PL198183B1 - Fungicide in the form of concentrated aqueous solution - Google Patents

Abstract

A fungicide in the form of a concentrated aqueous suspension containing sulfur as a biologically active substance, as well as known dispersants, wetting agents, freezing point lowering agents, antifoaming agents, mineral carriers, bactericides and thickening agents, characterized in that it contains dimethyl sulfoxide in the amount of 0.5 - 2% by weight introduced together with highly refined paraffin type mineral oil in the amount of 0.5 - 6% by weight.

Description

Description of the invention

The subject of the invention is a fungicide in the form of a concentrated aqueous suspension containing sulfur as a biologically active substance, as well as known dispersants, wetting agents, ethylene or propylene glycol, a mineral carrier and thickening agents.

There are known powdered fungicides which, when mixed with water, are used for spraying plants. These agents are inconvenient to use because when preparing the mixture with water, they dusty intensely contaminating the environment and poisoning the people operating the sprayers.

Concentrated aqueous suspensions are more modern preparations than wettable powders, however, they pose many difficulties in production. It is difficult to prepare a well-adherent, effective, stable and non-sedimenting aqueous suspension on the plant to be sprayed, which can be stored for at least two years. It involves spontaneous processes aimed at destroying the developed internal structure, mainly sedimentation and flocculation processes, which, among other things, worsens the biological effectiveness of the preparation.

In order to prevent sedimentation of solid particles, the degree of their fragmentation should be maximized, but then the tendency to flocculation of primary and fragmented particles increases, which favors the sedimentation process.

In order to counteract this unfavorable phenomenon, surfactants and other adjuvants are used that improve the stability of fungicides in the form of a concentrated suspension.

Additionally, in order to improve the adhesion of the fungicide to the sprayed plants, mineral oil can be added, which, however, increases the difficulty of obtaining a physically stable agent, as well as its viscosity. It is known to use various diluents such as, for example, dimethylsulfoxide (DMSO) to lower the viscosity.

As surfactants, dispersants and wetting agents are used, such as lignin sulfonates (Borresperse NA or CA), formaldehyde condensation products of arylsulfonic acids (Wettol D 1, NNO Dispersant) and non-ionic adducts of ethylene oxide and alkylphenols (Rokafenol N6 or 8) and ionic derivatives of ethoxylated 2 , 4,6-tristrylphenol (Soprophor 4D 348). Other auxiliaries are mineral carriers such as synthetic silica (HDK, Arsil), kaolin or aluminosilicates, thickeners such as polysaccharides fermentation products (Rhodopol, Kelzan) and bactericides (Metatin K604).

Known fungicides in the form of concentrated aqueous suspensions may also contain antifoams such as silicone polymers (Rhodersil 426R) and freezing point depressants such as ethylene or propylene glycol.

The use of known agents to increase adhesion to fungicides for spraying plants in the form of concentrated sulfur-containing aqueous suspensions led to an increase in their viscosity.

Unexpectedly, it turned out that the addition of sulfur-containing fungicide in the form of a concentrated aqueous suspension, the addition of dimethylsulfoxide in the amount of 0.5 - 2% by weight and of highly refined mineral oil of the paraffin type in the amount of 0.5 - 6% by weight causes a synergistic effect, improving biological effectiveness. measure up to 3 times.

The fungicidal agent in the form of a concentrated aqueous suspension according to the invention contains sulfur as an active ingredient, moreover, known dispersants, wetting agents, a freezing point depressant, an antifoam agent, a mineral carrier, as well as bactericides and thickeners. In addition, the composition according to the invention contains dimethylsulfoxide in an amount of 0.5-2% by weight and mineral oil in an amount of 0.5-6% by weight.

The following can be used as dispersants and wetting agents according to the invention: lignin sulphonates such as Borresperse NA or CA, formaldehyde condensation products of arylsulphonic acids such as Wettol Dl or NNO dispersant and / or non-ionic adducts of ethylene oxide and alkylphenols such as Rokafenol N-6 or Rokafenol N- 8 and ethoxylated 2,4,6-tristrylphenol derivatives.

The mineral carrier may be synthetic silica such as Arsil or Wacker HDK.

Bacterial fermentation products of polysaccharides such as Kelzan or Rhodopol can be used as thickeners.

In addition, the agent of the invention may contain antifoams from the group of silicone polymers such as Silipian and Rhodersil 426R, antifreeze agents such as ethylene or propylene glycol, and a bactericide such as Metatin K604.

PL 198 183 B1

The compositions according to the invention are more effective on plants infected with the fungus, despite their use in small amounts, than the known sulfur-containing fungicides.

The fungicide according to the invention is obtained by mixing the carrier, dimethylsulfoxide (DMSO) and mineral oil with a dispersant, antifoam, antifoam agent dissolved in water beforehand.

