METHOD FOR REDUCING PHYTOTOXICITY OF FUNGICIDES

Abstract

The present invention relates to a method for reducing the phytotoxicity of systemic fungicides, mainly triazoles, in susceptible cultivars, mainly soy cultivars. The present method makes it unnecessary to develop new diversified fungicide formulations and to add specific substances to reduce the toxicity of these products.

Claims

1. A method for reducing phytotoxicity of fungicides characterized in that the fungicides are systemic, because it is used in cultivars, especially of susceptible soybean, and in that it includes the following steps: (i) add to the spray tank mancozeb (manganese ethylene bis(dithiocarbamate)+Zn) together with the fungicide; (ii) trigger the spray tank agitator; and (iii) once the syrup is homogenized, apply the syrup in the soybean crop.

2. The method according to claim 1, characterized in that the systemic fungicides are the triazoles.

3. The method according to claim 2, characterized by the fact that the triazoles fungicides with the reduced phytotoxicity are tebuconazole or prothioconazole.

4. The method according to claim 1, characterized in that the mancozeb is added in amount ranging from 1.0 kg/ha and 5.0 kg/ha, preferably 1.0 to 4.0 kg/ha, most preferably between 1.0 and 3.0 kg/ha.

5. The method according to claim 1, characterized in that the fungicide mixed with mancozeb in the tank is a mixture of prefabricated “DMI (demethylation inhibitor)+QoI” (quinone outside inhibitor) or “DMI (demethylation inhibitor)+SDHI” (succinate dehydrogenase inhibitor).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0016] In order to solve one of the problems encountered in the state of art, the present invention developed a method for reducing the phytotoxicity of triazoles fungicides in soybean cultivars. Although the triazoles, such as tebuconazole and prothioconazole, are fungicides commonly used in the control of fungal diseases on soybean crops, they are also causing more toxic effect on plants (phytotoxicity) even at normal doses used for the control of diseases. In the specific case of tebuconazole, both the EC and SC formulations can cause serious injuries in plants; however, in soybean crops, which causes more injury is the EC.

[0017] The present invention solves the problem of tebuconazole with the mixture thereof with a multi site fungicide, especially a dithiocarbamate, specifically mancozeb, which has the purpose of increasing the tolerance to the triazoles fungicides. Therefore, the present invention enables the safe use of triazoles fungicides, especially tebuconazole and prothioconazole, in all soybean cultivars. The process consists of:

[0018] add the spray tank, mancozeb (manganese ethylene bis(dithiocarbamate) +Zn) in an amount ranging from 1.0 kg/ha and 5.0 kg/ha, preferably 1.0 to 4.0 kg/ha, more preferably between 1.0 and 3.0 kg/ha, together with the fungicide (mixture of prefab “DMI+QoI” or “SDHI+DMI”); trigger the spray tank agitator; and

[0019] once the syrup is homogenized, apply the syrup in the soybean crop.

[0020] The advantage of the method of the present invention is to use the multi site fungicide mancozeb, since so far there are not known cases of fungi resistant to it. The mancozeb is shown therefore as broad-spectrum fungicide highly important for eliminating undesirable phytotoxicity on soybean caused by triazoles fungicides, more precisely by the tebuconazole and prothioconazole. It should be noted that mancozeb has never before been used for this purpose.

[0021] Therefore, the present invention, despite being represented by an extremely simple method, it should be seen as innovative and very important for the soybean crop sustainability in Brazil and worldwide. This is because this method has never been used to fight phytotoxicity in crops (this includes the soybean culture).

[0022] It will be readily understood by those skilled in the art that modifications can be made herein without thereby departing from the concepts set forth in the above description. These modifications are to be considered comprised by the scope of the present invention.