Synergistic effect of compound fungicides by nano-Mg (OH)2 and field application technology.

The inhibitory activity of some fungicides against kiwifruit canker was evaluated by ultraviolet spectrophotometer. Mixing two active fungicides, nano-magnesium hydroxide was used as the drug carrier to study loading capacity to the mixed fungicide. The synergistic effect nano-magnesium hydroxide on the anti-kiwifruit canker bacteria of the mixed compound fungicide was evaluated. Besides, the field application effect of compounded drags loaded with nano-Mg (OH) 2 was studied. The results showed that the tested bactericidal agents all showed a certain inhibitory activity against kiwifruit canker. Among them, the compound drag- nano-Mg (OH) 2 had the best antibacterial activity with an EC50 of 23.50 µg/mL, followed by the compound drug with an EC50 of 42.11 µg/mL. The use of nano-magnesium hydroxide as the drag carrier has a good synergistic effect on the drug against kiwifruit canker. It can significantly improve the antibacterial activity of the drug. And the content of nano-Mg (OH) 2 has a significant effect on drug loading and encapsulation efficiency. When the magnesium hydroxide content was increased from 1 mg to 3.5 mg, the drug loading increased by 43% and the encapsulation efficiency increased by 11%. In addition, the compound drag- nano-Mg (OH) 2 carrier agent has a good field control effect on kiwifruit canker, and the control effect can reach 73.8%. [ABSTRACT FROM AUTHOR]