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A History of Weed Control in the United States and Canada

  • F. L. Timmons


Available literature indicates that relatively few agricultural leaders and farmers became interested in weeds as a problem before 1200 A.D. or even 1500 A.D. For many centuries, weed control was mostly incidental to tillage for seedbed preparation and growing of crops and to growing and cutting or pasturing of thickly planted crops. Occasional references in literature previous to 1900 mentioned use of mechanical devices and a few inorganic herbicides specifically for weed control.

State weed laws directed at control of plant diseases were enacted during 1721 to 1766, but weed and seed laws involving weeds directly were not enacted until 100 to 200 years later. Only a few extension type publications on weeds were issued in the United States and Canada between 1860 and 1900. There was a rapid increase in such publications after 1900. Research with inorganic chemicals as herbicides was begun in the 1890's in Europe and in a few states and provinces, and was increased at a rapid pace until the early 1940's. New developments in mechanical and biological control of weeds increased steadily during the same period. However, weed control remained a relatively minor phase of agronomy, botany, horticulture, agricultural engineering, and plant physiology until the early 1950's.

About 10 years after the discovery of (2,4-dichlorophenoxy)acetic acid (2,4-D) in 1942–1944, the much increased interest of scientists, federal and state governments, industrial companies, and the general public had begun to bear fruit. The word “weed” or “weeds” began to appear in the titles of college courses and extension specialists. Weed conferences had been organized in six regions of the United States and Canada and in 10 states.

The first meeting of the Weed Science Society of America was held in 1956 and Weed Science was adopted as its official journal. The number of herbicides in general use in the United States and Canada increased from 15 in 1940 to 25 in 1950, and to 100 in 1969. The total support for weed research in 1962 in the United States was six times that in 1950. The number of full-time research and extension workers or their equivalents in part-time workers had increased 20-fold and 13-fold, respectively, over the number in 1940.

The rate of advancement in the art and science of weed control has increased so rapidly that the progress in each of the recent brief periods 1941 to 1968, 1901 to 1940, and 1800 to 1900 is considered greater than that in all previous periods, beginning about 6000 B.C.



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1. Adams, G. E. 1909. Weeds, their eradication and control. Rhode Island Agr. Exp. Sta. Bull. 133:61.
2. Aldous, R. E. 1930. Relation of organic food reserves to growth of some Kansas plants. J. Amer. Soc. Agron. 22:385392. 37 Kennedy, President John F. 1963. Statement in address at Laramie, Wyoming, September 25, 1963.
3. Allard, R. W., Ennis, W. B. Jr., Derose, H. R., and Weaver, R. J. 1946. The action of isopropyl phenyl carbamate upon plants. Bot. Gaz. 107:589596.
4. Arber, Agnes. 1920. Water Plants. Hafner Publishing Co., New York. 436 p.
5. Arle, H. F. and Hamilton, K. C. 1957. Chemical control of weeds in cotton. Arizona Agr. Exp. Sta. Bull. 283. 8 p.
6. Arny, A. C. 1932. Variations in the organic reserves in underground parts of five perennial weeds from late April to November. Minnesota Agr. Exp. Sta. Tech. Bull. 84. 28 p.
7. Arthur, J. C. 1894. Wild or prickly lettuce. Purdue Univ. Exp. Sta. Bull. 52:81114.
8. Aslander, Alfred. 1926. Chlorates as plant poisons. J. Amer. Soc. Agron. 18:11011102.
9. Aslander, Alfred. 1927. Sulfuric acid as a weed spray. J. Agr. Res. 34:10651091.
10. Aslander, Alfred. 1928. Experiments on eradication of Canada thistle with chlorates and other herbicides. J. Agr. Res. 36:915934.
11. Bakke, A. L., Gaessler, W. G., and Loomis, W. E. 1939. Relation of root reserves to control of European bindweed (Convolvulus arvensis). Iowa Agr. Exp. Sta. Res. Bull. 254:113144.
12. Ball, Carlton. 1901. Johnson Grass: Report of investigations during the season of 1901. U. S. Dep. Agr. Bur. Plant Ind. Bull. 11. 24 p.
13. Ball, W. E. and French, O. C. 1935. Sulfuric acid for control of weeds. California Agr. Exp. Sta. Bull. 596. 29 p.
14. Barr, Harold. 1947. Flame cultivation. Louisiana Agr. Exp. Sta. Bull. 415. 15 p.
15. Barrons, Keith C. and Grigsby, Buford H. 1946. The control of weeds in canning peas. Michigan Agr. Exp. Sta. Quart. Bull. 28:145156.
