10 HERBICIDAL CONTROL 



of a detergent or "sticker" is needed to assure wetting of water- 

 repellent foliage. Household detergents and Tergitol 4 are suitable 

 for this purpose, but only enough should be used to give good adher- 

 ence. Commonly, the adherence of a spray solution is tested pre- 

 liminarily to appraise adequacy of wetting agents in it. 



SPRAYING EQUIPMENT 



Efficient herbicidal control of marsh weeds requires equipment 

 adapted to the scale or kind of operation involved. For small-, 

 medium-, or large-scale projects, many makes and types of spray- 

 ing equipment are available. For small areas and local "spot treat- 

 ments," single-nozzle hand sprayers are used, either afoot or on 

 boats. Power sprayers mounted on trucks, tractors, or boats are 

 employed commonly on projects of medium or large scale. Usually 

 such spraying outfits have booms with numerous nozzles, but in 

 some instances a single-nozzle hose is attached. For extensive 

 tracts, plane application is practical. This method has, among 

 other merits, the advantage of avoiding difficulties of land or boat 

 travel in soft muck or in areas of interspersed marsh and water. 

 A major part of herbicidal operations on Federal waterfowl refuges 

 now involves airplane spraying. 



Air-thrust boats deserve mention here, though their usefulness 

 is by no means limited to weed-control work. These shallow-draft, 

 flatbottom craft driven by airplane propellers have proved practical 

 in weed-control reconnaissance and for spraying in comparatively 

 inaccessible areas, particularly in marshes that are interlaced with 

 shallow waterways. 



Publications listed below can be consulted for suggestions on 

 spraying equipment: 



1956. Sprayers for Weed Control. William G. Westmoreland and J. C. Ferguson. 



North Carolina State Ext. Circ. 403. 

 1951. Weed Spraying Equipment. G. E. Page. Oregon Agr. Exp. Sta. Bui. 493. 

 1950. When Buying Weed Sprayers Consider Many Points. R. E. Larson and V. H. 



Johnson. Minnesota Farm and Home Sci., 7(2). 

 1948. Chemical Weed-Control Equipment. Norman B. Akesson and W. A. Harvey. 



California Agr. Exp. Sta. Circ. 389. 

 1948. Spray Equipment for Weed Control. Noel S. Hanson and John Steele. Univ. 



Nebraska Ext. Circ. 174. 



JUDGING RESULTS 



Since most marsh weeds are perennials, success or failure of 

 efforts to control them cannot be judged reliably until the following 

 growing season. Furthermore, some herbicides cause inhibition of 



