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《PESTICIDES》 1996-01
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Study on the Action Speciality of Profenofos and Other Seven Pesticides to Different Instars of Cotton Bollworm

Wang Chengju; Zhang Wenji (Department of Applied Chemistry, Beijing Agricultural University, Beijing)  
Toxicity of profenofos and other seven pesticides common used in the cotton fields to cotton bollworm, walker and aphid was revealed in detail with drop and immersion methods. The LD50 or LC50 of profenofos, parathion-methyl,methomyl, fenvalerate, phoxim, endosalfan monocrotophos methamidophos to cotton bollworm, walker, aphid were the following respectively : second instar of cotton bollworm 8, 37,183, 120, 57, 109, 493, 988ppm; third-instar 2. 2, 4. 1 , 4. 3,3. 3, 6. 9, 16, 21. 9, 14. SPglmg ( 1×10-3) ; forth-instar 60. 55,1164, 452 , 64 , 230, 1978, 1213 ppm; walker 0. 14, 22. 2, 0. 67 .1. 0,-, 5. 5, 9. 6, 23. 8μg/mg (1×10-3) ; aphid 1. 61, 3. 67,0. 55, -, 4. 35, 0. 67, 0. 71,- μg/mg (1×10-2). The controlrate to the eggs of cotton bollworm were 49. 6, 87. 7, 66. 9,97. 2, 37. 5, -15. 8, 18. 4, 20. 6%, the death rate of early-instar of cotton bollworm were 91. 9, 71. 4, 70, 100, 91. 9, 92. 9,61. 7, 97. 1% respectively.The action and suitable time of all these pesticides were discussed.
【CateGory Index】: S435.622.3
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