16. Becker, C. F. and Costel, G. L. 1958. Equipment for the application of granular herbicides. Wyoming Agr. Exp. Sta. Mimeo Circ. 102. 18 p.
17. Bennett, F. D. 1966. Investigations on insects attacking the aquatic ferns (Salvinia spp.) in Trinidad and northern South America. Proc. So. Weed Conf. 19:497504.
18. Bioletti, Frederick T. 1911. The extermination of wild morning glory. California Agr. Exp. Sta. Circ. 69. 12 p.
19. Blackburn, Robert D. and Andres, L. A. 1968. The snail, the mermaid and the flea beetle. U. S. Dep. Agr. Yearbook of Agr., p. 229234. Gov't Printing Off., Washington, D. C.
20. Blackman, G. E. 1948. Recent developments in the control of weeds. J. Royal Hort. Sci. 73:134144.
21. Bolley, H. L. 1901. Studies upon weeds in 1900. North Dakota Agr. Exp. Sta. Annu. Rep. 11:4856.
22. Bolley, H. L. 1908. Weeds and methods of eradication. Weed control by means of chemical sprays. North Dakota Agr. Exp. Sta. Bull. 80:511574.
23. Bondarenko, D. D. and Dowler, C. D. 1958. Herbicides in soybeans. Proc. No. Cent. Weed Contr. Conf. 15:109110.
24. Boyd, George W. and Corkins, C. L. 1941. Control of noxious weeds by burning and how to make a burner. Wyoming Agr. Ext. Serv. Circ. 75. 16 p.
25. Brown, E. O. and Porter, R. H. 1942. Viability and germination of seeds of Convolvulus arvensis L. and other perennial weeds. Iowa Agr. Exp. Sta. Res. Bull. 294:473504.
26. Bruns, V. F. 1965. The effects of fresh water storage on the germination of certain weed seeds. Weeds 13:3840.
27. Bruns, V. F. and Rasmussen, L. W. 1953. The effects of freshwater storage on the germination of certain weed seeds. Part I. White top, Russian knapweed, Canada thistle, morning glory, and poverty weed. Weeds 2:138147.
28. Bruns, V. F., Hodgson, J. M., Arle, H. F., and Timmons, F. L. 1955. The use of aromatic solvents for control of submersed aquatic weeds in irrigation channels. U. S. Dep. Agr. Circ. 971. 33 p.
29. Bucha, H. C. and Todd, C. W. 1951. 3-(p-chlorophenyl)-1,1-dimethylurea, a new herbicide. Science 114:493494.
30. CALIFORNIA DEPARTMENT OF AGRICULTURE. 1922. Weeds of California and methods of control. California Dep. Agr. Monthly Bull., Vol. IX, Nos. 2–3. 360 p.
31. Call, L. E. and Getty, R. E. 1923. The eradication of bindweed. Kansas Agr. Exp. Sta. Circ. 101. 18 p.
32. Cameron, E. 1935. A study of the natural control of ragwort (Senecio jacobaea L.). J. Ecol. 23:265322.
33. Cates, J. S. 1911. Eradication of quackgrass. U. S. Dep. Agr. Farmers Bull. 464. 11 p.
34. Cates, J. S. and Cox, H. R. 1912. The weed factor in the cultivation of corn. U. S. Dep. Agr. Bur. Plant Ind. Bull. 257. 35 p.
35. Chater, E. H. 1931. A contribution to the natural control of gorse. Bull. Entomol. Res. 22:225235.
36. Chepil, W. S. 1946. Germination of weed seeds, longevity, periodicity of germination and vitality of seeds in cultivated soil. Sci. Agr. 26:307346.
37. Chimits, Pierre. 1955. Tilapia and its culture. Food and Agr. Org. Fisheries Bull. VIII(2):133.
38. Clark, G. H. and Fletcher, James. 1906. Farm weeds of Canada. Canada Dep. Agr. Seed Branch, Ottawa. 103 p.
39. Clark, George H. and Fletcher, James. 1909. Farm weeds of Canada. 2nd Ed. Government Printing Bur., Ottawa. 192 p.
40. Corkins, C. L. and Elledge, A. B. 1940. Continuous burning to eradicate noxious weeds. The Reclam. Era 30:140142.
41. Cox, H. R. 1909. Eradication of bindweed or morning glory. U. S. Dep. Agr. Farmers Bull. 368. 19 p.
42. Crafts, A. S. 1935. Factors affecting the effectiveness of sodium chlorate as an herbicide. Hilgardia 9:437457.
43. Crafts, A. S. 1945. A new herbicide, 2,4-dinitro-6-secondary butyl phenol. Science 101:417418.
44. Crafts, A. S. and Kennedy, P. B. 1930. The physiology of Convolvulus arvensis in relation to its control by chemical sprays. Plant Physiol. 5:329344.
