After the pesticide is wrapped in nanocapsules, the absorption of the plant becomes slower

Pesticide nanoencapsulation and its foliar application are effective ways to improve the current pesticide application efficiency. Recently, a scientific research team from McGill University in Canada studied the absorption and transport of organic pesticides after the application of silica nanocapsules on the foliar surface of tomatoes, and found that the absorption and transport of nanocapsules and non-capsule pesticides by plants were significantly different. The results were published online on April 25 in Environmental Science and Technology.

In this study, the researchers used a porous hollow silica nanocapsule particles (PHSNs) with an average diameter of 253±73 nanometers, and wrapped an organic pesticide, azoxystrobin, with a loading efficiency of about 67% for azoxystrobin. Such nanocapsules of pesticides are then sprayed on the upper leaf surface of the tomato plant and the release of the pesticide and the absorption of the foliage of the plant are observed over a few days. As a control, the team sprayed non-encapsulated pesticides and capsule granules without pesticides on separate foliage.

The study found that the absorption and release rate of nanoencapsulated pesticides is slower than that of non-encapsulated pesticides. After 4 days of applying 20 μg of nanocapsule pesticides on one leaf of each plant, a total of about 8.7 μg of azoxystrobin was measured in different plant sites. At the same time, the scientific research team also characterized the absorption and transport of PHSNs in plants, and found that after 4 days, the total silicon transport was 15.5 ± 1.6 micrograms, and the absorption rate and transport mode of PHSNs were significantly different from the pesticides they were loaded with.

Transport of nanocapsules of pesticides in plants. Image from the paper

Further studies found that PHSNs were transported throughout the plant. However, the transport mechanism of nanoparticles in plants is not very clear at present, and the research team believes that it is necessary to continue to carry out in-depth research. (Source: China Science Daily Zheng Jinwu)

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