JPH07238003A - Oleic acid salt insecticide and insecticidal method carried out by using the same - Google Patents

Abstract

PURPOSE:To obtain a fatty acid-based insecticide prepared by admixing an oleic acid salt with oleic acid itself, containing both the components especially in a specified ratio, having a remarkably high insecticidal effect, enabling reduc tion of the effective dosage, easy to use and advantageous from the viewpoint of the cost.. CONSTITUTION:This insecticide contains an oleic acid salt (a K salt or an Na salt is especially preferable) and oleic acid as the active components and the content of oleic acid is within a range of 1 to 40wt.%, preferably 5 to 20wt.% based on the content of the oleic acid salt. If a suitable acid component such as hydrochloric acid or acetic acid is further added to oleic acid, p remarkably high insecticidal effect can be obtained. This insecticide can control not only insects but wide-ranging terrestrial arthropods, especially a cockroach, a spider mites, an Aleyrodidae, etc. This insecticide is sprayed preferably in an amount of 150 to 500 L/10 a after diluting the active component with water to 0.2 to 2wt.%.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an oleate insecticide and an insecticidal method using the same. The insecticide in the present invention refers to not only insects but also a wide range of terrestrial arthropods for general control.

[0002]

BACKGROUND OF THE INVENTION The insecticidal activity of fatty acids such as oleic acid and salts thereof has been known for a long time and was widely used as an insecticide until the 1940s (Tattersfie).
ld and Gimingham, 1927. Annals of Applied Biology 1
4: 331-358). Although it was not used with the spread of chemically synthesized pesticides such as BHC and DDT after that, it has low human animal toxicity and persistence, has little effect on biota including natural enemies, and is resistant to target mites and insects. Since it has extremely excellent properties as compared with other chemical agents such as no chemicals, its value is being reviewed in recent years, and a new patent application for insecticides and acaricides has been filed (JP-A-48-96719). ,
JP-A-62-169703). However, the insecticides utilizing these fatty acids and fatty acid salts have a slightly weaker effect than many chemical agents that are currently generally used, and the amount of active ingredient required to obtain the same effect is large. ,
It has a problem in terms of control cost, and is not widely used even now, as social regulations on chemical pesticides are becoming stricter. Therefore, in order to compensate for those drawbacks, a method of adding various substances for the purpose of lowering the effective concentration of the insecticidal active ingredient has been devised. However, it is true that many of these additives are mixed with the active ingredient and formulated into a single liquid formulation because if they are mixed in the required amount in advance into the liquid concentrate, precipitation or solidification occurs. It was difficult. In addition, formulating them as separate agents not only increases packaging costs and transportation costs, but also necessitates mixing two agents at the time of spraying, thus improving workability at the site of use. Was sacrificed.

[0003]

The object of the present invention is to solve the above-mentioned problems of insecticides using fatty acid salts, that is, to reduce the effective dose while formulating as a single agent. It is to provide a fatty acid insecticide which is easy to use and is advantageous in terms of cost.

[0004]

[Means for Solving the Problems] In order to achieve such an object, the present inventors added various soluble compounds to a liquid formulation containing oleate to prepare a formulation,
The insecticidal activity was investigated. As a result, when oleic acid itself is added to oleate, and when they are present in a specific ratio, a remarkably higher insecticidal activity than that expected from the insecticidal effect of oleate or oleic acid itself is obtained. I found it. Furthermore, they have found that the addition of an appropriate acid component such as hydrochloric acid or acetic acid to oleate can achieve exactly the same effect, and completed the present invention.

That is, the first aspect of the present invention contains oleic acid salt and oleic acid as active ingredients, and the content of oleic acid is 1 to 40% of the content of oleic acid salt, preferably 5%.
It is an insecticide characterized by being in the range of up to 20%. Here, examples of the oleate include potassium salt and sodium salt. The second aspect of the present invention is an insecticidal method using the above insecticide.