45. Crafts, A. S. and Harvey, W. A. 1949. Weed control. Advances in Agron. 1:289320.
46. Crafts, A. S. and Raynor, R. N. 1936. The herbicidal properties of boron compounds. Hilgardia 10:343374.
47. Coulter, L. L. 1954. Silvex, a new selective herbicide. Down to Earth (Spring). p. 1820.
48. Currie, G. A. and Fyfe, R. V. 1938. Fate of certain European insects introduced into Australia. Australia Council Sci. and Ind. Res. J. 11:289301.
49. Dana, Malcolm N., Skroch, Walter, and Boone, Donald M. 1965. Granular herbicides for cranberry bogs. Weeds 13:57.
50. Darlington, H. T. 1951. The seventy-year period of Dr. Beal's seed viability experiment. Amer. J. Bot. 38:379381.
51. Darrow, Robert A., McCully, Wayne G., and Hughes, Eugene E. 1959. Woody plant and grass responses to fenuron and chlorinated benzoic acids. Proc. No. Cent. Weed Contr. Conf. 12:143147.
52. Davidson, Harold and Reis, S. K. 1962. Weed control studies with nursery crops. Michigan Agr. Exp. Sta. Quar. Bull. 44:751758.
53. Derose, H. R. 1951. Crabgrass inhibition with O-isopropyl N-(3-chlorophenyl) carbamate. Agron. J. 43:139142.
54. Dewey, Lester H. 1895. Weeds and how to kill them. U. S. Dep. Agr. Farmers Bull. 28. 31 p.
55. Dodd, A. P. 1927. The biological control of prickly pear in Australia. Australia Council Sci. and Ind. Res. Bull. 34. 44 p.
56. Dodds, D. R. 1920. Garlic and wild onions. West Virginia Agr. Exp. Sta. Circ. 253. 4 p.
57. Domagalla, B. P. 1926. Treatment of algae and weeds in lakes at Madison, Wisconsin. Eng. News-Record 97:950954.
58. DOW CHEMICAL COMPANY. 1950. TCA, its range of usefulness. Down to Earth (Summer). p. 810.
59. Duvel, J. W. T. 1905. The viability of buried seed. U. S. Dep. Agr. Bur. Plant Ind. Bull. 83. 22 p.
60. Eaton, A. J. and Edson, H. A. 1910. Practical method of killing witch grass (quackgrass). Vermont Agr. Exp. Sta. Bull. 149:417447.
61. Edwards, F. E. 1964. History and progress of flame cultivation. Proc. Annu. Symp., Research on Flame Weed Contr. 1:36.
62. Fletcher, James. 1897. The worst Canadian weeds. Canada Dep. Agr. Bull. 28. 39 p.
63. Franzke, C. J. and Hume, A. N. 1936. Field bindweed. South Dakota Agr. Exp. Sta. Bull. 305. 51 p.
64. Frazier, John C. 1943. Nature and rate of development of the root system of Convolvulus arvensis. Bot. Gaz. 104:417425.
65. Frazier, John C. 1948. Principal noxious perennial weeds of Kansas with emphasis in relation to control. Kansas Agr. Exp. Sta. Bull. 331. 45 p.
66. Freed, Virgil H. and Bierman, H. E. 1950. IPC, a new weed killer. Oregon Agr. Exp. Sta. Bull. 483. 8 p.
67. Fulling, Edmund H. 1943. Plant life and the law of man. IV. Barberry, currant, gooseberry, and cedar control. Bot. Rev. 9:483592.
68. Gadd, Pehr Adrian. 1777. Weeds in our Swedish fields and how they can be best eradicated, Chap. 14, p. 162187. In Systematic Introduction on Swedish Land Husbandry. Vol. III. Swedish Acad. Sci., Stockholm.
69. Gaetner, Erika E. 1950. Studies of seed germination, seed identification and host relationships on dodders. Cornell Univ. Agr. Exp. Sta. Memoir 294. 56 p.
