DD279788A3 - MEANS FOR CONTROLLING PHYTOPATHOGENIC MUSHROOMS ON WINTER WHEAT - Google Patents

Abstract

The invention relates to means for combating phytopathogenic fungi containing combinations of the active ingredients propiconazole and aldimorph in the ratio 10: 1 and 1:10.

Description

Field of application of the invention

The invention relates to new active agents for controlling phytopathogenic fungi, which have an improved action even in fungicide resistance and their use in agriculture and forestry and horticulture.

Characteristic of the known technical solutions

Despite the development of modern, systemic fungicides, fungal diseases of crops still cause high crop losses. One cause is the rapid development of fungicide resistance. Furthermore, it can be observed that the spectrum of action of fungicides does not always sufficiently detect the mushroom stresses that occur. N-alkylmorpholines are known as fungicides of great importance in practical terms (DE 1164152, DE 1198125, DD 140412). A major disadvantage of N-alkylmorpholines is their narrow spectrum of activity, which limits the use primarily on the control of powdery mildew fungi and in phytotoxic effects.

Triazole fungicides are known as fungicides with a broad spectrum of activity and a high fungicidal potency, such as. B. propiconazole (DE 257'560). A significant disadvantage of these fungicides is the rapid development of fungicide resistance which limits the use of these fungicides. The listed disadvantages justify the further search for new ways to improve fungicide preparations.

Aim of the invention

The object of the invention is to develop new, more effective means of combating phytopathogenic fungi with improved performance, which will be effective even when fungicide resistance occurs.

Explanation of the essence of the invention

The invention has for its object to seek by the use of known active ingredients based on triazoles and N-alkylmorpholines agents with improved activity, effectiveness in fungicide resistance, broadened spectrum of activity, reduced phytotoxicity and reduced application rates. This object is achieved in that in drug combinations usual formulation

Propiconazole (component A)

and Aidimorph (component B) is used.

Surprisingly, an existing on a synergistic effect increase in fungicidal activity was found, which allows a reduction in the application rates for improving the initial effect. The combinations according to the invention have activity when fungicide resistance has occurred and reduce the risk of the formation of resistant fungus strains. A further advantage is that due to the reduced risk of phytotoxicity, a broad use of wheat can take place, occurring on plants or parts of plants phytopathogenic fungi are combated.

Due to the systemic properties of both components, new growing parts of plants are also protected from infestation. The advantage of the agents according to the invention consists in the extension of the spectrum of activity compared to the individual components, in particular the effect on pests such as Fusarium spp "Pseudocercosporella spp, Septoria spp., Typhula spp. and grain rust is being extended.

Particular advantages in the application of the inventive compositions arise, due to reduced drug application rates, from a lower environmental impact and reduced residue levels in the crop.

Thus, the agents according to the invention represent a further development of the prior art.

The advantageous effect of these compositions according to the invention can be achieved if the expenditure of component A:

Component B in the ratio 10: 1 to 1:10 is carried out.

To achieve an advantageous effect for practice, components A and B can be used either as combination partners in formulations or in tank mixes.

Compositions according to the invention contain between 0.1 and 98% by weight of active ingredients in addition to the customary solid and / or liquid carriers and additives, as well as surface-active compounds. Formulations such as solutions, emulsion concentrates, wettable powders, granules, microcapsules, etc. may be prepared in conventional manner.

The application of the combinations according to the invention is carried out in a known manner, for. As diving, pouring, spraying, spraying, etc., directly on the phytopathogenic fungi or on their habitat. In this case, application rates depending on the specific application of 0.1 to 2kg / ha are used.

embodiments

The selected embodiments are intended to illustrate the invention without limiting it.

Example 1:

Wheat plants are grown at one leaf stage with a strain of Erysiphe graminis DC f. sp. tritici Marchai infected and treated after 24 hours with selected agents according to the invention (brewing rate 10OOI / ha). The fungicidal action of the test equipment is shown in Table 1. The fungicidal efficiency was determined from the score on the degree of infestation. The results make it clear that the wheat powdery mildew can be combated very well with the agents according to the invention and a clear synergistic effect is achieved.

Table 1

Determination of the synergistic effect of the propiconazole and aldimorph-based agents according to the invention

variant Wirkstoffkonz. efficiency (Ppm). (%) propiconazole 8th 100 + Aldimorph 50 propiconazole 4 85 + Aldimorph 25 propiconazole 8th 55 propiconazole 4 15 aldimorph 50 20 aldimorph 25 10

Example 2:

The composition according to the invention was applied to winter wheat under field conditions in the plot experiment. The treatment took place at the beginning of the powdery mildew. To illustrate the advantageous effect of the agents according to the invention, the efficacy was used (Table 2). From Table 2 it can be seen that with the inventive agent based on propiconazole and aldimorph (yield) of 11% were achieved significantly.

