Fungicidal Mixtures

Abstract

Fungicidal mixtures comprising, as active components, 1) the triazolopyrimidine derivative of the formula I

Description

EXAMPLE 1

Activity Against Sheath Blight on Rice Caused by Corticium sasakii

Pots of rice plants of the cultivar “Tai-Nong 67” were sprayed to runoff point with an aqueous suspension having the concentration of active compound stated below. The next day, oat grains infected with Corticium sasakii were placed into the pots (in each case 5 grains per pot). The plants were then placed in a chamber at 26° C. and maximum atmospheric humidity. After 11 days, the sheath blight on the untreated but infected control plants had developed to such an extent that the infection could be determined visually in %.

TABLE A
Individual active compounds
		Concentration of active	Efficacy in %
		compound in the spray	of the untreated
Example	Active compound	liquor [ppm]	control
1	control	—	(85% infection)
	(untreated)
2	I	4	30
3	II (fluoxastrobin)	16	18
		1	0

TABLE B
Mixtures according to the invention
	Mixture of active compounds;		Calculated
Example	concentration; mixing ratio	Observed efficacy	efficacy*)
4	I + II	77	30
	4 + 1 ppm
	4:1
5	I + II	88	42
	4 + 16 ppm
	1:4
*)efficacy calculated using Colby's formula

EXAMPLE 2

Activity Against Peronospora of Gravevines Caused by Plasmopara viticola

Leaves of potted vines of the cultivar “Riesling” were sprayed to runoff point with an aqueous suspension having the concentration of active compound stated below. The next day, the undersides of the leaves were inoculated with an aqueous zoospore suspension of Plasmopara viticola. The grapevines were then initially placed in a water-vapor-saturated chamber at 24° C. for 48 hours and then in a greenhouse at 20-30° C. for 5 days. After this period of time, the plants were again placed in a humid chamber for 16 hours to promote sporangiophore eruption. The extent of the development of the disease on the undersides of the leaves was then determined visually.

TABLE C
Individual active compounds
		Concentration of active	Efficacy in %
		compound in the spray	of the untreated
Example	Active compound	liquor [ppm]	control
6	control	—	(89% infection)
	(untreated)
7	I	16	44
		4	21
8	II (fluoxastrobin)	16	55
		4	21

TABLE D
Mixtures according to the invention
	Mixture of active compounds;		Calculated
Example	concentration; mixing ratio	Observed efficacy	efficacy*)
9	I + II	100	56
	16 + 4 ppm
	4:1
10	I + II	94	38
	4 + 4 ppm
	1:1
11	I + II	100	65
	4 + 16 ppm
	1:4
*)efficacy calculated using Colby's formula

The test results show that the mixtures according to the invention are considerably more effective than had been predicted using Colby's formula.

Claims

1. A fungicidal mixture for controlling harmful fungi, which mixture comprises the triazolopyrimidine derivative of the formula I

2. The fungicidal mixture according to claim 1, comprising the compound of the formula I and the compound of the formula II in a weight ratio of from 100:1 to 1:100.

3. The composition comprising a liquid or solid carrier and a mixture according to claim 1 or 2.

4. A method for controlling harmful fungi which comprises treating the fungi, their habitat or the seeds, the soil or the plants to be protected against fungal attack with an effective amount of the compound I and the compound II according to claim 1.

5. The method according to claim 4, wherein the compounds I and II are applied simultaneously, that is jointly or separately, or in succession.

6. The method according to claims 4 and 5, wherein the compounds I and II or the mixtures are applied in an amount of from 5 g/ha to 1000 g/ha.

7. The method according to claims 4 and 5, wherein the compounds I and II or the mixtures are applied in an amount of from 1 to 300 g/100 kg of seed.

8. Seed comprising the mixture according to claim 1 or 2 in an amount of from 1 to 300 g/100 kg.

9. The use of the compounds I and II according to claim 1 for preparing a composition suitable for controlling harmful fungi.