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Sterilizing microcapsule capable of preventing plant soil-borne diseases as well as preparation method and application method of suspending agent thereof

A microcapsule suspension and microcapsule technology, applied in botany equipment and methods, fungicides, plant growth regulators, etc., can solve the problems of fast release rate, short duration, and inappropriate effective control of soil-borne diseases , to achieve the effect of slow release, good permeability, and good drug sustained release effect

Inactive Publication Date: 2014-05-07
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zheng Yajing et al. prepared natamycin microcapsules by complex coacervation method, and confirmed that it has good anti-photolysis effect (Zheng Yajing et al. Preparation and performance test of natamycin microcapsules. Pesticides 2012,51(4):267 -269), but the release rate of the microcapsules prepared by the complex coacervation method is faster, and the duration of effect in the soil is shorter, which is not suitable for effective control of soil-borne diseases for a longer period of time.

Method used

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  • Sterilizing microcapsule capable of preventing plant soil-borne diseases as well as preparation method and application method of suspending agent thereof
  • Sterilizing microcapsule capable of preventing plant soil-borne diseases as well as preparation method and application method of suspending agent thereof
  • Sterilizing microcapsule capable of preventing plant soil-borne diseases as well as preparation method and application method of suspending agent thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 microcapsule preparation process condition research and performance test

[0046] experiment method

[0047] (1) Experimental design

[0048] According to the results of the previous pre-experiment, select the mass ratio of NA mass to UF prepolymer (core-wall ratio), the molar ratio of formaldehyde to urea, the pH value of the reaction end point, and the curing reaction temperature that have a greater impact on the encapsulation efficiency of the microcapsules. Influencing factors, 3 levels are set for each factor, designed according to L9(34) orthogonal table, and the test results are evaluated by encapsulation rate. Orthogonal table design is shown in Table 1. Encapsulation efficiency determination method: measure the absorbance value of free NA in the NA microcapsule suspension at a wavelength of 303nm with a visible-ultraviolet spectrophotometer, through the standard curve method (see figure 1 ) to calculate its content, and calculate the encapsula...

Embodiment 2

[0071] The preparation of embodiment 2 microcapsule suspension

[0072] The microcapsule suspension prepared in Example 1 is left standing and discards different amounts of supernatant to obtain a microcapsule suspension with NA content of 20g / L and 60g / L, and then press the components of Table 4-5 and Mass ratio Weigh each component to make microcapsule suspension. The method is to weigh the anti-sedimentation agent first, add an appropriate amount of water to fully dissolve it, and make it into a paste, then add the weighed microcapsule suspension, and then add other ingredients, fully stir evenly under the condition of the mixer speed of 800-1000rpm, Natamycin microcapsule suspension (NACS).

[0073] Table 4 The mass ratio of each component of the bactericidal microcapsule suspension (1)

[0074]

[0075] Note: The microcapsule suspension contains urea-formaldehyde resin, the same below.

[0076] Table 5 The mass ratio of each component of the bactericidal microcapsul...

Embodiment 3

[0078] Embodiment 3 Microcapsule drug effect test

[0079] The test site is the vegetable field in Xiaofengying, Yanqing County, Beijing. The test set 18g / L microcapsule suspension prepared by in-situ polymerization method (NACS-1, see Table 4①) 111.11mL / m2 (effective dosage 2g / m2, the same below), 14g / L microcapsule suspension prepared by complex coacervation method (NACS-2, see Chinese patent: 201110388140.7, formula ② in Table 2) 142.86mL / m2, 1.4g / L NA concentrate 1428.57mL / m2, 50% carbendazim wettable powder 4g / m2 and no application control (CK) 4 treatments. The area of ​​each plot is 4m×2.5m=10m2, arranged in random blocks and repeated 3 times. On March 16, 2012, cabbage was sown, and the nursery field was sterilized with carbendazim before sowing, and on April 30, 2012, when it grew to 4-5 leaves, the disease-free plants were selected for transplanting. 5 days before transplanting, the day after transplanting, and 21 days after transplanting, apply the pesticide once...

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Abstract

The invention discloses a sterilizing microcapsule suspending agent capable of preventing plant soil-borne diseases and a preparation method. An active component of a core material of a microcapsule is natamycin and urea resin is used as a wall material; and the microcapsule is prepared by an in-situ polymerization method. The microcapsule can be used for preventing crop soil-borne fungal diseases, has the characteristics of slow releasing of the active component, long lasting period, wide sterilization spectrum, low utilization amount, good sterilization effect, uneasiness of obtaining resistance and the like, and has a very good development and application prospect.

Description

technical field [0001] The invention belongs to the field of biological pesticide processing and application, and in particular relates to a method for preparing and using natamycin microcapsules and suspending agents for preventing and controlling plant soil-borne diseases. Background technique [0002] Soil-borne fungal diseases have always been a major problem that plagues fruit and vegetable production, such as cabbage wilt, watermelon wilt, cucumber wilt, etc. These diseases can reduce yield by 20%-30% in mild cases, and reduce production by more than 50% in severe cases, or even disappear . For example, the annual occurrence area of ​​cabbage wilt increased by 6.5 times in Yanqing County, Beijing from 2002 to 2006, and the annual yield loss increased from 180,000 kg in 2002 to 1.37 million kg in 2006, and the cumulative annual yield loss reached 4.03 million kg. At present, the disease is rapidly developing and spreading, and the damage is increasing day by day. It ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01N25/28A01N25/04A01N43/90A01P3/00A01B77/00
Inventor 卢向阳刘伟成卢彩鸽郑雅婧张殿朋张涛涛
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES