DD218262A1 - FUNGICIDE BACTERICIDE MEDIUM COMBINATIONS - Google Patents

Abstract

The invention relates to advantageous mixtures based on known fungicidal and bactericidal agents for dressing potatoes. Its aim is to create improved mordants that enable the growth of healthy crops and a reduction in storage losses. The underlying object of finding optimized combinations of active substances by exploiting synergistic properties is achieved according to the invention by the fact that the fungicidal / bactericidal agent combinations N- (2,6-dimethylphenyl) -N- (2-methoxyacetyl) -alanine methyl ester, benzimidazol-2-yl- Carbamic acid esters, chloramphenicol and 2-bromo-2-nitropropane-1,3-diol in certain proportions as active ingredients.

Description

Title of the invention Fungicide-bactericidal combinations of drugs

Field of application of the invention

The invention relates to advantageous mixtures based on known fungicidal and bactericidal active ingredients for dressing potatoes.

Characteristic of the known technical solution

The increase and stabilization of potato yields as well as the improvement of potato quality are of great economic importance "With the introduction of new production methods, potato rotting and casserole diseases have become more important and lead to the development of chemical combating techniques." BURTH ¹ ua, reports (Nachr, -Bl _e Pflanzenschutz DDR ^ 6 (1982.). 10-13).

The recommended preparations _v contain known fungicides, especially benzimidazole derivatives; often will too; the combination with a bactericidal active ingredient, z "B, chloramphenicol (DD.78 423 and DD 84 958 as a supplementary patent, DD 107 204 and DD 110 423 as an additional patent, DD 130 427) or Bronopol (DD 133 885) proposed. The efficacy against fungal and bacterial storage rots is 60 to 70%, casseroles, blacklegs and Rhizoctonia solani infestation are reduced by 50 % »Another

2Q0HT.1982 O42i *) l

Improving the effectiveness of the pickling preparations and reducing the amount of funds used are therefore highly desirable. " , <

It is also known that metalaxyl can be used as a selective active ingredient in agents for controlling Phytophthora infestans in potatoes (CH 607 888); advantageous combinations with prior art fungicides are listed in DE-OS 25 091.

The aim of the invention is the development of improved pickling means for potatoes which enable the growth of healthy crops and a reduction in storage losses.

cleg essence of., invention

The invention is, based on looking the task optimized combination ^ hationen known fungicidal and bactericidal agents taking advantage of potentiating Eigenschaften.zu "It was .gefunden that V / irks toff combinations ^ consisting of D _s LcIJ-. (2 _s 6-Dimethylpheny 1) -N- (2 ^s -methoxyac ety 1) ~ aläninrae t hy 1-ester (I) (metalaxyl) and

(A) benzimidazole ^ 2-ylcarbamic acid <- methyl ester (II) (carbene ~~ dazim) and chloramphenicol (III) or

(B) benzimidazole-2-yl-carbamic acid "-methyl ester (II) and .2" bromo "2" -nitropropane-1,3-diol (IV) (bronopol)

eminently suitable for the control of fungal and bacterial pathogens in potato tubers are ₀ Surprisingly, the V / FFECTIVENESS the combinations significantly above the expected additive effect of the single components * "This effect was eynergistische corresponding to the formula of COLBY

E β X + Y - - "yJo"

determined ο

The middle combinations according to the invention exhibit a broad fungicidal and bactericidal activity against fungi from the group of the Oomycetes, Asco- and Basidiomycetes and suppress the development of pathogenic bacterial species, such as Erwinia spp, a main pathogen of leaves and blacklegs of the potato pickling of potatoes suitable, as losses caused by fungal and bacterial pathogens vermindert.und • the growth of healthy plants are conveyed _o the difference between the microbicidal activity and phytotoxicity is sufficiently large so that there is no damage to the crop, when used in the indicated concentration. The mass ratios of the active compounds D, LN.sup. (2,6-dimethylphenyl) -N.sup.- (2'-methoxyacetyl-alanine methyl ester (I), benzimidazol-2-yl-carbainic acid methyl ester (II), chloramphenicol (III) and 2-) Bromo-2-nitropropane-1,3-diol (IV) can be found in the combinations within the limits of

(A) 5: 25: 1 to 2: 100: 1

(B) 1: 5: 1 to 1: 50: 3

move,. · '

D, LK- (2,6-dimethylphenyl) -N- (2'-methoxyacetyl) -alanine methyl ester (I), benzimidazole-2-yl-carbamic acid methyl ester (II), chloramphenicol (III) and 2-bromo-2 ~ nitropropane ~ 1,3-diol (IV) are commercially available active ingredients. Their preparation is widely described in the literature.

