EMERGENT AND MARGINAL WEEDS 



(1) For control of cattails and bulrushes: (a) Low-volatile esters of 

 2,4-D at 4 to 6 pounds in a 1:20 oil-water enaulsion for a total volume of 

 150 to 300 gallons per acre applied as a foliage spray. The first spray- 

 treatment should be made just before heading stage of the weeds and re- 

 peated as necessary on regrowth. About 3 applications over a 2-year period 

 are necessary for complete control of these weeds, (b) Dalapon at 15 to 25 

 pounds per acre or amitrole at 8 to 10 pounds, applied at late heading or 

 post-heading stages and in late summer 2 to 4 weeks before first frost. 

 Addition of 5 to 10 gallons of oil per acre to the dalapon spray solution 

 greatly improves results in most situations. Repeated applications may be 

 necessary. These treatments are more expensive than the 2,4-D treatment 

 but are safer to use near crops extrennely sensitive to 2,4-D, such as cotton, 

 grapes, and tomatoes. Reasonable care should be used, however, to prevent 

 herbicide treatments from drifting to crop plants. 



(2) For control of water lilies, lotus, spatterdock, arrowhead, pickerel- 

 weed, spikerush, and smartweed: 2,4-D at l/2 to 2 pounds per 100 gallons 

 of diesel oil in sufficient volume to thoroughly cover foliage. 



48 