70. Georgia, Ada E. 1927. Manual of Weeds. Macmillan Co., N. Y. 593 p.
71. Gittins, Bert S. 1959. Land of plenty. 2nd Ed. Farm Equipment Inst., Chicago, Il. 63 p.
72. Goss, W. L. 1924. The vitality of buried seed. J. Agr. Res. 29:349362.
73. Grandfield, C. O. 1930. The relation of organic food reserves to the effect of cutting pasture weeds at different stages of growth. J. Amer. Soc. Agron. 22:709713.
74. Gray, G. P. 1917. Spraying for the control of wild morning glory in the fog belt. California Agr. Exp. Sta. Circ. 168. 8 p.
75. Grigsby, B. H. 1946. Oil sprays for the control of weeds in carrots and related crops. Michigan Agr. Exp. Sta. Quart. Bull. 28:201207.
76. Grigsby, B. H. and Barrons, K. C. 1945. Some new ideas in weed control. Michigan Agr. Exp. Sta. Quart. Bull. 27:301309.
77. Groh, Herbert. 1922. A survey of weed control and investigation in Canada. Sci. Agr. 3:415420.
78. Gysin, H. 1960. The role of chemical research in developing selective weed control practices. Weeds 8:541555.
79. Halsted, D. Byron. 1889. What are the worst weeds in New Jersey. New Jersey Agr. Exp. Sta. Bull. 52. 15 p.
80. Hamilton, Robert H. and Aldrich, Richard J. 1952. The use of certain esters of trichlorobenzoic acids for preemergence weed control. Proc. No. East. Weed Contr. Conf. 19:6573.
81. Hamner, C. L. and Tukey, H. B. 1944. Herbicidal action of 2,4-dichlorophenoxyacetic acid and trichlorophenoxyacetic acid on bindweed. Science 100:154155.
82. Hannesson, H. A., Raynor, R. N., and Crafts, A. S. 1945. Herbicidal use of carbon disulfide. California Agr. Exp. Sta. Bull. 693. 57 p.
83. Hanson, Noel S. 1962. Weed control practices and research for sugarcane in Hawaii. Weeds 10:192200.
84. Hanson, N. S., Keim, F. D., and Goss, D. L. 1943. Bindweed eradication in Nebraska. Nebraska Agr. Exp. Sta. Circ. 50. 24 p.
85. Harmon, George W. and Keim, F. D. 1934. The percentage and viability of weed seeds recovered in the feces of farm animals and their longevity when buried in manure. J. Amer. Soc. Agron. 26:762767.
86. Harris, L. E. and Hyslop, J. R. 1942. Selective sprays for weed control in crops. Oregon Agr. Exp. Sta. Bull. 403. 31 p.
87. Harrison, F. C. 1900. Some common Ontario weeds. Ontario Agr. and Experimental Union Bull. 128. 96 p.
88. Helgeson, E. A. and Gebracht, D. 1940. Chemical control of annual weeds in flax and grain fields. North Dakota Agr. Exp. Sta. Bimonthly Bull. 3:710.
89. Henderson, L. F. 1898. Twelve of Idaho's worst weeds. Idaho Exp. Sta. Bull. 14:89136.
90. Hildebrand, E. M. 1946. War on weeds. Science 103:465468, 492.
91. Hildebrand, E. M. and Palmiter, D. H. 1942. Ammonium sulfamate for weed control. Proc. New York Hort. Soc. 87:3440.
92. Hill, G. D., McGahen, J. W., Baker, H. M., Finnerty, D. W., and Bingeman, C. W. 1955. The fate of substituted urea herbicides in agricultural soils. Agron. J. 47:93103.
93. Hirsch, A. A. 1942. Toxic effects of sodium pentachlorophenate and other chemicals on water hyacinth. Bot. Gaz. 103:620621.
94. Hitchcock, A. S. and Norton, J. B. S. 1895–1896. Reports on Kansas weeds: The seedlings. Kansas Agr. Exp. Sta. Bull. 50:2054; Preliminary circular on distribution. Bull. 52:87101. Descriptive list and distribution. Bull. 57:164.
95. Hodgson, J. M. 1950. Electrovation found ineffective on perennial weeds. What's New in Crops and Soils 3(3):25.
96. Holloway, J. K. 1964. Projects in biological control of weeds, p. 650670. In Debach, P. and Schlinger, E. I., Biological Control of Insect Pests and Weeds. Reinhold Pub. Corp., New York.
