JPH0699249B2 - Pest control agent - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pest control agent for controlling damage of agricultural products by pests.

[0002]

2. Description of the Related Art Conventionally, in order to prevent damage by pests and increase the yield rate of crops per unit area, more effective pesticides for crops have been used. Such pest control agents include, for example, organic synthetic agents called so-called new agricultural chemicals such as organophosphorus and carbamate agents.

[0003]

However, although these organic synthetic drugs are very effective in controlling pests, they are highly toxic to humans and animals due to their strong toxicity, and also to sprayed plants. Many of them also show phytotoxicity.

Therefore, there has been a long-felt need for a pest control agent which is low in toxicity and does not cause residual toxicity in foods and has a strong effect in controlling pests.

The present invention was devised in view of such circumstances, and it is an object of the present invention to provide a pest control agent which has little toxicity to humans and animals and has a strong control effect against pests. It is a thing.

[0006]

Means for Solving the Problems As a result of various studies on pest control methods other than organic synthetic agents, the present inventor has focused attention on the following cases. When making radish in the Hainan district of Shizuoka prefecture, when the beach sand that was once washed up on the beach was used as the soil for the radish field, no pests were generated and no spraying of pesticides was necessary. . Agricultural books of the Meiji era stated that by dissolving a paste of seaweed (Tsunomata) in water and spraying it over the fields, the outbreak of pests was prevented.

It is speculated that the cause of these pest control actions is to block the stigmas of the pests by suffocation by the stickiness of the seaweed paste and to repel the pests by specific components of the seaweeds.

[0008] Therefore, as a result of further tests and studies with reference to the above-mentioned cases, the present inventor has found that citric acid having a pest repellent action and boric acid having a low residual toxicity are mixed in a viscous carboxymethylcellulose solution. It was found that a pest control effect equal to or higher than the above can be obtained by the above.

The present invention has been made based on the above new findings of the present inventor, and is a pest characterized by containing citric acid and boric acid in a solution in which carboxymethyl cellulose is dissolved. It is a control agent.

Further, a butyl alcohol solution of paraoxybenzoate may be mixed through a surfactant for long-term storage, and a sorbitan fatty acid ester may be added for facilitating water dilution and spreading during spraying. Is also good.

[0011]

The pest control agent according to the present invention has the action of closing the stomata of the pest by suffocation of the carboxymethylcellulose solution and suffocating it by the stickiness of the carboxymethylcellulose solution, as well as the pest control itself by the acidity of citric acid. Although it has an action of repelling agricultural products, the most characteristic pest control action of the present invention is as follows.

That is, carboxymethyl cellulose is an artificial fiber and forms a three-dimensional network structure by the interaction of water molecules in an aqueous solution. Therefore, if citric acid and boric acid are mixed in carboxymethyl cellulose dissolved in a solution, those molecules will be mixed in the network of carboxymethyl cellulose, and the pest will not notice the mixing and eat carboxymethyl cellulose with them. As a result, the toxicity of boric acid causes death.

Unlike plant leaves and fruits, carboxymethyl cellulose has a very high content of cellulose,
When the pest eats it, it ingests more cellulose than necessary, and even if it loses its balance in the body, it leads to death.

[0014]

EXAMPLES Examples of the present invention will be shown below, but the present invention is not limited thereto.

In this embodiment, the manufacture is performed by the following process.

First, carboxymethyl cellulose (10 kg)
Is dissolved in water (500 kg), then butyl paraoxybenzoate (0.3 kg) is dissolved in methyl alcohol (1.923 kg), a surfactant is further added, and then both solutions are stirred and mixed, followed by citric acid (10 kg ), Boric acid (10 kg), and sorbitan fatty acid ester (3.224 kg). The ratio of these components (wt%) is as shown in Table 1 below.

[0017]

[Table 1]

Next, the components and component ratios of this embodiment will be described.

Carboxymethyl cellulose has a viscosity in an aqueous solution, and forms a three-dimensional network structure by interaction with water molecules. In the present invention, the viscosity and the three-dimensional network structure of carboxymethyl cellulose are used as described above, and it is preferable that the component ratio is somewhat high. However, on the other hand, if the viscosity is too strong, it is inconvenient at the time of spraying, so it is considered that about 2.0% is more preferable. Therefore, in this example, the component ratio of carboxymethyl cellulose was limited to 1.867% of the whole.

Citric acid is a substance that repels harmful insects due to its sour taste, but on the other hand, if it is added in a large amount, it also harms the plant itself, and its component ratio is 1 to 4% of the whole. Considered preferable. However, carboxymethylcellulose is a substance weak against acid, and it is necessary to suppress the total ratio with boric acid described below to at least 4.0%. Therefore, the citric acid component ratio is 1.86% of the total.
Only 7%.

