By Dewayne Torgeson

Agricultural and commercial purposes Environmental Interactions

summary: Agricultural and commercial functions Environmental Interactions

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A. (1939). Plant injection as a physiological method. Ann. ] 3,155-226. Robertson, J. (1821). On the mildew and some other diseases incident to fruit trees. Trans. Hort. Soc. London 5, 175-185. Rumbold, C. (1915). Methods of injecting trees. Phytopathology 5, 225-229. Sanders, G. , and Kelsall, A. (1918). A copper dust. Proc. Entomol. Soc. Nova Scotia 4, 32-37. Sanford, G. B. (1926). Some factors affecting the pathogenicity of Actinomyces scabies. Phytopathology 16, 525-547. Sanford, G. B. (1959).

This removes much potentially diseased material and can also remove the seeds of parasitic plants, such as dodder (of clover) and witchweed of corn. (2) Chemical treatment of the seed to kill spores on the seed, or to protect the seed in the soil from pathogenic fungi. These are the common bunts, smuts, and foot rots. , copper, sulfur, organomercurials (by far the most used group) and miscellaneous organic chemicals, such as thiram (tetramethylthiuramdisulfide). (3) There are certain smuts such as loose smut of wheat (Ustilago tritici), and loose smut of barley (Ustilago nuda) which cannot be con­ trolled by seed dressings because the mycelium of the fungus is within the seed itself.

E. H . (1961). "Pesticide Index," 193 pp. Coll. Sei. PubL, State College, Pennsylvania. Frear, D . E . , comp. (1965). "Pesticide Handbook—Entoma," 18th ed. 312 pp. Coll. Sei. , State College, Pennsylvania. "Fungicide—Nematocide Tests. " (1966). Vol. 22, 124 pp. Am. Phytopathol. S o c , Fruit Res. , Arendtsville, Pennsylvania. Gaddum, J. H . (1933). Reports on biological standards. I I I . Methods of biological assay depending on a quantal response. Med. Res. Council, Spec. Rept. Ser, 183, 1-46.

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