The present invention will be described in detail below. Insecticide formulations containing oleate and oleic acid can be prepared by adding oleic acid itself to oleate, or by adding other acids to oleate, or in advance with a solvent such as ethanol. In dissolved oleic acid, or a mixture of oleic acid and other acids,
It can be obtained by mixing an aqueous solution of potassium hydroxide or sodium hydroxide in an amount less than the neutralization equivalent or other oleic acid with a base forming a salt.

Examples of the oleic acid salt include monovalent metal salts such as sodium and potassium, ammonium salts, methylamine salts, isopropylamine salts, amine salts such as diethanolamine salts, which form salts with oleic acid. Any basic substance that can be obtained can be used. Among them, sodium salts and potassium salts are most suitable in terms of easiness of preparation and effect.

When oleic acid itself is added as an acid, it is suitable to add 1 to 40%, preferably 5 to 20% of the oleate, and particularly 7 to 15% is most effective. When oleic acid itself is added as an acid in this way, the amount of oleic acid added and the content of oleic acid in the insecticide are the same. Therefore, if oleic acid is added at the above-mentioned ratio, the content of oleic acid in the insecticide is 1 to 40%, 5 to 20%, and 7 to 15% of the content of oleate, respectively.
It will be in the range of%. When the content of oleic acid deviates from the range of 1 to 40% of the content of oleate, the insecticidal effect remains the same as that of oleate alone, or conversely the activity decreases. Furthermore, as acids other than oleic acid, which show the same effect by producing oleic acid when added to oleate preparations, organic acids such as fatty acids having 1 to 20 carbon atoms and inorganic acids such as hydrochloric acid and sulfuric acid Examples thereof include acids, but the acidity is not limited thereto as long as the acidity is equal to or higher than that of oleic acid. The acid added here does not have to be a pure product, and an acid containing impurities such as edible vinegar or wood vinegar may be used. Regarding the amount when these acids are added instead of oleic acid, the amount of the oleic acid salt content and the oleic acid content in the solution when diluted is the above ratio, that is, hydrochloric acid, sulfuric acid, etc. For strong acids, the molar ratio of oleate is 1 to 40%, preferably 5 to 20%, more preferably 7 to 15%.
~ 80%, preferably 10-40%, more preferably 15-30
It is suitable to set it in the range of%. In terms of weight ratio, for example, for potassium oleate, 0.1-4.6 for hydrochloric acid.
%, Preferably 0.6 to 2.3%, more preferably 0.8 to
1.8%, 0.3-12.3% for sulfuric acid, preferably 1.5-6.1
%, More preferably 2.3 to 4.6%, 0.4 to 15 for acetic acid
%, Preferably 1.9 to 7.5%, more preferably 2.8 to
5.6% is appropriate.

The insecticide of the present invention can be prepared as a liquid agent by adding a solvent or additive such as water or ethanol to the above-mentioned oleate and acid, and is mixed with an auxiliary agent generally used for usual agrochemical formulations. Then, it may be prepared into a powder, wettable powder, emulsion or the like for use. The insecticide of the present invention is usually used as a liquid preparation. The content of the active ingredient (oleate + oleic acid) when prepared as a liquid agent can be arbitrarily set according to the dilution ratio at the time of use, but is 20 to 50
It is appropriate to set it as%.

The amount of the insecticide of the present invention to be sprayed is preferably such that the agent prepared by the above method is diluted with water to 0.2 to 2% of the active ingredient and then sprayed at 150 to 500 L per 10 are, but is not limited thereto. It is not something that will be done. The insecticide of the present invention is intended to control a wide range of terrestrial arthropods in general, but among these, plant parasitic mites and hemiptera insects, larvae of larvae of Lepidoptera / Coleoptera / Hymenoptera insects It is preferably used for small insects having weak chitination, and particularly preferably for aphids, spider mites and whitefly.

Next, the present invention will be described with reference to examples. However, the present invention is not limited to these examples.

