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Pesticide Synthesis Handbook Pdf [UPDATED]

This document provides a general overview of human toxicity, provides a listing of laboratory animal and wildlife toxicities and a cross reference of chemical, common and trade names of triazine pesticides registered for use in Florida.

Pesticide Synthesis Handbook Pdf

As a chemical family, the triazines are a group of pesticides with a wide range of uses. Most are used in selective weed control programs; others, such as prometon, have nonselective properties which make them suitable for use on industrial sites. A unique member of this family is cyromazine, which is an insect growth regulator. It is used in livestock, vegetable, and ornamental applications by interfering with insect molting and pupation. As herbicides, the triazines may be used alone or in combination with other herbicide active ingredients to increase the weed control spectrum. They are inhibitors of electron transport in photosynthesis. Tolerant plants are capable of metabolizing the active ingredient, whereas susceptible plants do not. Triazines are some of the oldest herbicides, with research initiated on their weed control properties during the early 1950s. As a family, their chemical structures are heterocyclic, composed of carbon and nitrogen in their rings. Most, except for metribuzin, are symmetrical with their altering carbon and nitrogen atoms. Herbicide members of this family include atrazine, hexazinone, metribuzin, prometon, prometryn, and simazine. Atrazine is widely used in corn, and was estimated to have been the most often-used pesticide in the U.S. during the late 1990s. Other atrazine uses include selective weed control in turfgrass, sugarcane, sweet corn, and sorghum. Some of its uses are classified as restricted because of ground and surface water concerns. Hexazinone is used primarily in alfalfa, pastures, pine plantations, rights-of-way, and other industrial sites. Because of its different chemical properties, metribuzin has different use patterns from the other triazine herbicides. It is used in soybean and some vegetables for selective control of broadleaf weeds. Prometryn is labeled for use in Florida on cotton, celery, and several other specialty vegetables. Simazine has the most crops and sites labeled for use of the triazines and simazine is commonly used in citrus weed control programs in Florida. Some specific uses of simazine, such as on grapes and certain berries, are classified as restricted. Product formulations of the triazine pesticides vary widely.

During the 1980s, metribuzin was restricted in its use classification by the EPA because of questions regarding groundwater contamination and chronic toxicity. Later, manufacturers of metribuzin resolved this once they submitted the necessary data to disprove these concerns. It is now classified as a general use pesticide. Prometon products bear the signal word "WARNING" because of substantial but temporary eye injury potential. Any serious toxic effects caused by prometon, prometryn, or simazine are not likely.

Mammalian toxicities for the triazine pesticides are shown in Table 1. Table 2 lists the toxicities to wildlife by the common name of the pesticide. Table 3 provides a cross listing of many of the trade names that these products are registered and sold by in Florida.

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