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Experimental observation on the effectiveness of pirimiphos-methyl against Anopheles sinensis



Experimental observation on the effectiveness of pirimiphos-methyl against Anopheles sinensis



Chinese Journal of Parasitology and Parasitic Diseases 6(1): 4-7



A field trial was conducted in 1985 in the area of Jining (35 degrees 15'N, 116 degrees 25'E), Shandong Province, China, to evaluate the effectiveness of pirimiphos-methyl in controlling A. sinensis, the main vector of malaria there. In district A (9.4 kmsuperscript 2), all human dwellings and animal shelters were sprayed (at 2 g a.i./msuperscript 2) while in district B (13 kmsuperscript 2) only the animal shelters were sprayed (at 2.25 g a.i./msuperscript 2). District C (9.3 kmsuperscript 2) was left unsprayed. Effectiveness was evaluated by 3 methods conducted weekly for 10 weeks after spraying and at 2-week intervals for a further 4 weeks: (1) morning collections of resting mosquitoes; from bedrooms (RB) or animal shelters (RA), (2) 3-hour past-sunset man-baited net catches in houses (MNI) and outside (MNO), and (3) 3-hour past-sunset cattle-baited net catches in cattle shelters (CNI) and outside (CNO). From the tables of results it can be calculated that compared with catches in the unsprayed district C, in district A and B <5% of A. sinensis rested on sprayed surfaces, an effect which persisted at least partially for the whole 4 weeks; in district B, however, where only animal shelters were sprayed, RB catch yields doubled. Similar trends were shown for the first 5 weeks after spraying in the man-baited net catches in district A where MNI and MNO catch yields dropped by 50 and 76%, respectively, while in district B the MNO figures fell by 73% and MNI figures doubled, again indicating an expellent diversion effect of the residual spray. This was also shown in the cattle-baited net catches in which the 5 weeks after spraying the CNI catches fell by some 60% in district A and 50% in district B, but CNO catches rose by 50-60% in both districts. The authors nevertheless state that the parous rate of A. sinensis declined significantly in the 3 weeks following spraying, and this coupled with the evidence that full coverage spraying reduced baited catch yields more than did the spraying of animal shelters alone signifies a certain measure of control.

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Accession: 001831886

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PMID: 3383392



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