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 drugs 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 drug- 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 drug 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 drug- nano-Mg(OH)2 carrier agent has a good field control effect on kiwifruit canker, and the control effect can reach 73. 8％.
kiwifruit cankercompound synergistic effectnano-Mg(OH)2fungicidefield control effect
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