Chemistry and Mode of Action of Crop Protection Agents by L.G. COPPING
By L.G. COPPING
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And shall eat every tree which groweth for you out of the field. . , . . ’” Not surprisingly, Pharaoh let the people of Israel go!! Today insecticide usage is second only to herbicides in terms of global sales, but in the developing world, insecticides are the largest investment in crop protection chemicals. 3 A very good example of this is the Colorado potato beetle that was naturally occurring in the western United States and became a significant problem as potatoes were introduced. It is now present across the entire country, causing significant damage to the crop.
This mode of action has been shown to be very effective at controlling weeds with rates as low as 1 g ha- leading to plant death for two good reasons. In the first place, there is little substrate competition with the herbicide because the substrate is lost to the cytoplasm when inhibition occurs and, second, because protoporphyrin IX will accumulate even Chapter 2 28 when only a small proportion of the chloroplast protoporphyrinogen oxidase is inhibited. 2 Amino Acid Biosynthesis Animals acquire many of their nutrients in a ready made form from the food that they eat.
5 . , National Academic Press, Washington, DC, 1989. 6. G. D. R. B. Penson, ‘Impacts of Chemical Use Reduction on Crop Yields and Costs’, College Station, Texas, Agricultural and Food Policy Center, Department of Agricultural Economics, Texas A & M University System, 1990. 7. D. E. J. R. A. G. Smith, ‘Pesticides and Safety of Fruits and Vegetables’, Comments from CAST, Ames, Iowa, Council for Agricultural Science and Technology, 1990-91, 1990. 8. F. J. , National Agrochemicals Association, 1989.