97. Holloway, James K. and Huffaker, C. B. 1952. Insects to control weeds. Yearbook of Agr. Separate 2305. p. 135140.
98. Holstun, J. T. and McWhorter, C. G. 1963. Relation of structure to phytotoxicity of s-triazine herbicides on cotton and weeds. Agr. and Food Chem. 11:441443.
99. Howitt, J. E. 1911. Weeds in Ontario. Ontario Agr. Coll. Bull. 188. 144 p.
100. Hulbert, H. W., Remsberg, J. D., and Spence, H. L. 1930. Controlling perennial weeds with chlorates. J. Amer. Soc. Agron. 22:423433.
101. Hulbert, H. W. and Benjamin, L. V. 1935. Dry applications of chlorates. Idaho Exp. Sta. Circ. 74. 8 p.
102. Jones, L. R. and Orton, W. G. 1896. The orange hawkweed or “paint-brush.” Vermont Agr. Exp. Sta. Bull. 56. 15 p.
103. Kephart, L. W. 1948. Remarks accepting honorary membership. Proc. No. Centro Weed Control Conf. 5:181183.
104. Kephart, L. W. 1949. Future needs in weed control research. Proc. West. Weed Contr. Conf. 11:3032.
105. Kiesselbach, T. A., Petersen, N. F., and Burr, W. W. 1934. Bindweeds and their control. Nebraska Agr. Exp. Sta. Bull. 287. 47 p.
106. King, Lawrence J., Lambrech, J. A., and Finn, Thomas P. 1950. Herbicidal properties of sodium 2,4-dichlorophenoxyethyl sulfate. Contrib. Boyce Thompson Inst. 16:191208.
107. Latshaw, W. L. and Zahnley, J. W. 1927. Experiments with sodium chlorate and other chemicals as herbicides for field bindweed. J. Agr. Res. 35:757767.
108. Litzenberger, S. C. 1942. The effectiveness of borax and sodium chlorate-borax combinations for the control of perennial weeds. Montana Agr. Exp. Sta. War Circ. 2. 11 p.
109. Litzenberger, S. C. and Post, A. H. 1943. Selective sprays for control of weeds in Kentucky bluegrass lawns. Montana Agr. Exp. Sta. Bull. 411. 23 p.
110. Litzenberger, S. C., Post, A. H., and Bingham, G. H. 1945. Controlling broadleaved annual and biennial weeds with sinox. Montana Agr. Exp. Sta. Bull. 430. 18 p.
111. Loomis, W. E. 1938. The control of dandelions in lawns. J. Agr. Res. 56:855868.
112. Loomis, W. E., Bissey, Russell, and Smith, E. V. 1931. Chlorates as herbicides. Science 74:485.
113. Loomis, W. E. and Noecker, N. L. 1936. Petroleum sprays for dandelions. Science 83:6364.
114. Loyer, . 1923. Emploi des chlorates pour la destruction des herbes dans les cereales de printemps. Compt. Rend. Acad. Agr. France 9:957960.
115. Lute, Anna M., Brown, Edgar, Holms, F. S., Serrine, Emma F., Stone, A. L., and Wright, W. H. 1942. History of the association of seed analysts. Edwards Bros. Inc., Litho Printers, Ann Arbor, Mich. 51 p.
116. Mackenthun, Kenneth M. 1952. Cleaner lakes can be a reality. Wisconsin Conserv. Bull. 17:14.
117. McCall, G. L. and Zahnley, J. W. 1949. Control of noxious perennial grasses with the trichloroacetates. Kansas Agr. Exp. Sta. Circ. 255. 8 p.
118. McCleod, J. H., McGugan, B. M., and Coppel, H. C. 1962. A review of the biological control attempts against insects and weeds in Canada. Commonwealth Agricultural Bureaux, Tech. Comm. No. 2. Central Sales, Farnham Royal, Bucks, England. 216 p.
119. McWhorter, C. J. 1966. Sesbania control in soybeans with 2,4-D wax bars. Weeds 14:152155.
120. Miller, D. 1936. Biological control of noxious weeds. New Zealand J. Sci. and Technol. 18:581584.
121. Millspaugh, C. F. 1890. The Canada thistle. West Virginia Agr. Exp. Sta. Bull. 12:268274.
122. Millspaugh, C. F. 1892. Descriptive list of weeds of West Virginia. West Virginia Agr. Exp. Sta. Bull. 22:178214.
123. Mitchell, J. W. and Hamner, C. L. 1944. Polyethyleneglycols as carriers for growth regulating substances. Bot. Gaz. 105:474483.
