Methods for controlling plant pathogens using N-phosphonomethylglycine

a technology of n-phosphonomethylglycine and pest control, which is applied in the field of pest control methods and compositions for plants, can solve the problems of increasing the cost of growing crops and environmental impact, increasing the cost of crop loss control, and increasing so as to prevent or control plant diseases, reduce crop residues and environmental residues, and reduce the number of chemical applications

Inactive Publication Date: 2005-10-06
MONSANTO TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012] The present invention also provides an admixture of a glyphosate compound and a pest control compound. Preferably, the admixture comprises a glyphosate compound and a fungicide compound for use on a glyphosate tolerant cro plant to prevent or control plant disease caused by a plant pathogen, in particular, the plant pathogen is a fungus and has a glyphosate sensitive 5-enolpyruvylshikimate-3-phosphate synthase. The fungicide compound of the admixture may be a systemic or contact fungicide or mixtures of each. More particularly the fungicide compound includes, but is not limited to members of the chemical groups strobilurins, triazoles, chloronitriles, carboxamides and mixtures thereof. The pest control compound in the admixture with glyphosate further comprises an insecticide compound, thereby reducing the numbers of chemical applications to a field of glyphosate tolerant plants.
[0013] The present invention provides a method to reduce the crop residues and environmental residues of a glyphosate compound and a fungicide compound by formulating an admixture of the compounds, and applying to a crop plant a dose that is less than the dose normally applied to a crop plant of each compound, wherein the treated crop plant is protected from crop losses due to fungal disease, and the glyphosate and fungicide residues in the plant or environment are reduced.

Problems solved by technology

However, sufficient genetic resistance is not always available in the crops being produced or undesirable traits are linked to the genetic resistance genetic loci.
Farmers must then apply pesticides to control the pathogen infections, significantly increasing the cost of growing the crops and impact to the environment.
Controlling the crop loss to fungal diseases is expensive.

Method used

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  • Methods for controlling plant pathogens using N-phosphonomethylglycine
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Examples

Experimental program
Comparison scheme
Effect test

example 1

In vitro Effects of Glyphosate on Plant Pathogens

[0090] In vitro screens identified glyphosate as a very weak fungicide against a series of pathogenic organisms. Table 2 shows that when various fungal plant pathogens are grown on growth media containing various concentrations of glyphosate to measure EC90 concentrations (the concentration for 90% of maximal effect of, e.g., inhibiting fungal cell proliferation or statistically reducing the level fungal growth). These data demonstrate a high concentration of glyphosate is required to inhibit fugal growth in vitro. It was therefore a surprising result when it was observed that glyphosate tolerant plants when treated with glyphosate showed resistance to fungal disease. The glyphosate residue analysis shown in Table 1 would have suggested that the levels of glyphosate in the plant tissues to be too low for effective inhibition of fungal pathogens. The susceptibility of fungal pathogens to glyphosate effects may change when the pathogen...

example 2

Disease Treatment in Glyphosate Tolerant Wheat

[0091] Compositions of water, surfactant (a 0.1% solution), glyphosate formulations (WeatherMAX® (glyphosate-K salt), UltraMAX® (glyphosate-IPA salt), or a glyphosate composition without surfactant (IPA-salt) are applied to glyphosate tolerant wheat plants at different growth stages that have been previously inoculated with leaf rust (Puccinia triticina) to test for disease control. Three, five and seven-leaf stage wheat plants are inoculated with Puccinia triticina spores and incubated to allow for spore germination.

[0092] Plants are evaluated for disease at one day after treatment (1DAT) with the above compositions. In addition, wheat plants at the 5 leaf stage are used as an untreated control.

[0093] All eleven (11) untreated wheat plants exhibited significant leaf rust symptoms. Seven out of eight water-treated wheat plants (3-leaf stage) showed disease symptoms. Similarly, surfactant-treated plants at the 3 leaf and 7 leaf stages ...

example 3

Correlation of Tissue Glyphosate Concentration and Disease Prevention

[0096] To determine the correlation between glyphosate concentration in plant tissue and disease control, glyphosate tolerant wheat plants are treated with glyphosate compositions prior to inoculation with Puccinia spores. Four different regimens are employed. First, whole plants, either 3-leaf or 5-leaf stage, are treated with a 1× spray of WeatherMAX Roundup® glyphosate composition. A single mature leaf from each treated plant is inoculated with Puccinia spores either 1 day or 14 days after glyphosate application. The inoculated plants are then incubated for 24 hours at 100% relative humidity for germination of the spores. Twelve days after inoculation, disease conditions are evaluated and concentrations of glyphosate in the plant tissue is quantitated. Disease conditions are evaluated macroscopically for pustule development and lesion development.

[0097] Disease symptoms were prevented in inoculations both at 1...

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Abstract

The present invention relates to compositions and methods for disease control in plants. The compositions for use in the methods of the invention include glyphosate as the active compound. In addition, methods and compositions are disclosed to prevent and treat pest infection in glyphosate tolerant plants.

Description

[0001] This application claims benefit under 35USC § 119(e) of U.S. provisional application Ser. No. 60 / 557,403 filed Mar. 30, 2004, U.S. provisional application Ser. No. 60 / 622,134 filed Oct. 26, 2004, and U.S. provisional application serial number [Atty. Dkt. 16518.136PV] filed Feb. 18, 2005, herein incorporated by reference in their entirety.FIELD OF THE INVENTION [0002] The present invention relates to methods and compositions for pest control in plants. More particularly, it relates to methods and compositions for controlling, preventing, or treating plant pathogens using N-phosphonomethylglycine and compositions containing N-phosphonomethylglycine in plants tolerant to N-phosphonomethylglycine. BACKGROUND [0003] The development of herbicide tolerant crops allows for the greater use of post-emergent herbicides during agricultural cultivation of the crop. One example of a post-emergent herbicide is N-phosphonomethylglycine, also known as glyphosate, a well known herbicide that h...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01H1/00A01N43/653A01N53/00A01N57/18A01N57/20C12N15/82
CPCA01N57/20C12N15/8275C12N15/8281C12N15/8282A01N25/00A01N2300/00
Inventor CLINTON, WILLIAM P.FENG, PAUL C.C.MITCHELL, JAMES F.UHR, DAVID V.
Owner MONSANTO TECH LLC
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