DD243632B1 - AGENTS FOR THE CONTROL OF PHYTOPATHOGENIC BACTERIA AND MUSHROOMS - Google Patents

Abstract

Compositions for controlling phytophatogenic bacteria and fungi in pomiculture, horticulture, agriculture and ornamental and meadow woody plants comprise a nitroalkanol having the general formula (I> <IMAGE> in which R is hydrogen orhydroxyalkyl; R' is hydrogen, chlorine, bromine orhydroxyalkyl and R'' is hydrogen, alkyl or trichloromethyl, and an alkyl morpholine.

Description

in which

R is hydrogen or hydroxyalkyl

R 'is hydrogen, chlorine, bromine or hydroxyalkyl and

R "are hydrogen, alkyl or trichloromethyl

characterized in that the agent additionally contains alkylmorpholines.

2. Composition according to claim 1, characterized in that it is the preferred alkylmorpholine is a mixture of positionally isomeric N-Alkyldimethylmorpholine having an average chain length of C ₁₂ -C ₁₈ (aldimorph).

3. Composition according to claim 1, characterized in that the ratio BronopokAlkylmorpholin can preferably be from 10: 1 to 1: 1.

Field of application of the invention

The invention relates to microbicidal active substances, their formulation, combination or tank mixture for controlling bacteria and fungi in orchards and horticulture, in ornamental plants and in hallway wood The erfmdungsgemaßen funds before, during or after the growing season of the respective crops, shrubs or Geholze to combat bacterial or fungal diseases

Characteristic of the known technical solutions

Bactericides that enable a rapid control of diseases in the orchards, act specifically and their application no toxicological concerns exist, so far lack on a global scale Baktosen that caused by insects, rain splash , Bird or treatment measures often very rapidly epidemic in the stock or territory can spread today among the most dangerous fruit diseases While fighting bacterial rot in the storage of potatoes and cabbage species as bactericides chloramphenicol (DDR-WP 78423 and DDR-WP 84958 as a supplementary patent, GDR -WP 107204 and DDR-WP 110423 as an additional patent) or Bronopol (DDR-WP 133885) were used, found these drugs for toxicological reasons or insufficient efficacy in fruit production is not widespread

It is known that 2-bromo-2-mtropropane-1,3-diol (Bronopol) was proposed for controlling Erwinia amylovora on apples and pears and Xanthomonas malvacearum on cotton (British Patent 1193954). Due to the insufficient effect, Bronopol was found in the following period (CROSSE, JE "Prospects for the use of bactericides for the control of bacterial disease" 6 Brit Insect & Fungicid Conf 1971 in Brighton, Proceedings 1971, 694 705, TREE ₁ LH "Report on the Third International Fire Brigade Meeting in Bordeaux, 12 to 16 September 1983, Mitt the Obstbauversuchsringes Alten Land, Jork39 [1984] 1, p 12 17) was not widespread and was not mentioned in the relevant literature (BEYME, D and SCHAEFER, HJ, possibilities of diagnosis and control of fire blight on pome fruit 'Diss, AdL 1976) Initial starting points for a specific fight against the fire blaze resulted from the use of the quaternary ammonium compound benzalkonium chloride, which was used for bleeding in Crategus and other Ziergeholzen or for Sekundarbfutenabtotung in fruit growing is suitable (DDR-WP 269902) and thus excludes the most important possibility of infection for fire blight With the use of benzalkonium chloride, it is not possible to maintain the functionality of the bleeding or / and kill bacterial pathogens in the wood

Object of the invention

The invention aims to prevent or combat bacterial diseases of fruits and perennials and crops during the growing season as well as their spread by blood infection or care measures. At the same time it is intended to combine the bactericidal action with a fungicidal and thereby extend the application possibilities Means sufficient to be plant-contractual and still allow a fight against bacteria in the affected Geholzen

Explanation of the essence of the invention

It has been found that combinations or tank mixtures of nitroalkanols of the general formula I

R 'Й "! I

R - G - CH - OH

NO ₂

in which

R is hydrogen or hydroxyalkyl,

R 'represents hydrogen, chlorine, bromine or hydroxyalkyl and

R "is hydrogen, alkyl or trichloromethyl

are, with fungicides from the group alkylmorpholines, which are used to combat powdery mildew fungi (DDR-WP 140412) are used, complement each other not only in their spectrum of activity. Surprisingly, it has been found that combinations or tank mixtures of nitroalkanols of the general formula I with alkylmorpholines give synergistic effects with regard to the bactericidal action.