[0012]

【Example】

[Example 1] Effect of oleic acid-added oleic acid solution on peach aphid Liquid oleic acid solution prepared by adding oleic acid to ethanol solution of potassium oleate and sodium oleate at a predetermined ratio (active ingredient = oleate + Oleic acid, 30%) was prepared and diluted 100 times with distilled water. As a control, oleic acid was also prepared as a 30% ethanol solution, which was diluted 100 times with distilled water and suspended. 2 mL of each drug solution, diameter 3 cm, height
Using a glass atomizer, it was sprayed on the green peach aphid colonies (30 to 50 individuals) on the Japanese radish seedlings (actual leaf 2 leaf stage) cultivated in a 10 cm glass tube. After spraying 25
After being left for 16 hours at 60 ° C and 60% humidity, the aphids were judged to be alive or dead. The experiment was repeated 5 times for each plot. As shown in Table 1, when oleic acid was added to oleate in the range of 5 to 20%, the result was higher than that of oleate alone and calculated from the insecticidal rate of oleic acid and oleate alone. It was revealed that the insecticidal effect was higher than expected value. Furthermore, oleic acid is added to oleic acid
When 10% was added, the insecticidal effect was equal to or higher than that of 0.6% oleate alone, that is, the amount of active ingredient (oleate + oleic acid) could be halved.

[0013]

[Table 1]

[Example 2] Effect of a solution prepared by adding an acid to oleic acid potassium salt on peach aphid was prepared by adding a predetermined amount of oleic acid, hydrochloric acid or acetic acid to a propylene glycol solution of potassium oleate. A liquid agent (active ingredient = potassium oleate + oleic acid, 30%) was diluted 100 times with distilled water. 2 mL of this drug solution
Green peach aphid colonies (30-〜) on radish seedlings (2-leaf stage of true leaf) cultivated in a glass tube with a diameter of 3 cm and a height of 10 cm
50 individuals) were sprayed using a glass atomizer. After spraying, the mixture was allowed to stand at 25 ° C and 60% humidity for 16 hours, and then the aphids were judged to be alive or dead. 5 experiments per ward
Repeated times. As shown in Table 2, it was revealed that addition of an acid to potassium oleate enhances the insecticidal effect of potassium oleate with any of the acids.

[0015]

[Table 2]

[0016]

[Examples of use] The liquid preparation of the present invention containing the mixture of potassium oleate and oleic acid shown in Table 3 as an active ingredient and the drug of Table 4 containing only potassium oleate as an active ingredient as a control were prepared. 100 times with tap water, 5 with contrast solution
Cucumber (four leaves) at the 5-7 leaf stage of true leaves, which was diluted 0-fold and cultivated in a glass house using a planter, had 50 per plant.
It was sprayed at a rate of mL. Immediately before and 1 day after spraying, the number of pre-marked cotton aphids on specific leaves was counted to determine the effect. The test was repeated 5 times. As a result, as shown in Table 5, the insecticide of the present invention showed an excellent control effect equal to or higher than that of the agent containing only potassium oleate as an active ingredient at a half dose.

[0017]

[Table 3]

[0018]

[Table 4]

[0019]

[Table 5]

[0020]

INDUSTRIAL APPLICABILITY According to the present invention, the efficacy of the fatty acid salt insecticide is enhanced, which makes it possible to provide an insecticide with high safety and ease of use at low cost.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Tsuchiya 6-2 Umegaoka, Midori-ku, Yokohama-shi, Kanagawa Prefecture, Japan Tobacco Inc. Plant Development Laboratory Yokohama Center (72) Inventor, Minoru Fujimori Midori-ku, Yokohama-shi, Kanagawa Prefecture Umegaoka 6-2 Japan Tobacco Inc. Plant Development Laboratory Yokohama Center

Claims (4)

[Claims] 1. An insecticide comprising oleic acid salt and oleic acid as active ingredients, wherein the content of oleic acid is in the range of 1 to 40% of the content of oleic acid salt. 2. The oleic acid content is in the range of 5 to 20% of the oleate content.
Insecticide described. 3. The insecticide according to claim 1, wherein the oleate is a potassium salt or a sodium salt. 4. An insecticidal method using the insecticide according to claim 1.