Of the active compound combinations according to the invention, the formulations suitable for pickling preparations, such as, for example, wettable powders, can be prepared in a customary manner.

The application is carried out in a known manner, preferably immediately after harvesting or before planting of the potatoes in the spray or fine spray method. The application rates, based on the combination of active ingredients, are generally between 20 and 200 g / t potatoes Explanation of the synergistic effect of the agent combinations according to the invention,

Synergistic effects of the middle combinations in the mycelium growth gymnastic test of Phytophthora infestans

The inhibition of Mycelwachsturns is determined in an agar plate test ", a standard culture medium (based on Erbsendekokt) are functions of disk molding die.gewünschten concentrate of each agent is added _o the inoculation is done with mycelbewachsenen agar slants of the test fungus of 8 mm diameter * Growth inhibition is determined by measuring the radial growth rate and expressed as a percentage of 'the active substance''freecontrols', the incubation temperature is 20 ⁰ C ₉ the evaluation takes place after 7 days «

Medium · ζοηζ _φ .. growth-synergistic

/ "/ ug / ml / mung in% Effect n _s COLBY

I (known) 0.01 0.06 + 0 2 23 32 66 * - *> * + 9 1 m / II + -III (45 + 1 parts) J [known]. 0.2 · + 0 + 0 + 0 • 1 _p. 2, 2 15 + + + 16 II + ¹ IV (10 + 1 parts) "0.1 0.2 .6 f 17 23 14 I + (II, + III.) 0j02 58 I + (II + IV) 0.01-0.02 0.06 45 63 84

Beis £ iel_2

Synergistic effects of agent combinations / against storage rots in seed potatoes

Potatoes of the Astilla variety, which were heavily contaminated by naturally occurring fungal and bacterial infections, were each treated with 5 kg in the form of a Schlämtnbeize with Aufbrüheaufwandmengen of '20 ml with the individual means. The storage was carried out under practical conditions in the warehouse at temperatures of 2 to 10 ⁰ C and relative humidity between 70 to 90 %. After 3 months of storage, the rating was carried out with regard to occurred rots. Calculated was the mass fraction of sick tubers (as a percentage of the total potato mass) as well as the degree of efficiency (in percent rottenness prevention compared to the untreated control).

Average rate of application Rotroter synergistiin g / kg Kartof- lust in degrees in % shear Ef-

fei I (known) 0.01 + 0.12 Mass % _t fect n.COLBY II + III (45 + 1 parts) (known) 0.12 + 0.13 11.0 15 II + 'IV (10 + 1 parts) (known) 0.13 4 ^ 0 69 *** I ₊ (II ₊ III) 0.01 4.5 65 * - " I + (II + IV) 0.01 1.0   92 + 18 0.5 96 + 26 '

, Synergistic effects of agent combinations based on plant growth

40 cucumber pieces each of about 8 to 10 cc (variety: Bintje) with one bud each (eye) were stained 4 hours after artificial infection with Phytophthora infestans _s Fusarium app and Erwinia spp, dui'ch dipping with the means listed below The day after the application, the ocular plates were planted in sterilized compost in plastic trays and set up in the open »after 20 and 34 days, the number of accumulated plants was scored«,

medium

Konz, the brewing broth in %

Number of up-regulated, healthy running plants Effect shoots "in % n _e COIBY in% 'd.

Days 34 days total

synergistic effect η, COIBY

II -Kill (45 + 1 parts)

(known)

3.0

II + 'IV 3 _s 0. 32 (10 + 1 parts)

(known )

1+ (11 + 11I) .0.125 + 3.0 87

I + (II + IV) 6.125 + 3.0

82

89

+29; +40

79

+26; +31

+

+

Claims (2)

Erfindungsansprach Fungicide-bactericidal compositions for potato dressing, characterized in that they have a Wirkstoffababination of D, L ~ lT ~ (2,6-dimethylphenyl) ~ N- (2 '~. InethoxyacetyD-alanine methyl ester (I) and. (A) benzimidazole-2-yl-carbamic acid, methyl ester (II) and. Chloramphenicol (III) or (B) Benzimidazole ~ 2 ~ yl ~ carbamic acid methyl ester (II) and 2-bromo ~ 2 ~ nitropropane-1,3-diol (IV) contained in a mixture with conventional excipients Composition according to item 1, characterized in that the mixing ratio of D, L-N ~ (2,6-dimethylphenyl) -N "- (2'-methoxyacetyl-alanine methyl ester (I) to the combination active ingredients (II-IV). (A) I: II: III from 5:25:01 to 2: 100: 1 (B) I: II: IV 'is from 1: 5: 1 to 1: 50: 3 * Use of the preparations according to item 1, characterized in that they are used to combat the fungal and bacterial attack on potato tubers and to improve the health of accumulated plants,