DE1182466B - Soil treatment agent for combating mixed fungal infections - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school Kl .: AOIn

German KL: 451-9 / 02

Number: 1182466

File number: F 32432IV a / 451

Filing date: October 28, 1960

Opening day: November 26, 1964

The present invention relates to agents for soil treatment and fungal control Plant diseases caused by mixed infections.

It is known that p-Dimethylaminophenyldiazosulfonic acid (especially in the form of the sodium salt) and their derivatives listed in detail below as well as quinone-oxime-benzoyl-hydrazone are excellent are effective fungicides (compare e.g. the German Auslegeschriften 1028 828, 1014 373 and 1001 854). The active ingredients mentioned are compounds of the following constitution :

Soil treatment agents for control
mixed fungal infections

Applicant:

Paint factories Bayer Aktiengesellschaft,

Leverkusen

Named as inventor:

Dr. Paul-Ernst Frohberger,

Burscheid (District Düsseldorf),

Dr. Ewald Urbschat, Cologne-Mülheim

Quinone oxime benzoyl hydrazone (COBH)

N = N-SO ₃ Na II

H ₃ C

p-Dimethylaminophenyl-diazosulfonate sodium

(German interpretation)

The following fungicidally active substances have been mentioned above and are described below as derivatives of the p-Dimethylaminophenyl-diazosulfonic acid means:

H ₃ C _x _

p-Dimethylaminophenyl hydrazine sulfonate

NH ₂ -

p-aminobenzene azo sulfonate

NH-NH-SO ₃ HV
p-aminic phenyl hydrazine sulfonate

CH ₃ -CO-NH- / VN = N-SO ₃ Na VI

p-acetylaminoazobenzene sulfonate

The compounds mentioned are particularly useful as seed dressings and soil treatment agents of seedling and root diseases caused by soil fungi. In some cases, they develop an effectiveness that is achieved when the same amount of active ingredient is used cannot be achieved with any other known comparable preparation. This high potency comes mainly against phycomycetes Genera Pythium, Aphanomyces and Phytophthora come into their own. For seedling or root diseases, the z. B. caused by the mushroom genera Rhizoctonia or Fusarium or seed-borne fungi such as Phoma or Botrytis play a major role in the development of these However, the fungicidal effect of the preparations mentioned is unsatisfactory.

Since you can often not foresee which fungal pathogens in the individual cultivated plants the infection in the various soils and under the respective weather conditions cause fungicides based on the above-mentioned active ingredients, which are only effective against a few Mushroom genera are highly effective, but are not sufficiently effective for others the control of phytopathogenic plant diseases appear unreliable.

It has now been found that the described uncertainty has largely been eliminated and also mixed infections, which have been caused by different genera of the mushrooms mentioned, successfully can be combated if the compounds in question are combined with pentachloronitrobenzene (PCNB) or tetramethylthiuram disulfide (TMTD). The spectrum of activity of such combination products is compared to the

409 729/407

the individual components significantly expanded. The weak effectiveness of preparations I to VI against Rhizoctonia is mainly balanced by the addition of pentachloronitrobenzene, while one the lack of phycomycete effect of the last-mentioned compound by adding one of the items I to VI listed preparations can significantly increase. Pythium applies to soil-dwelling fungi and Rhizoctonia as the genera causing the greatest economic damage and their Combating for this reason is above all of the utmost importance.

Tetramethylthiuram disulfide has a relatively broad spectrum of activity, but is satisfactory in terms of it Efficacy against Phycomycetes not. The combination with one of those mentioned under I to VI Preparations leads to a means that, in addition to a diverse fungicidal potency, has a pronounced Shows excellent activity against Phycomycetes.

When using the combination according to the invention '-0 nation preparations an optimal effect is achieved if one of the preparations mentioned under I to VI and pentachloronitrobenzene or tetramethylthiuram disulfide in the ratio of 1:19 to 1: 1 is included.

These mixed preparations can of course also be used together with inert materials, preparation auxiliaries and other crop protection agents, such as Fungicides, insecticides, nematicides or soil structure improvers and fertilizers, for use come. They are formulated and provided in the form of litter, dust or spray Granulates, powders, pastes, suspensions, emulsions and real solutions.

The following example explains the invention in more detail:

example

Vegetation trials in the greenhouse
at temperatures around 20 ° C

Seeds:

Marrow peas.

Floor:

Frustorfer standard earth, sterilized.

a) Not inoculated.

b) Inoculated with Pytium ultimum and Rhizoctonia solani (mixed infection).

Application of the preparations
as a soil treatment agent

40

Serial
No. preparation Active ingredient
concentration
in the ground
in ppm number
Plant
100 U
3 weeks
the end
a ; esunder
en off
peas
after
seed
b 1 untreated - 92 0 2 II 25th 93 7th 3 PCNB 100 87 0 4th TMTD 100 91 32 5 II + PCNB 20 + 80 93 86 6th II + TMTD 20 + 80 94 64 7th IV 50 89 5 8th IV + PCNB 33 + 67 91 86 9 IV + TMTD 33 + 67 92 66 10 V 50 90 2 11 V + PCNB 33 + 67 90 83 12th V + TMTD 33 + 67 92 65 13th I. 100 88 8th 14th I + PCNB 50 + 50 91 80 15th I + TMTD 50 + 50 90 71 16 III 25th 90 4th 17th III + PCNB 5 + 95 88 53 18th III + TMTD 5 + 95 92 51

Claims (1)

Claim: Soil treatment compositions for combating mixed fungal infections, containing mixtures from firstly pentachloronitrobenzene or tetramethylthiuram disulfide and secondly from p-dimethylaminophenyldiazosulfonic acid, their salts, their simple derivatives or quinone-oxime-benzoylhydrazone in a ratio of 19: 1 to 1: 1. Considered publications:
German patent specification No. 753 076:
German Auslegeschriften Nos. 1 028 828, 1 014 373; News sheet for the German plant protection service, 1956, p. 209. 409 729/407 11.64 ö Bundesdruckerei Berlin