CH637266A5 - FUNGICIDE SUSPENSION WITH ULTRA-RESTRICTED VOLUME. - Google Patents

Description

The invention relates to a fungicide suspension of fungicides soluble in water or petroleum products, such as e.g. the methyl o-phenylene bistiophanate.

Many pesticides and in particular the fungicides that are insoluble in water or oil are applied to the crops in the form of concentrated suspensions. In the form of such an aqueous solution or a water suspension or emulsion, z. B. 400-50001 / ha.

The agents which are conditioned according to the invention to a limited volume are used in an amount of about 8 to 151 / ha and the agents which are conditioned in “ultra-restricted volume” are used only about 0.5 to 6 l / ha.

This reduction in volume brings great savings in terms of time, labor and equipment, so that the costs per hectare treated decrease and the efficiency per hectare / hour increases.

In many cases, even the biological effectiveness of the products that are conditioned to an ultra-limited volume is greater than that of the usually conditioned pesticides (emulsions, dispersible powders). The complete replacement of water with a medium containing hydrocarbons (an oil or a solvent mixture) eliminates the disadvantage that some organic substances have a fungicidal effect, including methylthiophanate,

40 examples

1. A 33 percent suspension of methylthiophanate (90% conc.) Is prepared under the above-mentioned conditions, in a petroleum fraction, from which 98% by volume distills to 300 ° C., with the addition of 2 to 5% of a nonionic

45 see surface active agents (nonylphenol type, ethoxylated with 3 moles of ethylene oxide) and from 2 to 5% bentonite (montmorylonite type), organophylized by the absorption of a cationic surface-active substance from the aliphatic amine class with a C14-C18 carbon

50 hydrogen-containing radical.

2. Under the same conditions, 90% conc. Methyl thiophanate a 33 percent suspension in a petroleum fraction, of which 98 vol.% Distilled to 300 ° C., with the addition of 2 to 5% of a nonionic top

55 surface active agents (type isooctyl alcohol with 6 moles of ethylene oxide, ethoxylated) and from 2 to 5% of a stabilizing agent (bentonite, type Bravaisit), organophylized by absorption of a cationic surface substance from the class of aliphatic amines with a C14-CI8

60 hydrocarbon radical.

3. Under the same preparation conditions, 90% conc. Methylthiophanat a 33 percent suspension in a petroleum fraction from which 98 vol .-% to 330 ° C distilled, with 2 to 5% of a cationic surface

65 active agents of the aliphatic amine type with a C14-C18 radical and 2 to 5% organophylized bentonite (type Ilit) are added. The surface tension of the products from the examples above be

3rd

637 266

carries 29-33 dynes / cm. An advantage of the compositions according to the present invention is that they are stable at low temperatures (down to -15 ° C.), that they are distributed well on the leaves and that they have reduced volatility.

The compositions of the above examples were also tested for their phytotoxicity under greenhouse conditions. The experiments were repeated 3 times and carried out with a 3-fold overdosed amount of active ingredient in order to achieve a sufficient safety margin under field conditions.

Potato, corn, wheat, vine, sunflower, beet, bean, tomato, lettuce and cucumber plants were grown in greenhouses and sprayed at the 5 to 6 leaf stage. Corn, wheat and sunflowers were sprayed at the 2-4 leaf stage. The treatment was carried out with a back apparatus with a modified motor, so that small amounts of substance could be applied to the 10m2 area. Some of the results achieved are shown in the 1st table.

Table 1

Phytotoxicity of the products from Examples 1-3

Culture composition

Example 1 Example 2 Example 3

wheat

0

0

0

Corn

0

0

+

sunflowers

0

0

+

Potatoes

0

0

+

Beets

0

0

-

Beans

0

+ + +

+ + +

tomatoes

0

0

+

Cucumbers

0

0

-

salad

0

0

-

grapevine

0

0

-

Significance of the results after 24 and 72 hours of treatment: 0: without phytotoxicity; +: weak symptoms; + +: moderate symptoms; + + +: strong symptoms.

The products are therefore not phytotoxic for wheat even in triple doses. The phytotoxic effects are also of no practical importance for potatoes, beets, cucumbers, lettuce and grapevines. The phytotoxicity was also tested under field conditions:

I. In the case of wheat, the effect of the composition in combating the leaf disease of the stem and ears has been tested, and on the flour (Erysiphe graminis f. Sp. Tritici), on brown rust (Puccinia recondita) and the harvest. The tests were repeated 4 times on a parcelle of 40 m2. 3 treatments with the Arimitsn device were carried out in the phases of straw collection in the bellows and ear appearances. The tests were carried out for the Bezostaia variety at ICPP-Bucharest and for the Dacia variety at the Livada investigation station. The phytotoxicity and the leaf and ear diseases were assessed on the 0-6 scale and after production. As a comparative product i5 the Japanese Topsin ULV was used.

