The effectiveness of formagenic formulations is dependent, in 

 general, upon the 2,4-D acid equivalent in them. Container labels 

 show acid equivalents, and, in making purchases, comparisons should 

 be made between price and per cent of 2,4-D acid equivalent 

 advertised on the label. 



In treating water lilies, cattails, and many other plants, 

 often several pounds of 2,4-D per acre are required for control. 

 Volumes of herbicide range from 50-300 gallons per acre in 

 ground or boat spraying. Lower gallonage, 50 - 100 per acre, is 

 generally required of oil sprays. 



Aerial spraying with 2,4-D is most economical in spraying 

 large areas such as those infested with water hyacinths, requiring 

 only 5-10 gallons of herbicide volume per acre. 



The following table shows amounts of commercial formulations 

 of 2,4-D or volume of solutions per 100 gallons of spray to be 

 used per acre with 1.0 per cent and 0.5 per cent solutions: 



Table 3. --Amounts of commercial 2,4-D formulations 

 to be used per acre 



Percentage 2,4-D 

 acid content of 

 herbicide (from 

 label) 



90 



85 



80 



70 



60 



40 (liquid) 



20 (liquid) 



10 (liquid) 



Amt . of herbicide to 

 give 10,000 p. p.m. 

 per 100 gallons of 

 spray - 1.0% solution 



8 pounds 12 ounces 



9 pounds 6 ounces 



10 pounds 



11 pounds 4 ounces 

 13 pounds 12 ounces 

 2.5 gallons 



5 gallons 

 10 gallons 



Amt. of herbicide to 

 give 5,000 p. p.m. per 

 100 gallons of spray 

 0.570 solution 



4 pounds 6 ounces 



4 pounds 11 ounces 



5 pounds 



5 pounds 15 ounces 



6 pounds 14 ounces 

 5 quarts 



2.5 gallons 

 5 gallons 



Note: This table does not allow for interpolations, 

 for methods of more precise calculations. 



See Appendix B 



One-half per cent solutions of 2,4-D (ester or amine) in 

 water carriers will control arrowheads ( Sagittaria ) , or pickerel 

 weed ( Pontederia ) , smartweed ( Polygonum ) , willows ( Salix ) , and 

 many other marginal plants, that do not have waxy coatings on their 

 leaves, when the plants are well wetted. For small scale treat- 

 ments, 1 pint of 40 per cent 2,4-D in 10 gallons of water will give 

 the desired concentration. The formulation 2,4,5-T is generally 

 regarded as more effective on woody plants than 2,4-D. 



15 



