LED风吸式杀虫灯对有效范围内茶小绿叶蝉虫口动态的影响

Effects of light-emitting diode light traps with a suction fan on the population dynamics of the tea leafhopper Empoasca onukii(Hemiptera: Cicadellidae) within the effective distance

为明确LED风吸式杀虫灯对茶小绿叶蝉Empoasca onukii的防治效果,室内测定诱虫光源对茶小绿叶蝉卵和若虫生长的影响,温室内测定不同灯高和不同灯距组合下杀虫灯诱捕的茶小绿叶蝉数量,并计算杀虫灯对茶小绿叶蝉成虫的有效控制范围、诱杀中距离、诱杀黄金距离,并通过2年田间试验比较杀虫灯有效控制范围内不同灯距处、有效控制范围外茶小绿叶蝉成虫数量。结果显示:诱虫光源对茶小绿叶蝉卵和若虫的生长无显著影响,若虫生长历期为18.5 d,存活率为46.85%。随着灯距和灯高的增加杀虫灯对茶小绿叶蝉的诱捕量下降,灯高20~40 cm时,杀虫灯对茶小绿叶蝉的平均有效控制范围、平均诱杀中距离和平均诱杀黄金距离分别为58.17、30.41和23.86 m。茶园内灯距5 m处,茶小绿叶蝉成虫数量率先达到5个灯距中的最大值,不同灯距下茶小绿叶蝉成虫数量随时间推移而呈现出显著差异,虫口峰期时灯距25 m内的茶小绿叶蝉成虫数量为灯距120 m处的49.5%~64.4%。表明LED风吸式杀虫灯可通过诱杀茶小绿叶蝉成虫显著抑制其诱杀黄金距离内茶小绿叶蝉的成虫数量。

To clarify the control efficacy of light-emitting diode light traps with the suction fan on the tea leafhopper Empoasca onukii,the influence of light source on the indoor growth of leafhopper eggs and nymphs,and the effects of lamp height and distance on the adult capture were studied;meanwhile,the effective insect-killing,median trapping and golden trapping distances of the light trap were calculated,and then the dynamics of adult population in different lamp distances were compared between within and beyond the effective insect-killing distance by field experiments.The results showed that the developmental duration and survivor rate of E.onukii from egg to adult was 18.50 d and 46.85%,respectively,which had no significant difference from the negative control.The adult capture would decrease when the lamp height and distance increased.As the lamp height was within 20-40 cm,the mean effective insect-killing distance,median trapping distance,and golden trapping distance were 58.17,30.41,and 23.86 m,respectively.In the field,the adult population of E.onukii in 5 m lamp distance first reached the maximum compared with those in other lamp distances.The adult populations in different lamp distances showed significant differences with the passage of time.During the population peaks,the adult population within 25 m lamp distance was only 49.5%-64.4%of that in 120 m lamp distance,which indicated that the light-emitting diode light trap equipped with the suction fan could significantly reduce the population of E.onukii within golden trapping distance by adult trapping.