Sabadilla oil and uses thereof

Abstract

The present invention is directed to methods of controlling pathogenic fungi comprising applying sabadilla oil.

Claims

1. A method of controlling fungi comprising applying an effective amount of sabadilla oil to the fungi or the fungi's environment, wherein the sabadilla oil does not contain an alkaloid.

2. The method of claim 1, wherein the sabadilla oil is derived from Schoenocaulon officinale.

3. The method of claim 1, wherein the sabadilla oil is extracted from seeds.

4. The method of claim 1, wherein the sabadilla oil is at a concentration from about 0.05% to about 5.0% w/w and wherein w/w denotes weight by total weight of the mixture.

5. The method of claim 1, wherein the fungi is a pathogenic fungus.

6. The method of claim 1, wherein the sabadilla oil is applied to the fungi or the fungi's environment at a rate from about 1 to about 100,000 grams per hectare.

7. The method of claim 1, wherein the sabadilla oil is applied to the fungi or the fungi's environment at a rate from about 1 to about 20,000 grams per hectare.

8. The method of claim 1, wherein the sabadilla oil is applied to the fungi or the fungi's environment at a rate from about 5 to about 10,000 grams per hectare.

9. The method of claim 1, wherein the sabadilla oil is applied to the fungi or the fungi's environment at a rate from about 50 to about 10,000 grams per hectare.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) Applicant unexpectedly discovered that sabadilla oil is an effective fungicide.

(2) The present invention is directed to methods of controlling pathogenic fungi comprising applying sabadilla oil to the fungi's environment.

(3) Sabadilla oil may be derived from any species of Schoenocaulon. The genus Schoenocaulon includes the following species: S. calcicola, S. caricifolium, S. comatum, S. conzattii, S. dubium (alt. S. gracile), S. framei, S. ghiesbreghtii (alt. S. drummondii, S. yucatanense), S. ignigenum, S. intermedium, S. jaliscense, S. macrocarpum (alt. S. lauricola), S. madidorum, S. megarrhizum, S. mortonii, S. oaxacense, S. obtusum, S. officinale, S. pellucidum, S. plumosum, S. pringlei, S. rzedowskii, S. tenorioi, S. tenue, S. tenuifolium, S. texanum, and S. tigrense. In a preferred embodiment, the sabadilla oil is derived from S. officinale. Further, sabadilla oil may be obtained from any part of the plant. In a preferred embodiment, the sabadilla oil is obtained from the seeds of the plant. In another preferred embodiment, the sabadilla oil is free of seed material including cellulose, hemicellulose, lignin and pectin.

(4) As used herein, all numerical values relating to amounts, weight percentages and the like are defined as about or approximately each particular value, namely, plus or minus 10%. For example, the phrase at least 5% by weight is to be understood as at least 4.5% to 5.5% by weight. Therefore, amounts within 10% of the claimed values are encompassed by the scope of the claims.

(5) The term effective amount means the amount of the formulation that will control the target pest. The effective amount will vary depending on the concentration, the type of pest(s) being treated, the severity of the pest infestation, the result desired, and the life stage of the pest during treatment, among other factors. Thus, it is not always possible to specify an exact effective amount. However, an appropriate effective amount in any individual case may be determined by one of ordinary skill in the art.

(6) As used herein, w/w denotes weight by weight of the total mixture.

(7) In another preferred embodiment, the sabadilla oil of the present invention may be included in a composition containing one or more excipients selected from the group consisting of solvents, anti-caking agents, stabilizers, defoamers, slip agents, humectants, dispersants, wetting agents, thickening agents, emulsifiers, penetrants, adjuvants, synergists, polymers, propellants and/or preservatives.

(8) In a preferred embodiment, the pathogenic fungus is a fungal plant pathogen.

(9) The sabadilla oil of the present invention can be applied by any convenient means. Those skilled in the art are familiar with the modes of application including spraying, brushing, soaking, in-furrow treatments, pressurized liquids (aerosols), fogging or side-dressing.

(10) In a preferred embodiment, sabadilla oil is applied to the pest or the pest's environment at a rate from about 1 to about 100,000 grams per hectare (g/HA), preferably from about 1 to about 20,000 g/HA, more preferably from about 5 to about 10,000 g/HA and most preferably from about 50 to about 10,000 g/HA.

