种衣剂对褐飞虱取食行为的影响

Effects of Rice Seed Coating Agents on the Feeding Behavior of Brown Planthopper(BPH),Nilaparvata lugens(Stal)

本研究利用EPG技术监测了两种种衣剂的3个不同处理对褐飞虱取食行为的影响,结果表明,褐飞虱于种衣剂处理后的水稻不同组织上取食的EPG波形与对照相比基本一致,出现7种典型的取食波形np、N1、N2、N3、N4-a、N4-b、N5,种衣剂处理后褐飞虱取食波形持续时间趋势与对照相比基本一致,其间差异未达显著水平(P>0.05),但三种处理在韧皮部的持续时间均大于对照处理组,尤其是N4-b波形;2.5%的咯菌腈、γ-PGA、2.5%的咯菌腈+γ-PGA种衣剂处理后褐飞虱在水稻上取食位点持续时间T(T为NC+N4+N5的总百分率)百分比分别达99.75%、99.37%和99.17%,而对照处理组的取食位点选择持续总时间占总监测时间的89.65%,其间差异达显著水平(P<0.05);对照和γ-PGA药液单独处理np波形出现次数明显多于2.5%咯菌腈单独处理及其与γ-PGA药液混合处理组:而不同处理组N4-b型波的最长持续时间差异最明显,与对照相比差异达显著(P<0.05),对照组持续时间最短,平均时间为8903.27秒,而2.5%咯菌腈单独处理组持续时间最长,平均时间为11151.72s。

The feeding behavior of BPHs of three different treatments was monitored by EPG.The results showed that there were not differences among the treatments of SCAs and control about feeding duration waveforms of BPHs on different tissues of rice.The EPG signals of BPH are made up of seven distinctive waveforms,which are np,N1,N2,N3,N4-a,N4-b and N5,respectively.This duration in phloem of three SCAs treatments was longer than that in control,especially for the N4-b waveform.In the three treatments(2.5%fludioxonil treated alone,γ-PGA treated alone and mixture of the two SCAs),the total time of duration on a feeding site on rice seedling for BPHs,which means the total percentage of NC plus N4 plus N5 total percentage,was99.75%,99.37%and 99.17%,respectively,which had significant difference compared with that of controls(P<0.05,89.65%for controls).Considering the occurrence numbers of EPG waveform in different treatments,the occurring numbers for np in control andγ-PGA treated alone were significantly higher than that in 2.5%fludioxonil treated alone and mixture treatments.The duration for N4-b waveform in three treatments of SCAs was all significantly different from that of controls(P<0.05).Among of them,the duration for N4-b waveform in 2.5%fludioxonil treated alone took 11 151.72 seconds,which was the longest,and that of controls only did 8 903.27 seconds,which was the shortest.