The active compound combinations of the invention over the known from the prior art single active substances have the advantage that the otherwise difficult to combat bacterial diseases of the fruit trees can be combated without the crops such. B. apples are damaged. This makes it possible to fight also the pathogen in the orchard. The active compound combinations or tank mixtures according to the invention thus represent a valuable enrichment of the art.

The application of the active compound combinations is expediently carried out in the preparation or application forms customary for fungicides or bactericides, ie solutions, emulsions, suspensions or else concentrates which, with the addition of liquid and / or solid carriers or diluents with the addition of surface-active substances and others Formulation aids can be prepared and diluted with water for use. The application form depends on the intended use, but in any case it has to ensure a fine distribution of the substances.

The preparation is carried out in a conventional manner by mixing, milling or solution process.

A convenient application is also the tank mix. Here, the formulated to preparations with different active ingredient content individual components are combined shortly before their application in the container of the application device or diluted together with the required amount of water. In addition, a common application of the combination or tank mixture according to the invention with other agrochemicals is possible.

The following examples illustrate the invention without limiting it:

Example 1: 200 flower clusters of Cotoneaster were infected with an exciter suspension of 10 ⁹ germs / ml. The flower tufts were externally sterilized and monitored by means of nutrient medium for infection with Erwinia amylovora. Compared to the untreated control (Pg11) Bronopol 80WP (PgI 2), aldimorph 662 g / l (PgI 3) and the tank mix of test element 2 + 3 (Pgl4) were used.

Table 1

Prevention of floral infection after contamination with Erwinia amylovora η = 200

pgi Application rate / ha infected flowers degree of infestation tuft 1 - 199 99.5 2 1500 g 105 52.5 3 150g 196 98.0 4 1 500 g + 82 41.0 150g

According to the calculation method of COLBY (Weeds 15, 1967,1, p. 20-22), the synergism can be calculated according to the following formula:

"1 - 100

X ₁ = degree of infection of compound A with the dose ρ

Y ₁ = degree of infection of compound B with the dose q

E ₁ = expected infestation after application of compound A + B with doses ρ + q Er = determined infestation after application of compound A + B with doses ρ + q.

If E ₁ > E _R , then there is a synergism.

If E, = Er, then the effect is additive.

If E ₁ <E _R , the effect is antagonistic.

In the present example, E ₁ -E _R = + 10.45, ie there is synergism.

Example 2: One-year shoots of cotoneaster were contaminated with a pathogen suspension of 10 ⁹ germs / ml and serologically tested after 10 days for infection by Erwinia amylovora. Compared to the untreated control (PgM) Bronopol 80WP (PgI 2), aldimorph 662g / l (PgI 3) and the tank mix of test element 2 + 3 (PgI4) were used.

Table 2

Prevention of instinctual infection after contamination with Erwinia amylovora η = 100

pgi Application rate / ha infected shoots 1 - 85 CSI 1500 g 27 3 150g 80 4 1 500 g + 7 E, -E _R = + 14 150g There is a synergism!

Example 3 To combat Erwinia amylovora in the wood of infected pear trees, the truncated shoots, lying on soil, were treated with the tank mixture of Bronopol 80 WP and Aldimorph 662 g / l (PgI 3). The results are compared to the untreated control (PgID and Bronopol alone) (n = 60).

pgi Application rate / ha Number of samples with Er infestation reason winia amylovora 1 - 54 90.0% CM 1500 g 25 41.5% 3 1 500 g + 11 21.0% 150g

Example 4:

Fifty year old shoots of the Breuhahn apple variety on the tree were infected with an Erwinia amylovora pathogen suspension. After one week, the infected shoots (PgI 1 -untreated control) with Bronopol 80WP became 60 kg / ha (PgI 2), with aldimorph 662 g / l at an application rate of 7.5 kg / ha and the tank mix of PgI. 2 + PgI. 3 treated. Two weeks after infection, the samples were cut and serologically tested for Erwinia amylovora infection.

