The preparation and application of nanoscale sex attractant lures against Spodoptera frugiperda.
Objective: Prepared nanoscale sex attractant lures for Spodoptera frugiperda, and carried out field trapping experiments to screen out the best and effective lure to provide reference for monitoring and green control of S. frugiperda. Method: The amphiphilic lipid molecule(DSPE-mPEG5000)was used as a nanocarrier to encapsulate sex pheromone to form sex pheromone colloidal particles of S. frugiperda by a co-solvent method, and the nanoscale lure was prepared with 0.22 μm polyethersulfone membrane as sustained-release material. The amount of trapped S. frugiperda with different sustained- release carrier materials and different qualities of lures were compared by field bioassay method. Result: The lure with mass ratios of Z9-14:OAc,Z7-12:OAc, and Z11-16:OAc=90:0.5:9.5 caught the most S. frugiperda. The sex pheromonecolloidal particles were spherical with a mean diameter of 40 nm, and it had fine dispersion performance. The nanoscale sex attractant lures with the sustained-release carriers of 0.22 μm polyethersulfone membrane caught the most S. frugiperda males, which was 6.07 moth/d;followed by the sustained-release carriers of PVC capillary, while natural rubber plugcaught the least. The trapped effect was the best when nanoscale sex pheromone attractants was 2.0 mg, which was significantly better than all the attractants except 1.5 mg(P < 0.05). Conclusion: The nanocarrier DSPE-mPEG5000 can effectively slow down the decomposition and oxidation rate of sex pheromone and prolong the volatilization time. The 0.22 μm polyethersulfone membrane carrier has obvious adsorption effect on sex pheromone colloid particles, and the nanoscale sex attractant lures has good indoor attractant and field trap effect on S. frugiperda. The nanoscale lure can be further developed and used in the monitoring and control of S. frugiperda.