JPH07112962B2 - Plant filamentous fungus control agent - Google Patents

Description

TECHNICAL FIELD The present invention relates to a plant filamentous fungal disease control agent containing fusaric acid as an active ingredient.

[Conventional technology]

Fusaric acid is Fusarium oxysporum
oxysporum) is a mineral substance produced in the culture filtrate of several filamentous fungi, such as oxysporum), and the structure was determined to be 5-butylpicolinic acid from that extracted and purified using butyl acetate (Hidaka et al., 1971). Its mechanism of action is inhibition of catecholamine biosynthesis, that is, inhibition of dopamine β-hydroxylase and tyrosine hydroxylase, and it is used as a therapeutic drug for hypertension and Parkinson's disease. However, nothing is known about the antibacterial activity against plant pathogens.

[Problems to be solved by the invention]

An object of the present invention is to provide an excellent control agent by utilizing the preventive and therapeutic antibacterial activity against phytopathogenic bacteria possessed by fusaric acid.

[Means for solving problems]

As a result of diligent research, the present inventor has found that fusaric acid has preventive and therapeutic bactericidal activity against several plant pathogenic fungi. These plant pathogens include Pythium aphanidermatum (edson) Fitj, P. de b
aryanum Hessl), Phytophthora infestan
s), Sclerotinia sclerotiorum, White silkworm (Corticium rolfsii), Lumbago or Bacterial wilt disease (Rhizoctonia solani), Wilt's wilt disease (Verticilliu)
, which shows a remarkable bactericidal effect against the fungal and pathogenic fungi of algae, and also inhibits the sclerotia formation against basidiomycetes and ascomycetes The action is shown (Table 1 and Table 2).

The addition of fusaric acid leaked ninhydrin-positive substances and phenol / sulfuric acid-positive substances from the cells, and the bacterial weight was reduced. Therefore, it is speculated that this drug alters the permeability of cell membranes (No. 3). table).

When using fusaric acid as an active ingredient of the control agent, it may be used as it is without adding any other ingredient, but usually,
It is mixed with a solid carrier, a liquid carrier, a surfactant, and other auxiliaries for formulation to prepare wettable powders, powders, liquids and the like. These formulations contain 0.1-99.9% fusaric acid.

As the solid carrier, kaolin clay, atta-puljain clay, bentonite, acid clay, bilophyllite, talc, diatomaceous earth, calcite, corn cob powder, walnut shell powder, fine powder or particles of synthetic hydrous silicon oxide, etc. Can be used.

Water or the like can be used as the liquid carrier.

Surfactants used for emulsification, dispersion, wet spreading, etc. include alkyl sulfate ester salts, alkyl (aryl) sulfonates, dialkyl sulfosuccinates, polyoxyethylene alkyl aryl ether phosphate ester salts,
Anionic surfactants such as naphthalene sulfonic acid formalin condensates, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene block copolymers, nonionic surfactants such as sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters, etc. is there.

Pharmaceutical aids include lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CMC
(Carboxymethyl cellulose) and PAP (isopropyl acid phosphate) are used.

〔Example〕

Hereinafter, examples of the control agent of the present invention will be described. The parts used here are parts by weight.

Example 1 (wettable powder) 50 parts of fusaric acid, 35 parts of diatomaceous earth, 10 parts of white carbon,
A wettable powder having a fusaric acid content of 50% was obtained by mixing and pulverizing 3 parts of sodium lauryl sulfate and 2 parts of calcium ligninsulfonate.

Example 2 (Dust) 1 part of fusaric acid, 89 parts of kaolin clay, and 10 parts of talc were thoroughly mixed and pulverized to obtain a powder having a fusaric acid content of 1%.

Example 3 (solution) By mixing 50 parts of fusaric acid, 2 parts of sodium lauryl sulfate and 48 parts of water, a solvent having a fusaric acid content of 50% was obtained.

These preparations are used as they are or diluted with water etc. for foliage treatment or soil treatment. When used for soil treatment, the formulation is applied to the surface of the soil (mixed with the applied soil, if necessary) or irrigated.

Next, test examples of the control agent of the present invention will be described. The compounds used as comparative controls in each example are represented by the compound symbols shown in Table 4.

The bactericidal activity of the test compound measures the lesion length of the test plant,
The control values obtained as described below were used as an index for comparison.

Lesion length n days after drug treatment-lesion length at drug treatment = A Test Example 1 (bacterial bactericidal bactericidal activity test) 10 to 12 leaves of 18 to 20 leaf stage tobacco (variety: Burley 21) were inoculated with the fungus in a needle and placed in a humid chamber at 30 ° C. for 1 to 2 After the lesion was formed after a day, the solutions of fusaric acid and the control compound were sprayed so that the drug solution was sufficiently attached to the leaves. After spraying, it was returned to the humid chamber at 30 ° C., and after 3 days, the lesion length was measured to determine the control value. The results are shown in Table 5.

Test Example 2 (bacterial bactericidal bactericidal activity test) 10 to 12 leaves of 18 to 20 leaf stage tobacco (variety: Burley 21) are inoculated with the plague bacillus by needles and placed in a humid chamber at 20 ° C for 1 to 2 days After the lesions were formed later, the solutions of fusaric acid and the control compound were sprayed so that the drug solution adhered sufficiently to the leaf surface. After spraying, it was returned to a humid chamber at 20 ° C., and after 3 to 5 days, the lesion length was measured to determine the control value. The results are shown in Table 6.

As is clear from these results, fusaric acid has a remarkable bactericidal activity against tobacco bacillus and an excellent controlling effect against tobacco scab.

〔The invention's effect〕

As described above, fusaric acid has a bactericidal activity against phytopathogenic filamentous fungi, and the control agent of the present invention containing fusaric acid exhibits an excellent control effect against plant filamentous fungal diseases.

Claims (1)

[Claims] 1. A plant filamentous fungal disease controlling agent, which comprises fusaric acid as an active ingredient.