JPH04290804A - Insect pest controlling agent - Google Patents

Abstract

PURPOSE:To provide an insect pest-controlling agent having low toxicity against men and livestock, giving reduced residual toxicity and chemical damages for agricultural crops and further exhibiting stronger control activities against insect pests than those of conventional agents. CONSTITUTION:Citric acid and boric acid are added to a solution containing carboxymethyl cellulose to provide the insect pest controlling agent having the above-mentioned activities. In order to preserve the agent for a long period, the alcohol solution of butyl para-hydroxybenzoate may be dissolved in the carboxymethyl cellulose-containing solution in the presence of a surfactant, and further for the improvement in the dilution of the agent in water and in the adhesion of the agent to leaves on the spraying of the agent, a sorbitan fatty acid ester may be added. The insect pest controlling agent kills the insect pests by an action in which the carboxymethyl cellulose solution clogs the stomata of the insect pests due to the viscosity thereof to kill the insect pests by their asphyxiation, an insect pest-repellent action due to the acidic taste of the citric acid, the toxic action of the boric acid which is contained in the three-dimensional net structure of the carboxymethyl cellulose in the aqueous solution and which is eaten by the insect pests, etc.

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 to agricultural crops caused by pests and diseases.

0002

BACKGROUND OF THE INVENTION Conventionally, highly effective pest control agents for agricultural crops have been used to prevent damage caused by pests and to increase the yield per unit area of agricultural crops. Examples of such pest control agents include organic synthetic chemicals called new pesticides, such as organic phosphorus and carbamate chemicals.

0003

[Problems to be Solved by the Invention] However, although these organic synthetic drugs are highly effective in exterminating pests, they are highly toxic and therefore highly toxic to humans and animals, and they are also harmful to sprayed plants. Many of them also show drug damage.

[0004] For this reason, there has been a long-awaited desire for a pest control agent that is low in toxicity, free from concerns about residual toxicity in food, and which is highly effective in controlling pests.

[0005] The present invention was devised against the background of the above circumstances, and aims to provide a pest control agent that is almost non-toxic to humans and livestock and has a strong exterminating effect on pests and diseases. It is something.

[0006]

[Means for Solving the Problems] As a result of studying various pest control methods other than synthetic organic chemicals, the present inventor has particularly focused on the following example. ■ When growing daikon radish in the Shunnan district of Shizuoka Prefecture, when beach sand mixed with seaweed washed up on the beach was used as soil for the radish fields, there were no pests and there was no need to spray pesticides. Ta. ■ An agricultural book from the Meiji period stated that seaweed (tsunomata) glue dissolved in water could be sprayed on fields to prevent pests.

[0007] The causes of these pest control effects are presumed to be that the viscosity of the seaweed glue blocks the spiracles of the pests and suffocates them, and that the specific components of the seaweed repel the pests.

[0008] Therefore, the inventor of the present invention conducted further tests and research based on the above case, and found that citric acid, which has an insect repellent effect, and boric acid, which has low residual toxicity, were blended into a sticky carboxymethyl cellulose solution. It has been found that pest control effects equivalent to or greater than those described above can be obtained by using this method.

The present invention was made based on the new findings of the inventors as described above, and is characterized in that citric acid and boric acid are blended into a solution in which carboxymethylcellulose is dissolved. It is a pest control agent.

[0010] In addition, paraoxybenzoic acid butyl alcohol solution may be mixed with a surfactant for long-term storage, and sorbitan fatty acid ester may be added to facilitate water dilution and spreading during spraying. Also good.

[0011]

[Action] The pest control agent according to the present invention has the effect of blocking the spiracles of pests with the viscosity of the carboxymethyl cellulose solution and suffocating them to death, as well as the effect of suffocating the pests themselves with the sourness of citric acid, similar to the pest control method using seaweed described above. It has the effect of repelling pests from agricultural crops, and the most characteristic pest control effect of the present invention is as shown below.

That is, carboxymethylcellulose is an artificial fiber, and forms a three-dimensional network structure through interaction with water molecules in an aqueous solution, for example. Therefore, if citric acid and boric acid are mixed into carboxymethylcellulose dissolved in a solution, these molecules will be mixed into the network of carboxymethylcellulose, so pests will eat the carboxymethylcellulose whole without noticing the contamination. This results in death due to the toxicity of boric acid.

[0013] Also, unlike plant leaves and fruits, carboxymethyl cellulose has a very high cellulose content, so
When pests eat it, they ingest more cellulose than they need, which can disrupt the balance in their bodies and lead to death.

[0014]

[Examples] Examples of the present invention will be shown below, but the present invention is not limited thereto in any way.

[0015] In this example, the manufacturing process was as follows.

First, carboxymethylcellulose (10k
g) in water (500 kg), then butyl paraoxybenzoate (0.3 kg) was dissolved in methyl alcohol (1.
Then, after stirring and mixing both solutions, citric acid (10 kg), boric acid (10 kg), and sorbitan fatty acid ester (3.22 kg) were added.
4 kg) was blended. These component ratios (wt%) are as shown in Table 1 below.

