ALLIGATORWEED 19 



During the past few years, several new chemicals have been 

 tested on alligatorweed at waterfowl refuges in the Southeast, and 

 cooperative studies by the State of North Carolina and the U. S. Fish 

 and Wildlife Service have tried numerous new compounds, both 

 alone and in various mixtures, on more than 100 experimental 

 plots in that State. Some of the more promising treatments are 

 indicated below under subheadings that denote the type of site. 



IN FLOODED SITES 



Treatments with the Weedone 2,4, 5-T Propionic form of silvex 

 at 40 pounds acid equivalent and neburon at 32 active per acre 

 have given good results. Mixtures of chemicals also have been 

 encouraging in some instances, the combinations proving to be 

 more effective than twice the amount of either component used 

 separately. Following are some of the more promising mixtures 

 with indication of poundage per acre of acid equivalent or active 

 ingredients: neburon at 16 with the Kuron form of silvex at 20; 

 TBA mixture at 6 with silvex at 20; dalapon at 33 with silvex 

 at 20. 



IN UNFLOODED OR TEMPORARILY DRAINED SITES 



Erbon has given effective control in North Carolina and else- 

 where with dosages of 40 pounds active per acre, and in some cases 

 as low as 20 pounds active, providing flooding does not occur for 

 2 months after treatment. Best results were obtained by treating 

 during the period of active growth. The sterilant effect of erbon 

 at these dosages disappears largely or entirely within 3 months. 



ATA at 10 pounds applied at different stations during maximum 

 flowering has given inconsistent results. At 2 or 3 tons per acre, 

 Polybor-chlorate, Borascu, or sodium chlorate are capable of elimi- 

 nating alligatorweed in moist or comparatively dry places. 



REFERENCES 



1956. Portrait of a Killer. Jack Dermid. Wildlife in North Carolina. 20 (5). 

 1953. The use of 2,4-D in the Control of Water Hyacinth and Alligator Weed in the 



Mississippi Delta, with Certain Ecological ImpHcations. Willis A. Eggler. 



Ecology, 34 (2). 

 1952. Engineer Uses of Chemical Herbicides. Walter A. Carey. The Military 



Engineer, 44 (299). 

 1950. Growth and Reproduction of Water Hyacinth and Alligator Weed and Their 



Control by Means of 2,4-D. A. E. Hitchcock, P. W. Zimmerman, Henry 



Kirkpatrick, Jr., and T. T. Earle. Contrib. Boyce Thompson Inst., 16 (3). 

 1940. The Biology of Achyranthes philoxeroides (Mart.) Standley. William T. 



Penfound. American Midi. Nat., 24 (1). 



