Control effect of plant dry powder,its mixtures with diatomite,and with diatomite and insecticide against
maize weevil(Sitophilus
zeamais Motschulsky) in wheat was tested.Under the natural conditions,it was found that the mixture of the diatomite,0.4% enidiadin EC and 5% fenoxycard WP,the mixture of the Spigelia anthelmia dry powder with diatomite,95% malathion EC and the mixture of the Spigelia anthelmia dry powder with diatomite,5% regent EC were much better than any other mixtures after 15 days,and the corrected morality rate of the
maize weevil all was 100%.Among the mixtures of the four plant dry powder with diatomite,the Spigelia anthelmia
botanical insecticidal powder was much better than the other three,and the corrected morality rate was 22.88%;Among the four dry plant powders,the Spigelia anthelmia dry powder was the best and it was able to keep more longer effeet than the other three.The effectiveness of the mixture of plant dry powder,diatomite and chemical insecticide was much better than utilizing pure plant dry powder or pure chemical insecticide only;the effectiveness of the mixture of plant dry powder and diatomite was much better than utilizing pure plant dry powder only.