124. Moran, W. T. and Shaw, J. M. 1948. A new killer for waterweeds. U. S. Bur. Reclam. Era 34:8183, 93.
125. Moore, G. T. and Kellerman, K. F. 1905. Copper as an algacide and disinfectant in water supplies. U. S. Dep. Agr. Bur. Plant Ind. Bull. 76. 55 p.
126. Moore, Donald H., George, Donald K., Vaughn, Martin O., and Garman, John A. 1953. Evaluation of three carbamate herbicides in comparison with isopropyl N-(3-chlorophenyl) carbamate. Agr. and Food Chem. 1(19):153158.
127. Muenscher, W. C. 1932. Killing perennial weeds with chlorates during winter. Cornell Agr. Exp. Sta. Bull. 542. 8 p.
128. Mukula, J. and Ruuttunen, E. 1969. Chemical weed control in Finland 1887–1965. Ann. Finnish Agr., J. Agr. Res. Centre Vol. 8, Suppl. 1. 45 p.
129. National Agricultural Chemicals Association. 1958. Open door to plenty. NACA, Washington, D. C. 64 p.
130. Natural Gas Processors Association. 1964. Research on flame weed control, Technical papers. Proc. 1st Annu. Symp. 38 p.
131. Neely, Wirston J. and Brain, Sidney G. 1944. Control of weeds and grass in cotton by flaming. Mississippi Agr. Exp. Sta. Circ. 118. 6 p.
132. Olive, E. W. 1909. The killing of mustard by use of iron sulfate. South Dakota Agr. Exp. Sta. Bull. 112:485498.
133. Osborne, O. M. 1911. Weed pests of Idaho and methods of eradication. Idaho Agr. Exp. Sta. Bull. 71. 36 p.
134. Oswald, E. I. 1908. The effect of animal digestion and fermentation of manure on the viability of weeds. Maryland Agr. Exp. Sta. Bull. 128:265291.
135. Palmer, C. V. 1959. Algae in water supplies. U. S. Public Health Serv. Pub. 657. 88 p.
136. Pammel, L. H. 1915. Weeds of farm and garden. Orange Judd Co., N. Y. 281 p.
137. Pammel, L. H. and King, C. M. 1909. Notes on eradication of weeds with experiments made in 1907–08. Iowa Agr. Exp. Sta. Bull. 105:265300.
138. Panton, J. H. 1887. Weeds. Ontario Agr. Coll. Bull. 10. 3 p.
139. Pavlychenko, T. K. and Harrington, H. B. 1934. Competitive efficiency of weeds and cereal crops. Canada J. Res. 10:7794.
140. Peitersen, A. K. and Burdick, R. T. 1920. Perennial peppergrass in Colorado. Colorado Agr. Exp. Sta. Bull. 264. 10 p.
141. Perkins, R. C. L., Swezey, O. H., and Koebele, A. 1924. The introduction into Hawaii of insects that attack lantana. Hawaiian Sugar Planters Assoc. Exp. Sta. Entomol. Serv. Bull. 16. 83 p.
142. Peterson, Gale E. 1967. The discovery and development of 2,4-D. Agr. Histor. 41:243253.
143. Pettey, F. W. 1948. The biological control of prickly pears in South Africa. South Africa Dep. Agr. Sci. Bull. 271. 163 p.
144. Pipal, F. J. 1914. Wild garlic and its eradication. Purdue Agr. Exp. Sta. Bull. 175. 43 p.
145. Piper, C. V. 1893. Common fungous diseases and methods of prevention-dodder. Washington Agr. Exp. Sta. Bull. 8:131144.
146. Piper, C. V. 1898. The Russian thistle in Washington. Washington Agr. Exp. Sta. Bull. 34. 18 p.
147. Phybus, Mary B., Wain, R. L., and Wightman, F. 1958. New plant growth substances with selective herbicidal activity. Nature 182:1094, 1095.
148. Raynor, R. N. 1937. The chemical control of St. Johnswort. California Agr. Exp. Sta. Bull. 615. 38 p.
149. Rich, F. A. and Jones, L. R. 1902. A poisonous plant, the common horsetail. Vermont Agr. Exp. Sta. Bull. 95. 8 p.
150. Robbins, W. W., Crafts, A. S., and Raynor, R. N. 1942. Weed control. McGraw-Hill Book Co., Inc., New York and London. 543 p.