PGI. Application rate / ha Number of samples with Erwinia amylovora 1 42 2 60 kg 18 3 7.5 kg 40 4 60 kg + 7.5 kg 3 E ₁ -E _R = + 4,2 There is a synergism!

Example 5:

The experimental setup was carried out as in Example 3. The cut shoots of contaminated apple trees were compared to the untreated control (PgI.1), with tank mixes from Bronopol 80WP 7 500 g / ha with 7 500 g / ha aldimorph 662 g / l (PgI. 2); with 7500g / ha tridemorph 763g / l (Pgl.3), with 7500g / ha fenpropimorph 750g / l (PgI.4), with 7500g / ha trimorphamide 200g / l (PgI.5) and the single preparations (PgI.2-6 ) at the appropriate rates (n = 60)

Prüfglieder Number of samples with TM with Bronopol synergism Erwinia amylovora - E ₁ -E _n individual preparations 1 Lunbeh. control 53 0 - 2. Aldimorph 39 0 + 12,7 3. Tridemorph 31 5 + 10,9 4. Fenpropimorph 31 - + 10,9 5. Trimorphamide 21 + 2.4 6. Bronopol 35 -

Example 6:

In the agar diffusion test the effect of the tank mix of Bronopol 80WP 1500g / ha + aldimorph 662g / l was determined at a rate of 750g / ha on the growth of phytopathogenic bacteria.

Pathogen diameter d. Hemm zones in mm

Erwiniaamylovora 26

Pseudomonassyringaep.v. tomato 21

Corynebacterium michiganense pv

 Miehiganense 26

The experiment shows that besides Erwinia species also other important bacterial diseases can be controlled.

Example 7:

In the plate test, the mycelium growth of selected fungal pathogens was determined after treatment with different bronopol morpholine tank mixes.

^{Variant Conc} - ^% Nectria Cytospora Botrytis Phytophthora

galligena personata cinerea cactorum

Bronopol 80 WP + о ~ І ~

Aldimorph 662g / I 0.02 + + + + + + _{+ + +}

Bronopol 80 WP + 0.1

Tridemorph763g / I 0.02 + + + + + + _{+ + +}

Bronopol 80 WP + 0.1

Fenpropimorph750g / I 0.02 + + + + + + _{+ + +}

Bronopol 80 WP + 0.1

Fademorph20 0.02 + _{+ + + +}

Bronopol 80 WP + 0.1

Fademorph20 0.05 + + + + + + ₊

Legend

very good effect + + +

no effect

Example 8

Carrot slices were inoculated with the causative agent Agrobacterium tumefaciens. After 3.5 and 10 days was scored. The inhibition of bacterial growth after 10 days is shown in the table:

Preparation concentration inhibition% synerg. effect

to COLBY

FL 373 (A) 0.1% 60

Falimorph (B) 0.05% 40

A + B 0.1% + 0.05% 90 +14

Example 9

Potato halves were mixed with the causative agent Erwinia carotovora subsp. treated atroseptica and scored after 5 days.

Preparation concentration inhibition% synerg. effect

to COLBY

FL 373 (A) 0.1% 30

Falloporph (B) 0.05% 25

A + B 0.1% + 0.05% 90 + 42.5

Example 10

Potato halves were treated with the causative agent Corynebacterium sepodenicum and scored after 10 days.

Preparation concentration inhibition% synerg. effect

to COLBY

FL 373 (A) 0.1% 70

Falloporph (B) 0.05% 45

A + B 0.1% + 0.05% 90 + 6.5

Claims (1)

1. A composition for controlling phytopathogenic bacteria and fungi in fruit and horticulture, agriculture and ornamental and corridor trees, with an agent based on nitroalkanols of the formula I. ψ R " RC-CH-OH
NO ₂