(11) In another preferred embodiment, compositions of the present invention comprise from about 0.05% to about 5.0% w/w sabadilla oil.

(12) As used herein, control a pest or controlling pest(s) refers to killing, incapacitating, repelling, or otherwise decreasing the negative impact of the pest on plants or animals to a level that is desirable to the grower or animal.

(13) As used herein, fungi's environment refers to any area that the fungi are present during any life stage. One environment likely to be treated by the methods of the present invention includes the plants and plant propagation materials that the fungi is living on and the surrounding soil. The fungi's environment may also include harvested plants, gardens, fields, greenhouses, or other buildings, and various indoor surfaces and structures, such as furniture including beds, and furnishings including books, clothing, etc.

(14) The articles a, an and the are intended to include the plural as well as the singular, unless the context clearly indicates otherwise. For example, the methods of the present invention are directed to controlling pest but this can include control of a multiple pests (such as a more than one pathogenic fungus or more than one pathogenic fungus species).

(15) The present invention is illustrated by the following representative examples.

Example 1

(16) The objective of Example 1 was to evaluate the efficacy of sabadilla oil against naturally occurring Fuchsia rust caused by the fungal pathogen, Pucciniastrum epilobii on Fuchsia.

(17) Method:

(18) Only plants showing low levels of rust infestation at the start of the trial were included in the trial. Plants were maintained in plastic pots (11 cm diameter), containing Clover multi-purpose, peat based compost during the study. Plants were maintained under optimal growing conditions. No other plant protection products were applied during the study.

(19) Sabadilla oil was applied as an emulsion concentrate (EC) formulation containing 70% sabadilla oil at 2.0 and 4.0% v/v concentrations. During the course of the study, a total of five treatment applications were made at 7 days' intervals. All treatment applications were made using a pressurized CP1.5 Cooper Pegler Compression Hand sprayer. The spray equipment was fully calibrated to obtain complete coverage of the plants. Each treatment was replicated five times. Each replicate consisted of one plant (Fuchsia Tom West Meillez (v)), which were at growth stage BBCH 32-34 (two to four visibly extended internodes). The treatments were arranged in a randomized block design within the greenhouse.

(20) An initial assessment of rust infestation was recorded at 0-day. Plots were arranged to ensure an even distribution of infection prior to treatment application. Efficacy data was collected 1DAA (day after application), 3DAA, 7DAA, 14DAA, 21DAA, 28DAA, and 35DAA. The following variables were assessed: 1) percentage leaf area affected on 5 randomly selected leaves per plant; 2) percentage of leaves infected per plant (14DAA onwards); 3) phytotoxicity; and 4) plant vigor.

(21) Data were analyzed using analysis of variance (ANOVA). Tukey Kramer HSD comparison tests were used to distinguish between treatment means.

(22) For each treatment, the corrected percentage control of rust was calculated relative to untreated control plots by means of the Henderson-Tilton formula (Henderson, C. F. and E. W. Tilton, 1955. J. Econ. Entomol. 48:157-161):
Corrected % control=1(Ta/Ca)(Cb/Tb)100

(23) Where:

(24) Ta=Mean % leaf area affected in treated plots after application

(25) Ca=Mean % leaf area affected in control plots after application

(26) Cb=Mean % leaf area affected in control plots before application

(27) Tb=Mean % leaf area affected in treated plots before application

(28) Results:

(29) Sabadilla oil treatments did not show negative impact on plant vigor. Similarly, no phytotoxicity was observed on plants exposed to sabadilla treatments.

(30) The percentage of leaf area affected by rust was similar in all treatments prior to treatment application.

(31) Sabadilla oil applied at 2.0% showed significant reduction of the development of rust infection in Fuchsia plants by 14-days relative to the control. Sabadilla oil applied at 4.0% also showed numerically superior performance to the control but the difference was not significant. However, by 28-days both sabadilla oil treatments provided a significant control of rust infestations (Table 1).

