Softstem bulrush 



Squarestem bulrush 



Water chestnut 



Watercress 



Weakrush 



White waterlily 



Submerged plants: 



Bladderwort 



Chara (muskgrass) 



Coontail 



Curly leaf pond weed 



Fineleaf pond weed 



Leafy pond weed 



Naiads 



Parrotfeather 



Water crowfoot 



Water milfoil 



Water purslane 



Water stargrass 



Waterweed (Anacharis)_ 



Woody plants: All species. 



Chemical agent 



2,4-D 



Copper sulfate - 

 2.4-D 



.do_ 



.do-, 

 .do'. 

 .do__ 



-do- 

 -do. 



Sodium TCA. 



2,4-D. _ 

 do. 



Sodium TCA. 



2,4-D 



Sodium TCA. 



2,4-D_. 



do. 



do. 



Sodium arsenite. 



2,4-D.. 

 do. 



-do. 



Sodium arsenite - 

 Copper sulfate . _ 

 Sodium arsenite. 



do 



do 



do 



.do. 



do. 



_do. 



do. 



do. 



do. 



do- 



2,4,5-T_ 



Application 



1 % solution in oil.^ 



3 lbs. of crystals per 1,000 sq. ft. 



0.5% solution in oil.^ 



1 % solution. 



Do. 

 0.5% solution in oil. 2 

 1 % solution in oil.^ 



1% solution. 



1 % solution in oil.^ 



7 oz. per 5 gal. of water (1% 



solution). 

 1 % solution in oil. 2 

 0.5% solution in oil.^ 

 1 lb. dry powder per gal. of 



water.* 

 0.5% solution in oil.^ 

 1 lb. dry powder per gal. of 



water.* 

 1 % solution. 

 1 % solution in oil. 2 

 0.5% solution in oil.^ 

 1 lb. powdered sodium arsenite 



plus 1 lb. sodium chlorate in 



1 gal. of water to 150 sq. ft. 



1 % solution. 



Do. 

 2% solution in oil.^ 



2.5 p. p. m.5 



3 lb. of cry.stals per 1,000 sq. ft. 



2 p. p. m.5 

 2.5 p. p. m.s 



2 p. p. m.8 



D0.5 

 2.5 p. p. m.5 



3 to 4 p. p. m.5 

 3 p. p. m.5 



3 to 4 p. p. m.5 



Do.* 

 2.5 p. p. m.5 

 2 to 4 p. p. m.5 



2.3 qt. of 44% esters per 100 gal. 

 of water.' 



1 In water solution, unless otherwise specified. 



2 Refer to dilution table, p. 48. 



' 3 oz. Esteron 44 in 1 gal. of kerosene or fuel oil, plus a detergent, is very effective 

 on cattails and rushes. Highly volatile and should not be used if damage to adajacent 

 croplands probable, in which case use instead Estericide D-4. 



* Effective if sprayed twice when pond is dry. 



* Liquid form is most convenient; for example, 5}i pt. of Atlas "A" (contains 

 4 lb. /gal. AS2O3, the active ingredient) per acre-foot equals 1 p. p. m. Do not treat 

 more than one-third of pond area at a time because of danger of oxygen depletion. 

 See table, p. 48, for concentrations. 



8 Spray during active growing season and thoroughly wet the plants. Include a 

 detergent in the solution. 



47 



