根部吸收氟啶虫酰胺在玉米植株中的分布特点及对玉米蚜虫活性效果评价

采用水培营养液施药的方法,评价氟啶虫酰胺在玉米植株内的时空分布规律和对玉米蚜虫的活性效果。结果表明,根部吸收氟啶虫酰胺后,玉米地上部氟啶虫酰胺积累量于药后4~8d达到最大值,之后缓慢减少;根部氟啶虫酰胺持留量在药后1~2d逐渐增加,2~32d相对稳定;从对玉米蚜虫的活性效果来看,氟啶虫酰胺各浓度药后1d即表现出一定的防治效果,防效在23.33%~38.22%,蚜虫蜜露分泌数极显著低于空白对照,随着处理时间的延长,氟啶虫酰胺对蚜虫防治效果逐渐增高,处理后16d,氟啶虫酰胺31.25和125.00mg/L处理的防效分别达88.60%和99.49%,蜜露抑制率分别达96.70%和99.95%,蚜虫蜜露分泌数随着药液处理浓度的提高而逐渐减少,蚜虫蜜露抑制率高于相同时间和相同浓度下的虫口防治效果。因此,氟啶虫酰胺可通过玉米地下部处理防治蚜虫。

Systemic Distribution of Flonicamid in Maize and Its Activity Effect against Rhopalosiphum maidis with Root Absorption

Systemic distribution of flonicamid in maize and its activity evaluation against Rhopalosiphum maidis were investigated by application of hydroponic nutrient solution. The results showed that flonicamid accumulation in maize aboveground peaked 4-8 days after treatment and subsequently gradually dropped. After root-drenching, the retention of flonicamid in the root rose for 1-2 days, then remained generally steady for 2-32 days. According to the activity effect of flonicamid on R.maidis, after one day of treatment, all treatments demonstrated a certain control effect, with values ranging from 23.33% to 38.22% and honeydews substantially lower than the control group. The control effect of flonicamid on R.maidis was gradually increased with the increase of treatment time, the values of 31.25 and 125.00mg/L treatments after treated 16d were 88.60% and 99.49%, and the inhibition rates of honeydews were 96.70% and 99.95%, respectively. The honeydews of R.maidis decreased gradually with the increase of concentration, and the inhibitory rate of honeydews was higher than that of the control under the same concentration and time. Therefore, flonicamid can be used to control R.maidis through underground treatment of maize.