Light is a important way in controlling vegetable pests. In this work, we examined the effects of blue light on Bemisia tabaci on cucumbers, as well as on nutrients, secondary metabolites, and resistance-related enzymes in cucumbers. Results of the direct repellent test showed that blue light had a strong repellent effect on B. tabaci, which increased with light intensity and exposure time. The repellent effect of direct light was stronger than that of transmitted light under the same light intensity and time. The population decline rate of B. tabaci was 77.7% after direct exposure to 1200 lx blue light for 5 min, being 17.4% higher than that of transmitted light. After 2 min exposure to 1750 lx blue light, the population decline rate was 41.2%, which was 10.6% higher than that of transmitted light. Under the condition of pot culture, blue light also had a good repellent effect on B. tabaci on leaves. The corrected population decline rate of B. tabaci reached 88.5% after 5 h exposure to 100 lx blue light. Blue light affected the development of B. tabaci. In addition, blue light significantly increased the contents of soluble sugar, free protein, total phenols and flavonoids in cucumber leaves, decreased the content of proline. The contents of trans-β-farnesene, trans-2-hexenal, cis-4-heptanal, trans-β-ocilene, D-carvone, longifolene and 3-carene, and the activities of peroxidase, catalase, superoxide dismutase, ascorbate peroxidase were significantly increased. The results suggested that blue light could drive off B. tabaci and influence the resistance of cucumber. 100 lx blue light had a good control effect on B. tabaci.
利用灯光控制害虫是蔬菜害虫绿色防控的重要手段。本研究探讨了蓝光对黄瓜烟粉虱种群及黄瓜营养物质、次生代谢物、抗性相关酶的影响。结果表明: 在直接驱避试验条件下,蓝光对烟粉虱成虫有较强的驱避作用,光照强度越大、照射时间越长,对烟粉虱的驱避作用越强。在相同光强和光照时间下,直射光较透射光的驱避作用强。其中,1200 lx的蓝光直射烟粉虱5 min后,烟粉虱的虫口减退率为77.7%,比透射光高17.4%;1750 lx的蓝光直射2 min后,虫口减退率41.2%,比透射光高10.6%。盆栽条件下,蓝光照射对黄瓜叶片上的烟粉虱也有较好的驱避作用,100 lx蓝光照射5 h后,烟粉虱种群的校正虫口减退率达到88.5%。蓝光对烟粉虱的生长发育有一定的影响,随着蓝光照射时间的延长,烟粉虱发育历期延长。此外,蓝光照射显著提高了黄瓜叶片中可溶性糖、游离蛋白、总酚和类黄酮含量,降低了脯氨酸含量,与烟粉虱抗性相关的挥发物反式-β-法尼烯、反式-2-己烯醛、顺式-4-庚烯醛、反式β-罗勒烯、D-香芹酮、长叶烯和3-蒈烯含量,以及过氧化物酶、过氧化氢酶、超氧化物歧化酶和抗坏血酸过氧化物酶活性均显著提高。说明蓝光照射能直接驱离烟粉虱,并通过改变烟粉虱寄主蔬菜的代谢途径来提高寄主蔬菜对烟粉虱的抗性。其中100 lx的蓝光照射对田间烟粉虱有较好的控制作用。.
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