5种检测方法对嗜卷书虱实仓检测效果的对比研究

Comparison of five methods of in situ detection of Liposcelis Bostrychophila Badonnel in grain mass

书虱是储粮中易于发生且防治难度很大的虫种之一,检测其种群动态是综合治理的基础,而利用不同方法检测该害虫种群变化的敏感性不同,了解和掌握各检测方法之间的关系尤为重要。在散储小麦的平房仓内,采用探管诱捕器、波纹板诱捕器、两层瓦楞纸板诱捕器、三层瓦楞纸板诱捕器和取样筛检5种检测方法进行了粮堆表层嗜卷书虱的检测及效果比较。结果表明:当取样筛检嗜卷书虱密度≤5头/kg或6头/kg≤嗜卷书虱密度≤10头/kg水平时,两层瓦楞纸板诱捕器检测方法比其他检测方法能较早、较多地发现书虱;当10头/kg<嗜卷书虱密度≤30头/kg水平时,探管诱捕器和取样筛检方法均比其他检测方法较早发现害虫,以探管诱捕器检测方法发现害虫数量较多;当嗜卷书虱密度>30头/kg水平时,取样筛检法的有效性最好。5月下旬为粮堆表层嗜卷书虱发生始期,6月初进入发生高峰期并维持2个月左右,之后嗜卷书虱虫口密度开始下降进入衰落期。对粮仓表层不同部位的嗜卷书虱发生情况进行检测,结果发现:在粮堆表层西南部和中部种群密度较高,西北部和东南部次之,东北部最少。

Psocids,as a common pest population in the stored grain,are difficult to control in a field granary.Detecting the dynamics of the psocids population is the base of integrated pest management.Since the differences in sensitivity of various detection methods are significant,it is very important to know the relationships of these methods.Probe trap,corrugated-plastic dish trap,2-layer corrugated-cardboard trap,3-layer corrugated-cardboard trap,and manual sampling sieving method were used to detect the population density of Liposcelis bostrychophillus Badonnel in the top layer of the grain mass.The results were as follows:based on the population density(d)of L.bostrychophillus detected by the manual sampling sieving method,1)when d≤5 individuals per kilogram(I/kg)or 6 I/kg≤d≤10 I/kg,the detection method with 2-layer corrugated-cardboard trap could detect L.bostrychophillus earlier and more than the other methods.2)when 10 I/kg<d≤30 I/kg,both probe traps and manual sampling sieving method could detect L.bostrychophillus earier than the other methods.The number of L.bostrychophillus detected by probe traps was maximum in all methods.3)when d>30 I/kg,the manual sampling sieving method was the most effective method.The primary occurrence of L.bostrychophillus was in the last period of May in the top layer of the grain mass.The peak occurrence started at the beginning of June and maintained for about 2 months,and then the pest density decreased.It was found that the pest density was higher in the southwest and central part of the grain mass,followed by that in the northwest and southeast part,and the least in the northeast part.