(32) TABLE-US-00001 TABLE 1 Efficacy of sabadilla oil in controlling Fuchsia rust (mean percentage of affected leaf area). Treatment 0DAA.sup.1 1DAA 3DAA 7DAA 14DAA 21DAA 28DAA 35DAA Date 06.11.15 07.11.15 09.11.15 13.11.15 20.11.15 27.11.15 04.12.15 11.12.15 Water Control 1.12 A 0.88 A 1.44 A 2.96 A 6.12 A 7.24 A 6.08 A 6.16 A Sabadilla oil at 2% v/v 1.04 A 1.20 A 1.20 A 1.72 A 1.76 B 1.84 B 0.88 B 0.92 B Sabadilla oil at 4% v/v 1.00 A 1.20 A 1.00 A 2.04 A 2.00 AB 2.12 AB 1.40 B 1.16 B .sup.1Values followed by the same letter are not significantly different (Tukey-Kramer HSD comparison tests, P 0.05).

(33) In terms of the frequency of rust infestation per plant, sabadilla oil provided approximately 3-5 reduction of rust infestation but these differences were not significant (P 0.05) (Table 2). However, the data clearly demonstrates that applications of sabadilla oil reduce the spread of the disease within the canopy.

(34) TABLE-US-00002 TABLE 2 Efficacy of sabadilla oil in controlling Fuchsia rust (mean percentage of leaf infected per plant). Treatment 14DAA 21DAA 28DAA 35DAA Date 20 Nov. 2015 27 Nov. 2015 4 Dec. 2015 11 Dec. 2015 Water 29.0 A 35.0 A 32.0 A 33.0 A Control Sabadilla 12.0 A 9.4 A 5.8 A 5.8 AB oil at 2% v/v Sabadilla 14.4 A 13.4 A 11.4 A 9.4 AB oil at 4% v/v .sup.1Values followed by the same letter are not significantly different (Tukey-Kramer HSD comparison tests, P 0.05).

(35) In terms of overall control, the application of sabadilla oil provided 80% control of rust infection by the end of the study. Furthermore, evidence of suppression of disease was already evident by 7-days and the efficacy of sabadilla oil was maintained for the remainder of the study (Table 3).

(36) TABLE-US-00003 TABLE 3 Overall efficacy of sabadilla oil in controlling Fuchsia rust (% control). Treatment 1DAA.sup.1 3DAA 7DAA 14DAA 21DAA 28DAA 35DAA Water control 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Sabadilla oil at 2% v/v 46.85 10.26 37.42 69.03 72.63 84.41 83.92 Sabadilla oil at 4% v/v 52.73 22.22 22.81 63.40 67.20 74.21 78.91 .sup.1Negative values indicate zero control.
Conclusion:

(37) Sabadilla oil applied at 2 and 4% v/v demonstrated fungicidal efficacy against rust pathogens.

Example 2

(38) The objective of Example 2 was to evaluate the efficacy of sabadilla oil against naturally occurring powdery mildew infection caused by fungi in the Order Erysiphales on Dahlia.

(39) Method:

(40) Only plants that showed low levels of powdery mildew infestation at the beginning of the study were included. Plants were maintained in plastic pots (14 cm diameter), containing Clover multi-purpose, peat based compost during the study. Plants were maintained under protected conditions with good light, appropriate temperature settings and sufficient watering. No other plant protection products were applied during the study.

(41) Sabadilla oil was applied as an EC formulation containing 70% sabadilla oil at 2.0 and 4.0% v/v concentrations. During the course of the study, a total of five treatment applications were made at 7 days' intervals. All treatment applications were made using a pressurized CP1.5 Cooper Pegler Compression Hand sprayer. The spray equipment was fully calibrated to obtain complete coverage of the plants. Each treatment was replicated five times. Each replicate consisted of one plant (Dahlia, cultivar Bishop of Canterbury), which were at growth stage BBCH 22-32 (two side shoots with two visibly extended internodes). The treatments were arranged in a randomized block design within the greenhouse.

(42) An initial assessment of powdery mildew infestation was recorded at 0-day. Plots were arranged to ensure an even distribution of infection prior to treatment application. Efficacy data was collected 1DAA (day after application), 3DAA, 7DAA, 14DAA, 21DAA, 28DAA, and 35DAA. The following variables were assessed: 1) percentage leaf area affected on 5 randomly selected leaves per plant; 2) percentage of leaves infected with powdery mildew per plant; 3) phytotoxicity; and 4) plant vigor.

(43) Data were analyzed using analysis of variance (ANOVA). Tukey Kramer HSD comparison tests were used to distinguish between treatment means.

