Preparation of a new fluopyram‐loaded nanocomposite with eco‐environmental safety and its control effect on root‐knot nematode disease

BACKGROUND Metal–organic frameworks (MOFs) loaded with pesticides have unique porous structure and excellent functional properties, which can solve lower utilization rate and pesticide residues of chemical pesticides. RESULTS ZnMOF@SiO 2 loaded with Fluopyram (Flu) was prepared for the first time. The nanocomposite ZnMOF@SiO 2 @Flu was observed to be spherical under SEM, with a loading rate of (28.38 ± 0.77) %, and a zeta potential of −37.35 mV, and the thermal stability was 61.47% higher than that of Flu. It had pH‐responsive release function with a best release rate of 75.54% at pH 6.5 within 96 h, and the release model conformed to Ritger‐Peppas equation. The LC 50 value of ZnMOF@SiO 2 @Flu treatment (72 h) against Meloidogyne incognita was 8.384 μg/mL, which was about 1.7 times that of Flu treatment. Importantly, the control effect of it against root‐knot nematode in a pot experiment reached up to 94.85% at a concentration of 200 μg/mL, which was significantly stronger than that of Flu, due to an excellent pH response release function of ZnMOF@SiO 2 @Flu. Therefore, the amount of Flu applied was significantly reduced by using this controlled release system. Moreover, this nanocomposite promoted seed germination and plant growth, exhibited excellent biocompatibility with non‐target soil invertebrate ( Eisenia fetida ), and positively reshaped the rhizosphere microbial community structure. CONCLUSION These findings suggest that the highly eco‐friendly ZnMOF@SiO 2 @Flu nanocomposite has great potential in the prevention and control of M. incognita .