Nathan Green

Reproducibility of the Toxicity Ratio of Allethrin to Pyrethrins Applied to House Flies by the Tutrntable Method

The 52 comparisons made in 10 years of the toxicity of allethrin and pyrethrins when applied by the turntable method to house flies ( Musca domestica L.) were summarized. The ratio of toxicity of allethrin relative to pyrethrins at the 50% mortality level ranged from 2.23 to 3.61. A somewhat wider range was that due to the difference in slope of regression lines; the grand means of the ratios at the 5%, 50%, and 95% mortality levels were very close to two, three, and four times, respectively.