II. The grapevine products (Sclerotinia fuckeliana) have been tested on the vine. The 4 treatments (with the Arimitsn back pump) were done in the subsequent development phases of the plant; 1)

2o after flowering, 2) when the grapes were the size of a pea, 3) when ripe, 4) after ripening for the Chasselas d'oré variety. The trials followed at ICPP-Bucharest and at the Iasi winegrowing station. The plot contained 6 sticks between 2 supports. The notations er-25 followed for all grapes on the 0-6 scale.

III. For the sugar beet, 3 treatments were carried out to control the Cercosphora beticola.

30 was used. The parcel was 20 m2. The assessment of leaf attack was made on the 0-6 scale.

IV. 3 treatments with the Arimitsn apparatus were carried out on the beans, so that the observation of the

35 effect on colet streak lindemuthianum and Pseudomonas phaseolicola was possible. The plots were 10 m2. For all experiments, the data obtained were statistically processed with the analysis of variance (t and F test), and the limit difference (DL) was calculated.

40

1st example

The composition of Example 1 (MT 207) was applied in a dose of 3 l / ha for the control of wheat leaf disease. The results achieved are summarized in Table 45 2.

Table 2

Combating wheat diseases with the composition of Example 1

Formula dose kg flour attack rust attack blackening product

Active ingredient / ha Bucharest Livada Bucharest attack Livada tionq / ha

Livada

Example 1 1 0.08 36.4 8.79 2 52.7

Topsin ULV 1 0.42 34.3 8.46 1.1 52.4

Untreated - 3.63 67.3 14.32 4.3 42.6

DL 5% -5 q / ha DL 1% -6.6 q / ha DL 0.1% -8.6 q / ha

The attack on foliage and ear diseases, particularly in Bucharest, is very large,

Combat data underline the effectiveness of rust attack and blackening of ears.

the formula of Example 1. The reduction in flour as a result, the production increases by about 1000 kg / ha.

637 266

4th

Table 3

Control of the grapevine gray mold with the composition according to example 1

Formula dose kg gray mold grape attack flour

Active ingredient / ha Bucharest Iasi leaves Iasi

Example 1 1.6 4.05 74.82 21.01

Topsin ULV 1.6 2.25 88.74 28.09

Untreated - 9.47 99.35 29.88

With regard to gray mold control, the rest has a good effectiveness and is weak in Iasi.

Composition of Example 1, in a quantity of 4.51 / ha. In this last locality it is possible that the grape attack in the first plant development - the existence of a resistant form of fungi for the black

development phase decreased (Table 3). is effectiveness in the composition according to Example 1 and

The very strong attack of 1976 showed that it is not guilty of the standard product.

composition examined under these conditions in Buka-

Table 4

Cercospora - control of sugar beet with the composition according to Example 1

formula

Dose kg

Attack

Beet production

Kollett and Blätterpr

Active ingredient / ha frequency

T / ha

%

T / ha

%

example 1

0.21

3.51

75.4

120.8

45.5

137.9

Topsin ULV

0.21

3.5

74.7

119.8

44.7

135.4

Untreated

-

100

62.4

100

33.0

100

DL

5%

2.36

5.73

4.75

1 %

3.27

7.93

4.58

0.1%

4.56

10.95

9.08

With regard to the control of cercospora in sugar beets, the composition from Example 1 in a dose of only 0.71 / ha (Table 4) gave good results. The very good effectiveness of this formula for controlling cercospora ensures a very large increase in production.

Table 5

Combating wheat leaf disease with the composition according to Example 2

formula

Dose kg

E. graminis attack

P. graminis

Cl. herbarum

Product

Active ingredient / ha

attack

Attack q / ha

Bucharest

Livada

Bucharest

Example 2

1.6

0.46

48.6

8.8

1.2

45.6

Topsin ULV

1.6

0.42

34.3

8.46

1.1

52.4

Untreated

-

3.63

67.3

14.32

4.3

42.6

DL

5%

4.2

1% 6.3

0.1% 10.1

The composition according to Example 2 has a good protective effect of the wheat plants against flouring, rusting and blackening of ears.

Table 6

Control of the grapevine gray mold with the composition according to example 2

Formula dose kg S. fuckeliana attack & necator production

Active ingredient / ha Bucharest Iasi attack Iasi kg / stick

Example 2 1.6 3.49 83.15 12.36 3.25

Topsin ULV 1.6 2.25 88.74 28.09 3.75

Untreated - 6.47 99.35 29.88 2.27

2nd example

35 The formula according to Example 1 was tested for the fight against wheat leaf disease in Bucharest and in Livada (Table 5).

5

637 266

With regard to gray mold (Scelerotinia fuckeliana) in the vine, the composition according to the second example, used in an amount of 4.51 / ha, reduced the grape attack more than the composition according to example 1 (table 6).