151. Rose, J. N. 1891. Two new weeds in the U. S. Broomrape (Orobanchi ramosa) and saltwort (Salsoli kali). U. S. Dep. Agr. Annu. Rep. p. 355358.
152. Schultz, E. R. and Thompson, Noel F. 1926. Some effects of sodium arsenite when used to kill common barberry. U. S. Dep. Agr. Dep. Bull. 1316. 18 p.
153. Schinendiman, A., Torrie, J. H., and Briggs, G. M. 1943. Effects of sinox, a selective weed spray, on legume seedlings, weeds, and crop yields. J. Amer. Soc. Agron. 35:901908.
154. Scribner, T. Lamson. 1869. Weeds of Maine. Sprague, Owen, and Nash. 62 p. Ref. U. S. Dep. Agr. Annu. Rep. 1869:503–504.
155. Sculthorpe, C. D. 1967. The Biology of Aquatic Vascular Plants. St. Martin's Press, New York. 610 p.
156. Seaman, D. E. and Porterfield, W. A. 1964. Control of aquatic weeds by the snail Marisa cornuarietis . Weeds 12:8792.
157. Seeley, C. I. 1952. Controlling perennial weeds with tillage. Idaho Agr. Exp. Sta. Bull. 288. 43 p.
158. Selby, A. D. and Van atta, D. R. 1916. Kill garlic and wild onions by oil spraying. Ohio Agr. Exp. Sta. Monthly Bull. 1(12):355359.
159. Shafer, E. G., Lee, O. C., and Miller, J. R. 1929. Eradicating the bindweed with sodium chlorate. Washington Agr. Exp. Sta. Bull. 235. 16 p.
160. Shaw, W. C. and Swanson, C. R. 1953. The relation of structural configuration to the herbicidal properties and phytotoxicity of several carbamates and other chemicals. Weeds II:4365.
161. Shaw, W. C. and Loustalot, A. J. 1963. Revolution in weed science. Reprint from Agr. Sci. Review, U. S. Dep. Agr. Coop. State Res. Serv. Quart. Pub. Fall. 10 p.
162. Southwick, Lawrence. 1954. Dow dalapon a new formulation now available to research workers. Down to Earth (Spring). p. 7, 8.
163. Spence, H. L. Jr., 1937. Eradicating perennial weeds with carbon bisulphide. Univ. of Idaho Ext. Bull. 106. 10 p.
164. Stewart, George and Pittman, D. W. 1924. Ridding the land of wild morning glory. Utah Agr. Exp. Sta. Bull. 189. 30 p.
165. Surber, E. W. 1949. Control of aquatic plants in ponds and lakes. U. S. Fish and Wildlife Serv. Fisheries Leafl. 344. 20 p.
166. Talley, P. J. 1960. Tentative recommendations for weed control in cotton. Mississippi Agr. Exp. Sta. Bull. 471. 16 p.
167. Thornton, B. J. and Durrell, L. W. 1933. Colorado weeds. Colorado Agr. Exp. Sta. Bull. 403. 115 p.
168. Timmons, F. L. 1938. Methods of eradicating bindweed. Fort Hays Branch, Kansas Agr. Exp. Sta. Contrib. No. 24. 13 p.
169. Timmons, F. L. 1941. Results of bindweed control experiments at the Fort Hays Branch Station, Hays, Kansas, 1935 to 1940. Kansas Agr. Exp. Sta. Bull. 296. 50 p.
170. Timmons, F. L. 1942. The dissemination of prickly pear seed by jack rabbits. J. Amer. Soc. Agron. 34:513520.
171. Timmons, F. L. 1942. The rise and decline of cactus in Kansas. Kansas State Board Agr. Bien. Rep. 33:3746.
172. Timmons, F. L. 1949. Duration of viability of bindweed seeds under field conditions and experimental results in the control of bindweed seedlings. Agron. J. 41:130133.
173. Todd, S. Edwards. 1866. Improved farm implements. Allen's new weeding hoe. U. S. Dep. Agr. Annu. Rep. p. 285.
174. U. S. Department of Agriculture. 1860. Weeds, composition, means of spreading, means of destroying. U. S. Dep. Agr. Annu. Rep. p. 63, 133–134.
175. U.S. DEPARTMENT OF AGRICULTURE, AGRICULTURAL RESEARCH SERVICE, and U. S. DEPARTMENT OF INTERIOR, BUREAU OF RECLAMATION JOINT REPORT. 1963. Chemical control of submersed waterweeds in western irrigation and drainage canals. U. S. Dep. Agr. ARS 34–57. 14 p.