(44) For each treatment, the corrected percentage control of powdery mildew was calculated relative to untreated control plots by means of the Henderson-Tilton formula (Henderson, C. F. and E. W. Tilton, 1955. J. Econ. Entomol. 48:157-161):
Corrected % control=1(Ta/Ca)(Cb/Tb)100

(45) Where:

(46) Ta=Mean % leaf area affected in treated plots after application

(47) Ca=Mean % leaf area affected in control plots after application

(48) Cb=Mean % leaf area affected in control plots before application

(49) Tb=Mean % leaf area affected in treated plots before application

(50) Results:

(51) Sabadilla oil treatments did not show negative impact on plant vigor. Similarly, no phytotoxicity was observed on plants exposed to sabadilla treatments.

(52) The percentage of leaf area affected by powdery mildew was similar in all treatments prior to treatment application.

(53) Sabadilla oil applied at 2.0 and 4.0% showed a significant reduction of the development of powdery mildew immediately after the first treatment application. Significant control of powdery mildew was maintained throughout the course of the study by sabadilla oil treatments (Table 4).

(54) TABLE-US-00004 TABLE 4 Efficacy of sabadilla oil in controlling powdery mildew (mean percentage of affected leaf area). Treatment 0DAA.sup.1 1DAA 3DAA 7DAA 14DAA 21DAA 28DAA 35DAA Date 06.07.16 07.07.16 09.07.16 13.07.16 20.07.16 27.07.16 03.08.16 10.08.16 Water Control 12.60 A 16.20 A 20.80 A 27.20 A 34.80 A 33.60 A 37.20 A 34.80 A Sabadilla oil at 2% v/v 12.40 A 3.00 B 4.60 B 7.60 B 3.80 B 1.16 B 1.00 B 0.88 B Sabadilla oil at 4% v/v 12.40 A 1.60 B 1.80 B 1.68 BC 0.20 C 0.00 C 0.00 C 0.00 C .sup.1Values followed by the same letter are not significantly different (Tukey-Kramer HSD comparison tests, P 0.05).

(55) Sabadilla oil application also significantly reduced the frequency of powdery mildew infestation per plant (Table 5). This reduction of powdery mildew infection was evident immediately after the first application of sabadilla oil. Furthermore, the high efficacy of sabadilla oil against powdery mildew was maintained throughout the course of the study.

(56) TABLE-US-00005 TABLE 5 Efficacy of sabadilla oil in controlling powdery mildew (mean percentage of leaf infected per plant). Treatment 0DAA.sup.1 1DAA 3DAA 7DAA 14DAA 21DAA 28DAA 35DAA Date 06.07.16 07.07.16 09.07.16 13.07.16 20.07.16 27.07.16 03.08.16 10.08.16 Water Control 41.0 A 50.0 A 54.0 A 56.0 A 53.0 A 50.0 A 56.0 A 58.0 A Sabadilla oil at 2% v/v 36.0 A 24.0 B 19.0 B 25.0 B 19.0 AB 6.0 B 4.0 B 2.2 B Sabadilla oil at 4% v/v 41.0 A 9.0 B 6.0 B 5.0 B 1.0 C 0.0 C 0.0 B 0.0 C .sup.1Values followed by the same letter are not significantly different (Tukey-Kramer HSD comparison tests, P 0.05).

(57) In terms of overall control, the application of sabadilla oil provided a very high level of efficacy against powdery mildew infection. A clear dose response was evident for the efficacy sabadilla oil treatments especially at the early stages of the study. Sabadilla oil applied at 4% v/v achieved >90% control of powdery mildew shortly after the first treatment application (3 DAA) and >90% efficacy was maintained throughout the study. Sabadilla oil applied at 2% v/v achieved >90% efficacy against powdery mildew by day 21 (Table 6).

(58) TABLE-US-00006 TABLE 6 Overall efficacy of sabadilla oil in controlling powdery mildew (% control). Treatment 1DAA 3DAA 7DAA 14DAA 21DAA 28DAA 35DAA Water Control 0.0 0.0 0.0 0.0 0.0 0.0 0.0 Sabadilla oil at 2% v/v 81.18 77.53 71.61 88.90 96.49 97.27 97.43 Sabadilla oil at 4% v/v 89.96 91.21 93.72 99.42 100.00 100.00 100.00
Conclusion:

(59) Sabadilla oil applied at 2 and 4% v/v demonstrated fungicidal efficacy against powdery mildew pathogen.