bananas |
40 g ai/ha |
cereals |
30-40 g ai/ha |
lettuces |
52.5-70 g ai/ha |
spinach |
52.5 g ai/ha |
tobacco/vegetables |
12.5-35 g ai/ha |
tomatoes |
0.75-1 oz ai/100 gallons (~0.14-0.19 g ai/l) |
commercial rates for other crops are still under investigation. |
Mallard duck |
LD50 >2,000 mg/kg |
Bobwhite quail |
LD50 >2,000 mg/kg |
Rainbow trout [96 h] |
LC50 0.88 mg/L |
Green algae |
EC50 3.3 ppm |
Daphnia magna |
LC50 2.9 mg/L |
Bee [48 h] |
LD50 >100 μg/bee |
Sheepshead minnow |
LC50 1.7 ppm |
Mysid shrimp |
LC50 0.88 ppm |
Bluegill sunfish[96 h] |
LC50 1.6 mg/L |
Duckweed |
EC50 0.312 ppm |
Earthworm |
LC50 >1,000 mg/kg |
Fate in :
Acibenzolar-S-methyl is practically non-toxic to terrestrial animals on an acute and subacute basis, it is practically non-toxic to insects, it is moderately to highly toxic to freshwater and estuarine aquatic animals on an acute basis and it is toxic to aquatic plants.
Fate in soil:
The compound is rapidly degraded in the environment by abiotic and biotic processes. The product is rapidly degraded in aerobic soil (DT50 < 1 day), the process is slower in anaerobic systems. The major degradate is the carboxylic acid derivative, CGA-210007. This metabolite degrades rapidly in aerobic soil with a half-life of 16.5 days. Under anaerobic conditions, CGA-210007 is degraded very slowly. Light enhances the slow degradation on dry soil and the degradation of the CGA-210007 metabolite rapidly formed on wet soil.
Fate in aquatic systems:
Acibenzolar-S-methyl is rapidly degraded by photolysis in aquatic systems. It has a DT50 of less than one day. The rate of degradation by hydrolysis is considerably slower; the DT50 is 3.8 years at pH 5, 23.1 weeks at pH 7 and 19.4 hours at pH 9.
Fate in :
Adsorption and field studies show that movement of parent compound below the top 3 inches of soil is unlikely and the rapid degradation is the major factor in this behaviour. Acibenzolar-S-mehtyl is not expected to accumulate in aerobic sediments. The major metabolite, CGA-210007, is considerably more mobile and could accumulate in groundwater if it reaches depths at which anaerobic conditions are encountered.
Based on combined environmental exposure and ecological toxicity, it is unlikely that acibenzolar-S-methyl will pose a risk of acute or chronic toxicity to non-target animals.
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