In this case too, the reduction in gray mold attack is remarkable, especially in Bucharest. In Iasi is

Table 7

Control of cercospora in sugar beet with the composition according to Example 2

formula

Dose kg

Attack

Beet production

Leaves and collett

Active ingredient / ha frequency

T / ha

%

production

T / ha%

Example 2

0.21

4.68

79.6

127.6

42.6 129.1

Topsin ULV

0.21

3.51

74.7

119.7

44.7 135.4

Untreated

-

100

62.4

100

33.0. 100

DL

5%

2.36

5.73

4.75

1 %

3.27

7.93

6.58

0.1%

4.52

10.95

4.08

it is possible that the effectiveness has decreased due to the appearance of some new breeds.

The composition according to Example 1 is also effective for controlling flour (Uncinula necator). As a treatment result, grape production increases by 25 to 30%.

The Cercospora beticola is a harmful disease in sugar beets, which can be easily combated with the composition according to Example 2 at a dose of 0.71 / ha (Table 7). The results achieved with this disease control are excellent, both in terms of attack reduction and production growth (27.6% more than if untreated). In general, the results achieved with this composition are very good.

3rd example

25 The composition according to Example 3 was also tested for the control of wheat leaf disease.

With a dose of 41 / ha a satisfactory control of flour and ear diseases has been achieved (Table 8).

30th

Table 8

Combating wheat diseases with the composition according to Example 3

formula

Dose kg of active ingredient / ha

E. graminis attack on the leaves

Fusarium attack on the ears

Example 3 Topsin ULV Untreated

2.3

1.29

5.8

5.6 2.3 15.8

The results achieved show a somewhat lower effectiveness than with the standard product. However, they are very good compared to the untreated wheat, especially in the case of ear diseases.

As this results in the course of the experiments based on the 45 different phytopatogen agent numbers, the composition according to the invention has been shown to be effective and safe in use.

s

Claims (7)

637 266 PATENT CLAIMS 1. Fungicide suspension of fungicides which are insoluble in water or in petroleum products and have an ultra-restricted volume, characterized in that they contain a petroleum fraction from which at least 98% by volume distill to 300 ° C. with the addition of 2 to 5% of a nonionic surface-active agent and 2 to 5% bentonite, which is organophylized by the absorption of a cationic surfactant from the class of the C, 4-Ci8 aliphatic amines. 2. Fungicide suspension according to claim 1, characterized in that the fungicide is methyl-o-phenylene-bisthio-phanate of the formula S 0 * » -NH-C-NH-C-OCH- -NH-ONH-C-OCH, "H 3 S O is. 3. Fungicide suspension according to claim 1, characterized in that the nonionic surfactant is an isooctyl alcohol which is ethoxylated with 6 moles of ethylene oxide. 4. Fungicide suspension according to claim 1, characterized in that the nonionic surfactant is a nonylphenol which is ethoxylated with 3 moles of ethylene oxide. 5. Fungicide suspension according to claim 1, characterized in that the bentonite is montmorylonite. 6. Fungicide suspension according to claim 1, characterized in that the bentonite is bravaisite. 7. Fungicide suspension according to claim 1, characterized in that the bentonite is Ilite. decompose in the presence of water. At the same time, because of the reduction in the surface tension of the dispersion medium compared to water, a better distribution of the active ingredient on the plant is obtained. s To further improve the distribution, the compositions also contain a surface-active substance and a suspension stabilizer. The very fine dispersion of the solid active substance, which must have values between 1 and 5 n (excellent 1-3 | i), which can be achieved with coloid mills, are responsible for the good biological effectiveness. Fungicides of this type in the form of concentrated suspensions make plant treatment possible in amounts of 3 to 101 / ha. The fungicide compositions with ultra-restricted vois lumen, according to the present invention, eliminates the abovementioned disadvantages by conditioning the active ingredient, which may be methylthiophanate, as a suspension in a hydrocarbon-containing medium, preferably a petroleum fraction. A suspension stabilizer is added to the suspension (e.g. 2 to 5% organophylated alumina), 2 to 5% of a dispersing agent which is a nonionic surfactant of the poly-ethoxylated alcohol or alkylphenol type and a cationic surfactant made from Class of C14-C18 25 aliphatic amines. The content of active ingredient is about 20-35% by weight. The hydrocarbon-containing medium used in accordance with this invention is an inexpensive, non-phytotoxic product, namely a petroleum fraction from which at least 30 98 vol% to 300 ° C distill. The active ingredient suspension according to the present invention is prepared by adding the surface active ingredient to the carrier liquid with vigorous stirring in a turbo stirrer, after which the stabilizer and finally the active ingredient are added. After this pre-homogenization, a second homogenization phase follows by dispersing and finely grinding the solid material in a suitable mill, preferably in a coloid mill, down to a particle size of less than 5 nm.