[0017]

[Table 1]

Next, the components, component ratios, etc. of this example will be explained.

Carboxymethylcellulose has viscosity in an aqueous solution and forms a three-dimensional network structure due to interaction with water molecules. In the present invention, as described above, the viscosity and three-dimensional network structure of carboxymethylcellulose are utilized, and it is preferable that the component ratio is high to some extent. However, on the other hand, if the viscosity is too strong, it will be inconvenient during 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 total.

[0020] Citric acid is a substance that repels pests itself due to its sour taste, but on the other hand, it is also a substance that harms plants themselves if added in large amounts, and its component ratio is 1 to 4% of the total. considered preferable. However, carboxymethylcellulose is a substance that is sensitive to acids, and it is necessary to suppress the total ratio with boric acid, which will be described later, to at least 4.0%. Therefore, the component ratio of citric acid is 1 of the total.
．． It was kept at 867%.

[0021] Boric acid is a toxic substance, although its persistence is low. In the present invention, the toxicity is utilized as described above, but on the other hand, it is necessary to consider the effect on the human body, so the component ratio is preferably within 2.0%, which is the permissible range for eye wash liquids. . In addition, since carboxymethyl cellulose is sensitive to acids as mentioned above, the ratio of boric acid to citric acid is taken into consideration, and the overall component ratio of boric acid is 1.
It was kept at 867%.

[0022] Butyl paraoxybenzoate is added when the pest control agent of the present invention is to be stored for a long period of time, but the standard for its use as a preservative for fruits is within 0.0012%. As will be described later, in this example, the component ratio of butyl paraoxybenzoate was kept at 0.056% of the total, considering that it would be diluted 100 times and sprayed. Note that formalin, sorbic acid, etc. may be added instead of butyl paraoxybenzoate.

[0023] Methanol is used to mix the above-mentioned butyl paraoxybenzoate with the aqueous carboxymethyl cellulose solution, and the minimum amount required is enough to completely melt the butyl paraoxybenzoate. However, considering the influence of methanol on agricultural crops, it is considered that the minimum amount necessary to melt butyl paraoxybenzoate is sufficient as the component ratio. Therefore, the component ratio of methanol was kept at 0.359%.

The surfactant is used to dissolve butyl paraoxybenzoate when the aqueous carboxymethyl cellulose solution and butyl paraoxybenzoate alcohol solution are mixed. As with methanol, the minimum necessary amount is sufficient, and in consideration of the amount of butyl paraoxybenzoate added, the component ratio was kept at 0.036% in this example.

[0025] Sorbitan fatty acid ester is added when it is necessary to improve the spread on agricultural crops during spraying. It is also a highly hydrophilic nonionic surfactant,
It also acts as an emulsifier when diluted with water. There is no problem in setting the component ratio higher to some extent as long as the spreading effect is improved, but from a cost standpoint, the lowest ratio that can obtain the spreading effect is sufficient. Therefore, in this example, the content was set at 0.602%.

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

<Test Example 1> In a tea plantation, this example was
The results are shown after diluting with water 0 times and spraying at a spraying rate of 500l/10a. ◎ Before spraying mulberry scallops, about 80% of the tea tree trunks were covered with mulberry scallops, but 100% of them had died 20 days after spraying. ◎ Before spraying Thrips, there were about three planthoppers attached to one core and two leaves of tea, but about 20% died 6 hours after spraying, about 80% died one day later, and 100% died one week later. reached. ◎ Before spraying, about 60 Kanzawa spider mites were attached to 5 out of 10 tea leaves, but about 80% of them were killed 3 days after spraying, and 100% were killed when sprayed again 15 days later. . ◎ Before spraying Chahamaki, 5% of all buds were infested with larvae at a rate of about 2 larvae per bud, and about 80% of them had curled leaves. In such cases, it was impossible to control with conventional pesticides, but
Two to three days after spraying, 80% of the larvae that were rolling leaves died, and 100% of the larvae that were not rolling leaves died after 3 days.

<Test Example 2> In a strawberry garden in a vinyl greenhouse, this example was diluted 100 times with water, and 150 l/1
The results of spraying with a spraying amount of 0a are shown. ◎ As a result of spraying night bug seedlings one week after planting, 10c were sprayed two days after spraying.
One animal died per m2. After that, no night bugs were observed. ◎ By spraying once within one week after vinyl covering and twice every 10 days thereafter, no occurrence of oilflies was observed for one month thereafter. ◎ As a result of spraying at intervals of about 10 days after planting red mite seedlings, no occurrence of red mites was observed.

[0029]

[Effects of the Invention] As is clear from its ingredients, the present invention has low toxicity and little phytotoxicity, but on the other hand, it can effectively utilize the properties of carboxymethyl cellulose to obtain a more powerful extermination effect against pests. It has become.

Claims (2)

[Claims] 1. A pest control agent characterized in that citric acid and boric acid are blended into 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 added to the mixed solution. A pest control agent characterized by containing fatty acid ester.