The biologically active substance, sulfur, is added to the mixture prepared in this way, and the whole is ground in a bead mill. The mixture thus obtained is then stabilized by adding a thickening agent and, optionally, a bactericide. The preparation is in the form of a liquid concentrated aqueous suspension, homogeneous during long-term storage, from which, after dilution with water, a fungicidal spray liquid used in plant protection is prepared.

Example 1 illustrates the preparation of the agent of the invention.

P r z x l a d I.

The following ingredients are mixed in a high-speed mixer:

37.48 wt.% Water, 2.35 wt.% Soprophor 4D 384, 4.00 wt.% Propylene glycol, 1.00 wt.% DMSO, 0.14 wt.% Rhodersil 426R, 2.50 wt.% Paraffin-type highly refined mineral oil with an initial boiling point of not less than 300 ° C and a final boiling point of not more than 500 ° C, a freezing point of not more than -5 ° C, a total aromatics content of less than 2% and a benzo (a) pyrene content not exceeding 50 parts per billion (SAE), 2.50% HDK silica and 45.50% sulfur by weight.

The whole is ground in a bead mill and then 5.00% by weight of a 2% Rhodopol solution is added while stirring.

A sulfur-containing agent showing good biological effectiveness is thus obtained. The agent contains 1.00 wt.% DMSO and 2.50 wt.% Mineral oil (SAE).

Tables 1, 2 and 3 show the biological efficacy of an agent of the invention in comparison with known agents.

Example 2 illustrates the biological effectiveness of an agent of the invention compared to known fungicides.

P r z x l a d II

T a b e l a 1

Greenhouse experience in protecting tomatoes against powdery mildew (Oidium lycopersici)

Attempt Concentration measure (%) Concentration of s.b.cz. (%) % infested surface the leaf Effectiveness (%) Agent according to the invention 0.2 0.08 0.2 97.7 Tiotar 800 SC (known) 0.3 0.24 0.2 97.7 Tiovol 800 SC (known) 0.3 0.24 0.3 96.5 Control (no measure) - - 8.7 0.0

Table 1 summarizes the effects of an agent according to the invention in a greenhouse experiment on sprayed tomato plants artificially infected with the fungus Oidium lycopersici. The agent according to the invention containing sulfur with a built-in adjuvant despite a 3-fold reduction in SBF. (sulfur) showed the same effectiveness as compared to the standard used.

Example III illustrates the biological effectiveness of an agent of the invention compared to known fungicides.

PL 198 183 B1

P r z x l a d III

T a b e l a 2

Field experiment in the protection of cucumber against powdery mildew (Erysiphe cichoracearum)

Attempt Concentration measure (%) Concentration of s.b.cz. (%) % infested surface the leaf Effectiveness (%) Crop commercial kg / plot Agent according to the invention 0.2 0.08 0.0 100 5.6 Tiotar 800 SC (known) 0.3 0.24 0.0 100 5.6 Tiovol 800 SC (known) 0.3 0.24 0.2 98.7 5.1 Control (no measure) - - 65.1 0.0 2.2

Table 2 summarizes the effects of an agent according to the invention in a field experiment on sprayed cucumber plants artificially infected with the fungus Erysiphe cichoracearum. The agent according to the invention, despite the dramatic reduction in SBF (sulfur) showed similar effectiveness to the applied standard (sulfur) in protection against Erysiphe cichoracearum and the size of the obtained commercial yield.

Example IV illustrates the biological effectiveness of an agent of the invention compared to known fungicides.

P r x l a d IV

T a b e l a 3

Field experiment in protecting parsley from powdery mildew (Erysiphe heraclei)

Attempt Dose measure In l / ha Sbcz dose g ^{/ h} a % the infested leaf surface Effectiveness (%) Agent according to the invention 1.5 600 0.4 97.9 Tiotar 800 SC (known) 2.0 1600 0.3 98.4 Tiovol 800 SC (known) 2.0 1600 0.3 98.4 Control (no measure) - - 19.0 0.0

Table 3 summarizes the effects of the agent according to the invention in the field experiment on sprayed parsley plants artificially infected with the fungus Erysiphe heraclei. The sulfur-containing agent according to the invention with an incorporated adjuvant, despite a significant reduction in BSF. (2.6x) showed similar effectiveness to the standard used (sulfur).

Claims (1)

Patent claim A fungicide in the form of a concentrated aqueous suspension containing sulfur as a biologically active substance, as well as known dispersants, wetting agents, freezing point depressants, antifoams, mineral carriers as well as bactericides and thickeners, characterized in that it contains dimethylsulfoxide in the amount of 0.5-2 % by weight incorporated together with a highly refined mineral oil of paraffinic type in an amount of 0.5 - 6% by weight.