Boric acid is a substance having a low persistence but a toxicity. In the present invention as well, the toxicity is utilized as described above, but on the other hand, since it is necessary to consider the effect on the human body, the component ratio is preferably within 2.0% which is the permissible range of the eye wash solution. Further, as described above, considering the ratio with the above citric acid from the point that carboxymethyl cellulose is weak against acid, the component ratio of boric acid is 1.867 of the whole.
%.

Butyl paraoxybenzoate is added when the insect pest control agent of the present invention is stored for a long period of time, but the standard of use as a preservative for fruits is within 0.0012%. As described below, in the present example, the component ratio of butyl paraoxybenzoate was 0.
Only 056%. Note that formalin, sorbic acid, or the like may be added instead of this butyl paraoxybenzoate.

Methanol is used for mixing the butyl paraoxybenzoate with the carboxymethyl cellulose aqueous solution, and the minimum amount of butyl paraoxybenzoate to be completely melted is required. However, considering the effect of methanol on agricultural products, it is considered that the minimum amount necessary for melting butyl paraoxybenzoate is sufficient. Therefore, the component ratio of methanol was limited to 0.359%.

The surfactant is used to dissolve butyl paraoxybenzoate when the aqueous carboxymethyl cellulose solution and the butyl alcohol paraoxybenzoate alcohol solution are mixed. Similar to the above-mentioned methanol, the minimum necessary amount is sufficient, and in consideration of the addition amount of butyl paraoxybenzoate, the component ratio was limited to 0.036% in this example.

The sorbitan fatty acid ester is added when it is necessary to make good spread on the agricultural products during spraying.
In addition, it is a very hydrophilic nonionic surfactant,
It also serves as an emulsifier when diluted with water. There is no problem in setting the component ratio to a certain degree as long as the spreading effect is improved. However, the minimum ratio at which the spreading effect can be obtained is sufficient in terms of cost. Therefore, in this embodiment, it is set to 0.602%.

Next, a test example of this embodiment as described above will be shown.

<Test Example 1> In a tea garden, the present example 10
The results obtained by diluting with 0 times water and spraying with a spraying amount of 500 l / 10a are shown. ◎ Mulberry white worms Before application, about 80% of the stems of tea had mulberry worms attached to it, but it became 100% dead 20 days after the application. ◎ Planthoppers, thrips Before spraying, they were attached to 2 leaves of 1 tea core at a rate of about 3 animals, but 6 hours after spraying, about 20% and about 80% dead one day later,
It became 100% dead one week later. ◎ Kanzawa Hadani was attached to about 5 out of 10 tea leaves before spraying, but about 80% died 3 days after spraying and 100% died 15 days after spraying again. . ◎ Tea Hamaki Before spraying, about 5% of all buds had 2 larvae per bud, and about 80% of them had rolled leaves.
In such cases, it was impossible to control with conventional pesticides,
Two to three days after spraying, 80% of the leaf-rolling larvae were killed, and the leaf-rolled larvae were 100% dead three days later.

<Test Example 2> The results obtained by diluting the present example 100 times with water and spraying it with a spraying amount of 150 l / 10a in a strawberry orchard in a vinyl house are shown. ◎ Night thief As a result of spraying 1 week after planting seedlings, 10 cm 2 days after spraying
He was dead at the rate of one animal per ^square. After that, no night thief was found. ◎ Brassica mosquito By spraying once within 1 week after vinyl coating and twice every 10 days thereafter, no occurrence of Brassica worm was observed for 1 month after that. ◎ Red mite As a result of spraying at intervals of about 10 days after planting of seedlings, no occurrence was observed.

[0029]

EFFECTS OF THE INVENTION The present invention has low toxicity and little chemical damage, as is clear from its components, but on the other hand, by utilizing the characteristics of carboxymethyl cellulose well, it is possible to obtain a stronger control effect against pests. Has become.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area A01N 37:04) (A01N 59/14 37:04 37:02)

Claims (2)

[Claims] 1. A pest control agent characterized by containing citric acid and boric acid in a solution in which carboxymethyl cellulose is dissolved. 2. A solution in which carboxymethyl cellulose is dissolved and an alcohol solution in which butyl paraoxybenzoate is dissolved in alcohol are mixed via a surfactant, and citric acid, boric acid and sorbitan are mixed in the mixed solution. A pest control agent comprising a fatty acid ester.