Table 2

Yield effectiveness of the agent according to the invention on the basis of propiconazole and aldimorph on winter wheat (x of 3 variants)

Variant rate of increase

krj o. I / ha (%)

Propiconazole 0.125

+ Aldimorph +0.331 11

Propiconazole 0.125 4

Aldimorph 0.331 0

Example 3:

The agent according to the invention was used on winter wheat under practical conditions. The treatment took place at the beginning of the powdery mildew. The beneficial effect of the agents according to the invention can be assessed by the fungicidal efficiency against wheat powdery mildew. Table 3 illustrates the synergistic effect of the combination according to the invention with the active substances propiconazole and aldimorph. In this experiment, no phytotoxic effects were detected.

Table 3

Fungicidal action of the agent of the invention based on propiconazole and aldimorph on winter wheat

variant application rate Efficiency (%) 8.7. kg or I / ha 21.6. 86 propiconazole 0,125 65 + Aldimorph +0.331 77 propiconazole 0.063 S5 + Aldimorph +0.166 50 propiconazole 0,125 18 50 propiconazole 0.063 10 14 aldimorph 0.331 35 0 aldimorph 0.166 0

Example 4:

The propiconazole-aldimorph-based agent of the present invention was subjected to a phytotoxicity test under greenhouse conditions. The agent according to the invention and the comparison agents based on propiconazole and aldimorph were used at normal, double, five and ten times the application rate per ha of potted winter wheat plants. The destruction of the leaf area was scored and shown in Table 4.

The composition of the invention shows excellent plant compatibility.

Table 4

Phytotoxic effects of the agent of the invention based on propiconazole and aldimorph and the comparison agent on winter wheat

variant (N) application rate destroyed leaf surface (kg or I / ha) (%) propiconazole (2n) 0.063 + Aldimorph (5n) +0.331 0 (10n) 0 (N) 8th (2n) 35 propiconazole (5n) 0,250 0 (10n) 0 (N) 3 (2n) 3 aldimorph (5n) 0.662 10 (1ON) 65 100 100

Example 5:

The propiconazole-aldimorph-based agent of the present invention has been used against powdery mildew with removable sensitivity to propiconazole. The agent according to the invention showed an excellent fungicidal action even after repeated use over a längeien period without a decrease in the efficiency against powdery mildew.

Examples:

Influence of the agents according to the invention on the yield in winter wheat and the action against diseases (field trials in the field)

variant earnings Powdery mildew Efficiency in% stainless sick dt / ha (22 attempts) Septoria units (22 verse) orkrankung (2 verse) (14Vers.)

untreated Component "A + B (1:10) Component ²¹ A + B (1: 6.3)

62.4 67.5 66.5

42.7 44.6

44.0 39.0

Legend:

1 amount of active ingredient per ha

2 amount of active ingredient per ha

59g 460g

-4- 279 78S

Example 7:

The active substances aldimorph and propiconazole were individually sprayed or in mixture after formulation as emulsion concentrate dripping wet on about 10 cm large plants of winter wheat. After the spray coating had dried on, the plants were inoculated by dusting with conidia of the powdery cereal powdery mildew. 7 to 14 days after the symptom development was scored, after which the efficiency (% infection inhibition) and the synergistic effect according to COLBY was calculated.

Table 7

Determination of the synergistic effect of the agents based on aldimorph and propiconazole according to the invention

variant Wirkstoffkonz. Efficiency% synergism against real to COLGY Powdery mildew ppm on winter wheat Aldimorph (B) 1 2 Aldimorph (B) 2 3 Propiconazole (A) 5 29 Propiconazole (A) 6 34 Propiconazole (A) 8th 52 Propiconazole (A) 10 75 A + B 5 + 1 54 23.6 A + B 6 + 2 58 22.0 A + B 8 + 2 76 22.6 A + B 10 + 2 99 23.3

Claims (4)

1. A composition for controlling phytopathogenic fungi on winter wheat, characterized in that it contains as active ingredients a combination of Propiconai.ol (A) and Aidimorph (B) in a ratio of 10: 1 to 1:10 and customary formulation auxiliaries. 2. Composition according to item 1, characterized in that the combination of components A and B takes place either as a partner in formulations or in tank mixes. 3. Composition according to item 1 ... 2, characterized in that the combinations contain the components A and B between 0.1 and 98 wt .-%. 4. A method for controlling phytopathogenic fungi, characterized in that the combinations of components A and B according Pkt. 1 ... 4 on phytopathogenic fungi or their habitat with application rates of 0.1 to 2 kg of active ingredients / ha are used.