Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Ester doai
Reexamination Certificate
1996-11-04
2001-11-20
Pak, John (Department: 1616)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Ester doai
C514S256000, C514S269000, C514S359000, C514S365000, C514S383000, C514S388000, C514S389000, C514S391000, C514S394000, C514S395000, C514S396000, C514S399000, C514S400000, C514S479000, C514S483000, C514S521000, C514S532000, C514S538000, C514S539000, C514S543000, C514S640000, C514S617000, C514S724000, C514S739000, C514S762000, C514S763000, C514S764000, C514S765000, C514S772000, C514S789000, C514S922000, C514S974000, C424S406000, C424SDIG008
Reexamination Certificate
active
06319949
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a spray adjuvant useful in the application of pesticides for treating crops which alleviates phytotoxicity associated with chlorothalonil and to a method for preventing fungal diseases employing such spray adjuvant in combination with pesticides. The invention more particularly relates to a method for preventing fungal disease in crops such as banana crops in which a spray adjuvant is used which provides satisfactory uptake of a systemic fungicide such as propiconazole but minimizes the phytotoxicity of a contact fungicide such as chlorothalonil.
Systemic fungicides and other systemic pesticides are commonly applied to crops as an aqueous spray containing spray adjuvants such as surfactants and emulsified agricultural crop oils which insure that the pesticide is deposited as a droplet which wets the leaf and is retained on the leaf of the plant so that the pesticide can be absorbed. For example, banana spray oils (BSO), commonly used in combination with systemic fungicides in banana production, deposit an oily residue on the leaf surface which promotes the uptake of the systemic fungicide.
To reduce developing resistance to any particular pesticide, it is common practice to rotate pesticides. In some areas of the world, it is a common practice of growers to sequentially or simultaneously treat the crops with a systemic fungicide cocktail containing BSO and with chlorothalonil. However, an antagonistic response has been observed involving the oil and chlorothalonil resulting in unacceptable necrosis of leaf tissue.
SUMMARY OF THE INVENTION
In accordance with the present invention, an effective spray adjuvant in combination with a pesticide is employed that alleviates phytotoxic interaction often associated with chlorothalonil applications. Thus, treatment programs in which the two types of fungicides are used sequentially, or in combination, can be utilized to provide better overall disease control and to retard the development of disease resistance to systemic fungicides. In accordance with one embodiment of this invention, a combination of solvents and emulsifiers is provided which stimulates the foliar uptake of systemic fungicides and other pesticides without phytotoxic interactions associated with subsequent, concurrent or previous chlorothalonil applications. The solvent and emulsifier are typically used as a tank-mix adjuvant which can be added to commercial pesticidal formulations for liquid application to foliage of crops such as bananas, or they can be added by the manufacturer directly to the commercial formulation. The invention may also be used to enhance fungicide uptake in crops other than bananas, e.g., peanut crops, cereal crops, vegetable crops, fruit crops, forage crops, and tree crops. Similarly, this invention may be used to enhance the efficacy of other pesticides including herbicides and insecticides.
One manifestation of the invention is a method for preventing fungal disease in crops which comprises the steps of:
(a) applying to a crop an aqueous spray composition which includes a pesticide and an emulsifier-solvent combination wherein the solvent is a mixture of aliphatic hydrocarbons having a distillation range, at ambient pressure, of about 520 to 600° F. and an aromatic content of about 1% by weight or less, or the solvent is a single or combination of C
6
-C
18
fatty alcohol(s) preferably C
10
-C
14
fatty alcohols; and
(b) applying chlorothalonil to the crop, wherein any phytotoxicity associated with the application of chlorothalonil is reduced or eliminated. The chlorothalonil can be applied to the crop prior to, simultaneously with, or subsequent to the application of the aqueous spray composition. In addition to being a method for treating crops, those skilled in the art will appreciate that the invention also provides spray formulations and adjuvants formulations.
Another manifestation of the invention is a method for preventing fungal disease in crop which comprises the steps of:
(a) applying to a crop a non-aqueous based spray composition which includes a pesticide and a solvent, wherein the solvent is a mixture of aliphatic hydrocarbons having a distillation range of about 520 to 600° F. and an aromatic content of about 1% by weight or less, or the solvent is a single or combination of C
6
-C
18
fatty alcohol(s); and
(b) apply chlorothalonil to the crop previously to, simultaneously with, or subsequently to the application of the non-aqueous spray composition, wherein phytotoxicity associated with the application of chlorothalonil is reduced or eliminated.
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Crosby Kevin E.
Moser Robert E.
Schussler Jeffrey R.
Washington John R.
Hale and Dorr LLP
Pak John
Syngenta Limited
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