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- W2000993875 abstract "Fumigations were conducted in a 17001. chamber with methyl bromide or phosphine, subjecting diapausing larvae of Ephestia elutella at 20°C, 70% r.h. to three selected concentration-time (CT) products over a wide range of concentrations and exposure periods. With concentrations of methyl bromide between 2·9 and 15·0 mg/l., the CT product required for 50 per cent mortality was about 80 mg hr/l. The threshold concentration for a lethal response was found to lie between 0·62 and 1·15 mg/l. while with a concentration of 20 mg/l, the LD 50 was increased beyond the selected range of CT products. With the lowest concentration of phosphine tested, 0·02 mg/l., an LD 50 of 4·6 mg hr/l. was obtained. As concentrations were raised from 0·02 to 0·27 mg/l., and exposure periods were correspondingly decreased, there was a gradual increase in the CT product required for a particular level of kill. With higher concentrations, much lower mortalities were obtained at each CT product tested, and with a concentration of 1·4 mg/l., no significant kill was observed with any exposure period tested. At concentrations around 1 mg/l., mortality with phosphine was very low in exposures of less than 6 hr." @default.
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- W2000993875 date "1973-10-01" @default.
- W2000993875 modified "2023-10-16" @default.
- W2000993875 title "The effect of concentration and exposure in tests with methyl bromide and with phosphine on diapausing larvae of Ephestia elutella (Hübner) (Lepidoptera, Pyralidae)" @default.
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- W2000993875 doi "https://doi.org/10.1016/0022-474x(73)90024-6" @default.
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