176. U.S. DEPARTMENT OF INTERIOR, BUREAU OF RECLAMATION. 1949. Control of weeds on irrigation systems. Rev. Government Printing Off., Washington. D. C. 140 p.
177. Vasey, George C. 1886. Weeds of agriculture. U. S. Dep. Agr. Annu. Rep. p. 8493.
178. VERMONT AGRICULTURAL EXPERIMENT STATION. 1907. Vermont weeds. Vermont Agr. Exp. Sta. Annu. Rep. 20:417422.
179. VERMONT AGRICULTURAL EXPERIMENT STATION. 1909. Vermont's worst weeds compared in periodic surveys 1872, 1891, 1898, and 1909. Vermont Agr. Exp. Sta. Bull. 46:237240.
180. Wain, R. L. 1955. A new approach to selective weed control. Ann. Appl. Biol. 42:151157.
181. Wain, R. L. 1963. 3:5-dihalogeno-4-hydroxy benzonitriles: New herbicides with molluscocidal activity. Nature 200:28.
182. Waldron, C. B. 1892. Troublesome members of the mustard family. North Dakota Agr. Exp. Sta. Bull. 6. 19 p.
183. Waldron, L. R. 1903. Noxious weeds and how to kill them. North Dakota Agr. Exp. Sta. Bull. 56:198244.
184. Walker, Ernest. 1906. Suggestions upon the care of apple orchards. Arkansas Agr. Exp. Sta. Press Bull. 25:14.
185. Wells, H. G. 1961. The Outline of History. Sixth ed. Garden City Books, Garden City, N. Y. p. 128, 132, 183.
186. Welton, F. A. 1929. Sodium chlorate as a lawn weed killer. Ohio Agr. Exp. Sta. Bimonthly Bull. 141:188190.
187. Westgate, W. A. and Raynor, R. N. 1940. New selective spray for control of certain weeds. California Agr. Exp. Sta. Bull. 634. 36 p.
188. White, K. D. 1967. Agricultural Implements in the Roman World. Cambridge Univ. Press, London. 232 p.
189. Wiese, A. F. and Rea, H. E. 1961. Control of field bindweed and other perennial weeds with benzoic and phenylacetic acids. Weeds 9:423428.
190. Wilcox, E. W. 1909. Carbon bisulphide for killing weeds. Hawaii Agr. Exp. Sta. Press Bull. 25:14.
191. Willard, C. J. 1930. Killing field weeds with chlorates. Ohio Agr. Exp. Sta. Bimonthly Bull. 146:155168.
192. Willard, C. J. 1950. TCA, a new quackgrass killer. Ohio Farm and Home Res. March–April. p. 24, 25.
193. Willard, C. J. 1954. Weed control: Past, present, prospects. Agron. J. 46:481484.
194. Williams, F. X. 1922. Notes on some enemies of nutgrass in the Philippines. Hawaiian Planters Rec. 26:9597.
195. Wilson, H. K., Stahler, L. M., Arny, A. C., Harvey, R. B., Larson, A. H., and Landon, R. H. 1942. Battling weeds on Minnesota farms. Minnesota Agr. Exp. Sta. Bull. 363. 28 p.
196. Wood, H. E. 1959. A brief history of weeds and their control in Manitoba. Manitoba Dep. Agr. and Immigr. Pub. 307. 18 p.
197. Woods, Chas. D. and Bartlett, J. M. 1909. Field experiments 1906–1908. Maine Agr. Exp. Sta. Bull. 167:85104.
198. Wooten, O. B. and McWhorter, C. G. 1961. A device for subsurface application of herbicides. Weeds 9:3641.
199. Yeo, R. R. 1967. Silver dollar fish for biological control of submersed aquatic weeds. Weeds 15:2731.
200. Yost, T. F. 1939. Homemade Bindweed Tools. Kansas State Bd. Agr. Pub. Kansas State Printing Plant, Topeka, Kansas. 39 p.
201. Yost, T. F. 1940. Summary of bindweed situation and progress in 1939. Kansas State Board Agr. Rep. 237. 73 p.
202. Zahnley, J. W. and Fitch, J. B. 1934. Effect of ensiling on the viability of weed seeds. J. Amer. Soc. Agron. 26:816822.
203. Zeiger, C. F. 1967. Biological control of alligatorweed with Agasicles sp. in Florida. Proc. So. Weed Conf. 20:299303.


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