DE2343829A1 - FUNGICIDES AGENT - Google Patents

Description

The invention relates to a mixture of fungicidally active compounds which are used as seed dressings in cereals, such as barley or oats, is of importance.

The compound 2,5-dimethylfuran-3-N-phenylcarboxamide Although it has good fungicidal activity against certain cereal diseases occurring in seeds, such as cereal blight (Ustilago nuda), but has only a minor effect on other diseases that develop in seeds, such as leaf streak disease in oats and barley (Pyrenophora avenae and Pyrenophora graminea). In addition to its narrow spectrum of activity, possesses the compound still has the further disadvantage of using it as a seed dressing that it is the Germination impaired, especially at relatively low ambient temperatures.

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It has now been shown that these disadvantages can be overcome by connecting to a second fungicidally active compound mixed. The invention therefore relates to fungicides which act as active ingredients

I. 2,5-dimethylfuran-3-N-phenylcarboxamide and

II. Either a methiocarbamate derivative or a thiuram disulfide derivative contain"

Preferred dithiocarbamate derivatives are metal-ethylene-1,2-bis (dithiocarbamate) derivatives, for example the manganese derivative (Maneb) or a mixed complex containing a zinc compound and Maneb (Mancozeb). The thiuram disulfide derivative is preferably tetramethylthiuram disulfide (thiram). That The ratio of the active ingredients I: II in the fungicidal agents should expediently be 1: 1 to 1:10, preferably 1 to 1 up to 1: 6 «

The fungicidal agents preferably also contain a liquid or solid carrier for the fungicidally active compounds. Particularly suitable formulations for the application seed dressings are dusts containing up to 90 wt .- ^ Gesant-V / irkstoff ο

To protect cereal seeds from infestation with fungal diseases, the seeds are usually mixed with the treated fungicidal agents according to the invention, in the usual amount for seed dressings of 1 to 4 kg of agent each kg of seeds.

example 1 Experiments on phytotoxicity

Barley seed var. Julia (a variety susceptible to chemical treatment) was used with Compound I alone as 50 ^C / O

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Seed dressings as well as treated with I and Maneb or Thiram in admixture. In each case the dose was Compound I 0.75, 0.50 or 0.25 g of active ingredient per kg of seed; when using the mixtures, the dose of maneb or thiram was 1.50 g / kg of seed »

Two seed plates containing non-sterilized clay were sown with about 100 treated seeds each and in a germination or growth chamber under the following conditions held:

15 hours a day without light at a temperature of 10 ⁰ G, then

9h daily with artificial light and at 16 ⁰ O ₀

The germination of the seeds was checked at intervals and the percentage germination inhibition 8, 10 and 16 days later the sowing in comparison with a control experiment (untreated) calculated. The results are summarized in Table I below} They show that the mixture of maneb or Thiram and I made a remarkable improvement in the number of seeds that germinate.

I. dose Tabel additive 1 * 10 16 days Treated Germinal 79 57 with r active ingredient / kg seed inhibitory 47 23 I + Maneb 1 8th 26th 25th 0.75 1.50 93 44 17th 0.50 1.50 62 16 4th I + thiram 0.25 1.50 29 0 0 0.75 1.50 77 38 18th 0.50 1.50 35 14th 7th 0.25 1.50 0 3 0 0.75 53 0.50 42 0.25 11

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Example 2

Fun gicide effectiveness

a) Field trials with Ustilaga nuda

Barley seeds (Sultan variety) grown naturally had been heavily infected with U.nuda, was treated with a dust containing compound I or mixtures I with maneozeb or pickled Thiram, total dose 3 g dust per kg seed The treated seed was split into 5 double fields in the spring

of 1 m each and the infestation with U _e nuda determined 97 days after sowing. The results are summarized in Table 2 below * They show that the activity of I against TJ.nuda is not influenced by mixing with Mancozeb.

Table 2

Treated dose reduction

with g / kg of seed fungal infection J6 I additive

I 1.00 100

0.75 100

I + Mancozeb 1.00 1.00 100

0.75 1.00 100

I + thiram 1.00 1.00 100

0.75 1.00 100

b) Experiments with Pyrenoftora avenae and Pyrenophora graminea

Infected oat or barley seeds were infected with a Pickled dusting agent containing the compound I or mixtures of I and maneb. The seeds were then placed on potato

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Planted out dextrose agar and incubated at 23 ° C. The development the fungal infection was observed after 7 and 10 days. The results are summarized in Table 3 below and show that with the mixtures a greatly improved Combating Pyrenophora diseases is achieved.

I. dose I. additive Tabel 3 avenae the Infection ^c ß> Treated Haneb g / kg of seed 1.0 reduction 10 P. jgrammea with I + Maneb - 1.0 P. 28 7th 10 days 1.0 1.0 7th 47 27 21 1.0 0.5 48 72 100 94 1.0 0.25 74 64 100 100 97 78. 100 100 100 100 100 100

Claims

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Claims (6)

Patent entitlements 1 »Fungicidal agent, containing as active ingredient I 2,5-dimethylfuran-3-N-phenylcarboxamide and II either a dithiocarbamate derivative or a thiuram disulfide derivative. 2. Fungicidal agent according to claim 1, characterized in that g e k e η η records that it is a metal ethylene 1,2-bis (dithiocarbamate) derivative as a dithiocarbamate derivative contains » 3. Fungicidal agent according to claim 1, characterized in that g e k e η η records that it contains tetramet hyIthiuram disulfide as a dhiuram disulfide derivative 4o fungicidal agent according to one of claims 1 to 3, characterized in that it contains the two active ingredients I and II in a ratio of 1: 1 to 1:10 contain 5. Fungicidal agent according to one of claims 1 to 4, in the form of dust, containing up to 90% by weight total active ingredient. 6. Use of the fungicidal agent according to claims 1 to 5 as a seed dressing, especially for barley and oats. 72XXII 4098 11/1165