JP4809552B2 - Plant protection paste - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a paste for preventing the decay of plants such as trees, and more particularly to a paste widely used for preventing infection of fruit trees and suppressing the decay of cuts of foliage plants.
[0002]
[Prior art]
Trees are infected with peanut fungus (Valsa ceratosperma) from the cuts of branches, trunks and branches, causing branch rot and trunk rot. Due to such infection, in the case of branch rot, pre-breaking symptoms occur, and in the case of trunk rot, browning of the bark and partial rot of the wood occur, and this is a serious problem especially for fruit trees. In the past, attempts have been made to fill cement in the depressions of trees to prevent infection. However, the cement has various problems such as poor adhesion to trees and peeling. As a method for solving these problems, Japanese Patent Application Laid-Open No. 11-155396 discloses a method in which a paste mixed with diatomaceous earth, cement, wood powder, and an antibacterial agent is coated on a depression or cut of a tree and then cured. Has been. Further, a synthetic resin such as urethane or vinyl chloride is added with a preservative added.
[0003]
[Problems to be solved by the invention]
However, cement and synthetic resin materials have insufficient adhesion to trees, and cannot be handled directly by hand, resulting in problems in workability and safety. Furthermore, in the case of a synthetic resin, it was not preferable in terms of environment. Therefore, a plant protection material that can be handled safely and easily, has excellent adhesion to trees, and can reliably prevent infection has been desired.
[0004]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventors have found that polysaccharides are excellent as pasting agents for antibacterial agents for preventing infection of trees, and have reached the present invention. That is, the present invention relates to an antibacterial agent comprising fine particles of a titanium oxide-based or zinc oxide-based optical semiconductor pasted with a polysaccharide having gelling ability or a polysaccharide mixture containing at least one polysaccharide having gelling ability. It is a paste for plant protection comprising .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
As the polysaccharide (including derivatives thereof) used as a pasting agent in the present invention, natural polysaccharides can be used, but from the viewpoint of imparting water resistance to the paste after coating, A polysaccharide mixture containing at least one polysaccharide having gelling ability is preferred. The polysaccharide having gelling ability is not particularly limited, and examples thereof include agar, alginic acid and salts thereof, carrageenan, konjac potato extract, locust bean gum / xanthan gum mixture, gellan gum and the like. Carrageenan is preferred from the viewpoint of stability over time.
[0006]
The polysaccharide having gelling ability referred to in the present invention includes polysaccharides that exhibit gelling ability by addition of a component such as a specific salt, etc. Polysaccharides that exhibit gelling ability by combination with other polysaccharides are also included. The addition of such a gelling polysaccharide improves the water resistance of the coated paste, and prevents the paste from peeling off or flowing out due to rain or water spray.
[0007]
The antibacterial agent contained in the paste of the present invention is not particularly limited as long as it can prevent infection of trees, but in terms of long-term stabilization of antibacterial performance, fine particles of inorganic semiconductors such as inorganic titanium dioxide and zinc oxide Is preferred. These photo-semiconductors are known to have photocatalytic action and antibacterial effect, but since they exist in the form of fine particles, they do not flow out due to rainfall or watering as long as they exist in the paste, and the antibacterial action is maintained. Is done.
[0008]
In addition, a coloring agent, a nutrient, a preservative, an inorganic filler, a humectant, etc. may be added and mixed suitably to the paste of this invention.
[0009]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
[0010]
(Example 1)
A paste was prepared with the following composition and filled into a tube.
Xanthan gum 0.5% by mass
Titanium oxide optical semiconductor powder 1.0% by mass
Glycerin 15.0% by mass
Silica powder 20.0% by mass
Sodium benzoate 0.5% by mass
Water 63.0% by mass
The obtained paste was applied to the cuts of the apple branch with a finger and compared with an untreated cut. The paste could be easily and uniformly applied to the entire cut with a finger. After confirming the condition of the cut after 3 months, the cut with this paste was found to be slightly outflowed against the untreated cut, but there was no abnormality in the cut itself. It was. In addition, after the paste was prepared, changes in the hardness and separation of the paste were confirmed for the tubes stored at room temperature for 6 months, but no changes were observed and the coating could be carried out smoothly.
[0011]
(Example 2)
A paste was prepared with the following composition and filled into a tube.
Carrageenan 1.0% by mass
Titanium oxide optical semiconductor powder 1.0% by mass
Glycerin 20.0% by mass
Silica powder 20.0% by mass
Sodium benzoate 0.5% by mass
57.5% by weight of water
The obtained paste was applied with fingers to the cuts of apple branches in the same manner as in Example 1 and compared with the untreated cuts. The paste could be easily and uniformly applied to the entire cut with a finger. When the condition of the cut after 3 months was confirmed, no outflow of the paste was observed in the cut to which this paste was applied, and no abnormality was found in the cut itself in response to the occurrence of corrosion in the untreated cut. In addition, after the paste was prepared, changes in the hardness and separation of the paste were confirmed for the tubes stored at room temperature for 6 months, but no changes were observed and the coating could be carried out smoothly.
[0012]
【The invention's effect】
Since the paste for plant protection of the present invention uses polysaccharides (including derivatives thereof) as a pasting agent, it can be safely and easily coated on the peeled-off portions and cuts of trees, and polysaccharides are natural products. Therefore, since it is excellent in affinity with the tree structure and has good adhesiveness with the tree, infection of the tree can be surely prevented. Furthermore, since the oxygen permeability and moisture permeability are maintained through the coating agent even after the paste is coated, an optimum environment for the tree can be maintained.

Claims (1)

Plant protection comprising an antibacterial agent comprising fine particles of a titanium oxide-based or zinc oxide-based optical semiconductor pasted with a polysaccharide having gelling ability or a polysaccharide mixture containing at least one polysaccharide having gelling ability For paste.