助剂380对杀菌剂在芒果叶片上展着能力的影响

Influence of Adjuvant 380 to the Adhesion Property of Fungicides on Mango Leaves

当今现有农药利用率低造成一系列社会问题,如非靶标生物和人畜安全受影响,以及环境污染等。如何提高现有农药的利用率迫在眉睫。为提高芒果生产中杀菌剂的有效利用率,结合芒果的特性,研究添加农药助剂对杀菌剂在芒果叶片上润湿展布性和农药持留量的影响,为农药的高效利用提供理论指导。本研究以防治芒果细菌性角斑病的杀菌剂为研究对象,通过测定液体在芒果叶片的接触角及不同浓度液体的表面张力,根据表面张力及接触角结果,获取芒果叶片的临界表面张力以及助剂的临界胶束浓度(critical micelle concentration,CMC)。通过添加助剂,分析其对药液在芒果叶片表面上展布和最大持留量(maximumretention,Rm)的影响。本研究中,助剂380从实验室前期研究基础上筛选得到,结果表明,助剂380可以降低药液表面张力,增加药液在叶面的润湿展布,对常用细菌性角斑病防治药剂表面张力值的降低范围为23.54%~75.94%,最低可达(17.62±0.65)mN/m,低于芒果叶片的临界表面张力;且加入助剂的药液能很好地在芒果叶面上展布,在芒果叶上的持留量显著增加,最大增加率为203.53%。因此,在芒果细菌性角斑病防治过程中,可以通过添加助剂380来提升药液在作物叶面的展布效果和持液量,从而提高农药的利用率。

Nowadays,the low effective utilization rate of existing pesticides has caused a series of social problems,such as the impact on the safety of non target organisms,human and livestock,and even environmental pollution.How to improve the utilization of existing pesticides is more urgent and necessary.Therefore,in order to improve the utilization of existing pesticides,the effects of pesticide additives playing an important role on the wetting distribution and pesticide retention of fungicides on mango leaves were studied in combination with crop characteristics,so as to provide theoretical guidance for improving the utilization rate of mango fungicides.Through measuring the contact angle of liquid in mango leaves and the surface tension of different concentrations of liquid,according to the results of surface tension and contact angle,the critical surface tension of mango leaves and the critical micelle concentration(CMC) of additives were obtained.The effects of additives on the distribution and maximum retention(Rm) of liquid medicine on the surface of mango leaves were analyzed.In this study,the fungicide for the control of mango bacterial angular spot was used as the research object.The effects of adjuvant 380 to different fungicides on the wetting property and retention on mango leaves were studied.According to the results of γ and contact angles tested by a contact angle/interfacial tension meter,the critical surface tension value of mango leaves and the critical micelle concentration(CMC) of adjuvant 380 were determined.The selected concentration of adjuvant 380 was added to different fungicides to analyze the change of wetting property and Rm.Adjuvant 380 could reduce the surface tension and increase the wetting property.It could reduce the surface tension of the agent by 23.54%-75.94%,and the surface tension value could be reduced to(17.62±0.65)mN/m,which was lower than the critical surface tension value of mango leaves.And the contact angles on the front and back sides of mango leaves were less than 30°,which could be well wetted on mango leaf surface.The adjuvant had more obvious effects on increasing the retention and 80% ethylicin emulsifiable concent with a 203.53%increasing of the amount of retention on the leaves was maximized of all the fungicides.Therefore,in the process of mango bacterial angular spot control,the distribution effect and liquid holding capacity of liquid medicine on crop leaves can be improved by adding additive 380 when mixed in barrels,so as to improve the utilization rate of existing pesticides.