向日葵不同播期对葵螟避害效果研究

摘要：在巴彦淖尔市3个旗县区利用当地主栽向日葵品种-美葵LD5009，从5月1日至6月14日每隔5天播种1次，共进行了10个播期对向日葵螟避害效果的试验，结果表明，在巴彦淖尔市从东到西各试验区向日葵受害程度依次严重，而且5月20日至5月30日期间播种的向日葵，葵盘和籽粒平均受害率较轻，分别为6.47%~23.30%、0.17%~0.47%，以5月25日受害最轻。5月20日前播种，表现出播期越早受害越重的趋势，5月30日以后，随播种期的推迟受害再次逐渐加重，但晚播籽粒受害率较轻。在巴彦淖尔市防治向日葵螟采用当地主栽品种-美葵LD5009避葵螟为害的最佳播种期为5月20日~6月5日。

Effect of Sowing Date on Damage Avoidance in Homoeosoma nebulellum Hübner

Distant hybridization between four kinds of Avena nuda L.and Triticum.aestivum were conducted by reciprocal mating modes.Crossability between hexaploid Avena nuda L.and Triticum Aestivum was studied.Hybrid seed set ratios were investigated.Hybrid was inducted callus.The results showed that：different varieties and different mating modes made difference in crossability between hexaploid Avena nuda L.and T.Aestivum.Seed set ratios of ＇ Baiyan2 ＇ hybrids were the highest among all hybrids by ＇ Baiyan2 ＇ as female and T.Aestivum as male.That was 12.98%.Seed set ratios of ＇ Baiyan5 ＇ hybrids were the highest among all hybrids by ＇ Baiyan5 ＇ as male and T.Aestivum as female.That was 6.25%.Seed set ratios between the same parents were different with different mating modes.Rates of calli induced of all hybrids were high.