杀虫单、氟虫腈及其混剂对二化螟的防治效果

20 0 0～ 2 0 0 1年在安徽省庐江县进行了 2次药剂及剂量对二化螟的防治和保苗效果试验。试验1表明 ,40 %氟虫腈·杀虫单WP 42 0g(每hm2 有效成分用量 )处理的虫口减退率为 94 7% ,与 5 40g,660g及 5 %氟虫腈 (锐劲特 )SC 3 0g处理相差不大。试验 2表明 ,3 0 %杀虫单·氟虫腈WP 2 70g喷雾即可达到96 2 %的防效 ,接近 3 60g和 5 %氟虫腈SC 2 2 5g的效果。 2次试验中各处理的保苗效果与虫口减退率基本一致。比较药剂成本 ,可见这 2种新型复配剂对二化螟具有良好的防治和保苗效果 ,且上述剂量是经济高效的。

Performance of monosultap, fipronil and their mixtures for control of the rice stem borer,Chilo suppressalis

In 2000～2001, two field experiments were conducted on the performance of monosultap, fipronil and mixtures of these substances in control of the rice stem borer, Chilo suppressalis (Walker). The experiments were conducted in Lujiang County, Anhui Province where rice stem borer infestations are severe. The first experiment showed that a 40% mixture of fipronil + monosultap WP 420 g (a. i./ hm2) resulted in 94.7% mortality, which did not differ much from the mortality following application of 540 g or 660 g of the same compound or 5% fipronil SC 30 g. The second experiment established that a 30% mixture of monosultap + fipronil WP 270 g resulted in 96.2% mortality, close to that following application of 360 g of the same compound or 5% fipronil SC 22.5 g. Considering material costs, we recommend using these two new mixtures at dosages of 420 g and 270 g, respectively over a similar area for the present.