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低温胁迫下30%噻虫嗪悬浮种衣剂对春小麦幼苗生长及生理的影响 总被引:1,自引:1,他引:0
为了明确低温条件下30%噻虫嗪悬浮种衣剂不同剂量对春小麦生长的安全性及对生理生化指标的影响,以其不同剂量包衣的春小麦为研究对象,测定了低温胁迫下春小麦株高、根长、地上鲜重、地下鲜重及叶片中叶绿素、可溶性糖、丙二醛含量的变化。结果表明,100kg春小麦种子用30%噻虫嗪悬浮种衣剂50 g包衣,在昼/夜温度为20℃/10℃、15℃/5℃条件下,能增加春小麦的株高和地上鲜重。但当胁迫温度降低、包衣剂用量增加时,春小麦的生长、叶绿素含量及可溶性糖的生成受到抑制,丙二醛的含量增加,且随着温度越低包衣浓度越大,抑制作用越明显,春小麦受到的伤害也越严重。用新烟碱类噻虫嗪悬浮种衣剂包衣后,在春季播种时,以推荐剂量的低剂量包衣种子为宜。 相似文献
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This study aims to elucidate the invasion source and develop scientifically sound and effective prevention and control measures for Spodoptera frugiperda in Gansu province.Using molecular markers based on mtCOI gene,we analyzed the genetic diversity index,genetic differentiation coefficient and gene flow of S.frugiperda across 12 geographical populations in 8 provinces of China.The results showed that the haplotype diversity and average nucleotide difference in Gansu populations ranged from 0.133 to 0.157 and 0.133 to 0.317,respectively.These values were lower than thoose observed in Guangdong,Guangxi,and Yunnan populations within the annual breeding areas of China,which ranged from 0.157 to 0.819 and 1.033 to 7.705 respectively.Both Tajima’s D neutral test and Fu’s F test yielded negative values across all populations,suggesting a significant population expansion event for S.frugiperda following its invasion of China.There was genetic differentiation between Sichuan population and others,while gene flow among 62 populations were found to be at an above-medium level.The cumulative effective emigration and immigration values for the Lueyang,Ningqiang,Huixian county and Chengxian county populations were 11 860.66,11 708.65,10 878.66 and 10 379.32,respectively.These play the role as relaying station in the process of gene exchange of S.frugiperda in China.The Hanshui Valley is an important corridor for the westward migration of S.frugiperda into the northwest in China. 相似文献
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通过3年调查明确,棉蚜在河西走廊荒漠绿洲生态环境下的寄主植物有14科51种,棉蚜发生高峰期为7月下旬至8月中旬,棉蚜蚜量(X)与籽棉产量损失率(Y)的回归方程为Y=12.0854+0.0105X(r=0.966);棉蚜的发生与地理环境、气候、灌水、作物布局关系极为密切。室内测定多异瓢虫成虫对棉蚜每日最大理论捕食量为625头,其3龄若虫捕食量为500头。棉区推广以调整作物结构、狠抓棉蚜越冬寄主的冬春防治,实行规范化栽培管理,协调运用各种防治措施,合理用药的综合防治技术规程,累计示范推广2.9万hm2,防治效果达90%以上,增产皮棉222.0kg/hm2,增产率为17.0%。 相似文献
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采用黄板诱杀及黄板诱杀与烟剂配合使用防治南美斑潜蝇的试验结果表明,番茄和茄子大棚悬挂黄板600~750张/hm2对南美斑潜蝇的防效:番茄的虫株率防效、虫口防效和叶面积防效分别达82.06%、89.67%和91.17%以上;茄子的防效分别为79.61%、83.82%和87.62%以上。悬挂黄板675张/hm2并配合应用10%烟熏死烟剂7500g/hm2对番茄、茄子大棚南美斑潜蝇的虫口防效分别为97.04%、95.76%。 相似文献
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