蓝光照射对黄瓜无翅瓜蚜驱避行为的影响

蓝光照射可以降低黄瓜Cucumis sativus上蚜虫的种群密度，但蓝光照射后无翅蚜虫是如何被驱离的尚未见报道。本文以盆栽黄瓜为供试材料，研究蓝光照射对黄瓜上无翅瓜蚜Aphis gossypii驱避行为的影响。结果表明，蓝光照射对设施黄瓜上的无翅蚜有较强的驱避作用，光照强度越大、照射时间越长，黄瓜上蚜虫的虫口减退率越大。蓝光照射后无翅蚜主要通过黄瓜主茎离开黄瓜向花盆的土下迁移，少部分蚜虫还可以顺着花盆向盆外迁移。光强越强，相同时间内迁离黄瓜的蚜虫越多。300 lux蓝光照射10 h后，蚜虫种群的校正虫口减退率达到64.03%。相同的蓝光光强和照射时间下，晚间蓝光照射处理后蚜虫的迁移数量多于白天。地面黄光环境对蓝光驱避黄瓜蚜虫具有较强的促进作用，盆外放置黄板，迁向盆外的蚜虫量增加。黄光点亮30 min后关闭，同时打开蓝光可以提高蓝光对蚜虫驱避作用。因此，蓝光照射可以驱离黄瓜上的无翅蚜，驱离的无翅蚜主要迁移到盆内土中，少量的可以迁出花盆。

Effects of blue light irradiation on the repellent behavior of wingless Aphis gossypii on Cucumis sativus

Blue light irradiation could reduce the population density of aphids on cucumbers, but there was no report about how the wingless aphids were driven away from the host plants by blue light. In this paper, the effects of blue light on the repellent behavior of wingless aphid were studied by using potted cucumber as test material. Our results showed that blue light could significantly increasing the aphid declines rate along with the increasing of light intensity and irradiation time. During the same irradiation time, it was observed that the more numbers of aphid migrated from the cucumber along with the increasing density of blue light. The aphids migrated from the cucumber to the soil of the flowerpot mainly through the main stem of the cucumber, and a small number of aphids could also migrate along the flowerpot to the outside of the pot. After exposure to 300 lux blue light for 10 hours, the corrected population decline rate of aphid reached to the 64.03%. Compared with that in daytime, the treatment at night with same blue light intensity and irradiation time caused increased number of migrated aphids. The repelling effect of blue light on cucumber aphids were strongly promoted by the yellow light environment. Putting yellow board placed outside the flowerpot lead to the increase in the numbers of aphid migrated to the outside of the pot. Extra 30 mins of yellow light irradiation just before blue light treatment could promote the repelling effect of blue light on aphids. The conclusion was that the blue light irradiation could drive off the wingless aphid from the cucumbers to the soil in the pot, and a small amount of aphid could be migrated out of the flowerpot.