Thread: Ants!
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Old 11-17-2012, 01:15 PM
Duekster Duekster is offline
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Trend results for insecticides indicated widespread significant downward trends for chlorpyrifos (especially 1996–2004), diazinon (1996–2004 and 2000–2008), and malathion (especially 1996–2004); widespread significant upward trends for fipronil and its degradation products (2000–2008); and mostly nonsignificant trends for carbaryl (1996–2004 and 2000–2008). The downward trends for chlorpyrifos and diazinon were consistent with the regulatory phaseout of residential uses of these insecticides and the upward trends for fipronil and its degradation products were consistent with its introduction in 1996 and subsequent increasing use as a possible substitute for chlorpyrifos and diazinon. The downward trends in malathion may be caused by voluntary substitution of pyrethroids or fipronil for malathion. Although carbaryl trends were mostly nonsignificant, most of the trends for 1996–2004 were upward and four of the upward trends were significant. The upward tendency in carbaryl concentrations during that time may indicate some substitution of carbaryl for chlorpyrifos and diazinon. For 2000–2008, carbaryl trends were mixed upward and downward and the trends were mostly nonsignificant. Despite voluntary cancellation of some residential uses of carbaryl beginning in about 2000, there were only four significant downward trends during 2000–2008 and two significant upward trends during that time. Voluntary cancellations of some carbaryl uses may not have decreased overall carbaryl usage in some areas, or decreases in some uses may have been offset by substitution of carbaryl for chlorpyrifos and diazinon.

The entire report here

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