关键词: 毒力测定, 不等单蚤, 氯氰菊酯

Abstract: This test concerns the toxicity of Cypermethrin(NRDC-149) for the eggs, larvas, cocoons and imagoes of Monopsyllus anisus, The resultsare as follow: When the Glass Bottle Medicinal Membrane Method is used for the imagoes of M. anisus, and it is found that the LD₅₀ (μg/cm²) of the fedflea or unfedflea have all shown (0.031>0.009 and 0.014>0.005): fedfleas of the same sex were higher than unfedfleas (: 0.031>0.014 and 0.009>0.005). The result is the same as the regular pattern. The Petri Dish Medicinal Membrane is used for the larvas, the LD₅₀ (μg/cm²) of 3th-age-larvas (0.084)>flea (0.031); LC₅₀ 3th-age-laruas(19ppm)>eggs (5ppm); and when the Damp Absorption Method is used for the cocoons, the LC₅₀ 110ppm is higher than that of the eggs(5ppm), the 3th-age-larvas(19 ppm), and flea(8.7ppm).The resistance of the cocoons is the highest of the four. The feasibility of the Method of toxicity test of cocoons and the cause that LC₅₀ is on the high side have been discussed, and some points for attention have been put forward.