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EFFICACY OF HEXYGON AND COMPANION MITICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITE ON GREENHOUSE MARIGOLD, 2011

EFFICACY OF HEXYGON AND COMPANION MITICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITE ON GREENHOUSE... Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.G21 (G21) MARIGOLD: Tagetes patula L., ‘Petite’ EFFICACY OF HEXYGON AND COMPANION MITICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITE ON GREENHOUSE MARIGOLD, 2011 James F. Price University of Florida-IFAS Gulf Coast Research and Education Center 14625 CR 672 Wimauma, FL 33598 Phone: (813) 633-4123 Fax: (813) 634-0001 Email: jfprice@ufl.edu Curtis A. Nagle Email: cnagle@ufl.edu Twospotted spider mite: Tetranychus urticae Koch The efficacy of Hexygon, alone and mixed with companion miticides, Avid, M-Pede or Magus, for control of TSM on greenhouse ornamentals was evaluated compared to a non-treated check. Tests were conducted at the Gulf Coast Research and Education Center, Wimauma, Fla. in the Spring of 2011. Two seeds of ‘Petite’, mixed colors marigold, per 2 inch cell, were planted into polystyrene trays on 16 Mar. The resulting seedlings were transplanted to 6-inch pots on 15 Apr and pinched to four nodes on 27 Apr. On 29 Apr, the pots were arranged on a greenhouse bench in plots of three pots each and were infested with about 10-15 motile TSM per pot. TSM were from a laboratory colony reared on bush lima beans (Phaseolus lunatus L.). Pre-treatment samples were taken on 5 May, and later that day all plots were sprayed with Rimon 0.83EC at 12 fl. oz. per 100 gal., to reduce thrips damage to the foliage. Experimental treatments were applied on 6 May and were replicated six times in a RCB design. Induce , non-ionic surfactant, was added to all spray preparations at 32 fl. oz. per 100 gal., and applied with water to the non-treated plots. The plants were spaced so that those from adjacent plots would not touch. Treatments were applied using a hand-held sprayer with a spray wand outfitted with a nozzle containing a 45° core and a no. 4 disc. The sprayer was pressurized by CO to 40 psi and calibrated to wet the leaf surfaces thoroughly without excessive run off. Sampling was performed 3 days after treatment (DAT) and then about weekly through Jun 1. Samples consisted of three leaves per plot (one from each pot), selected from the middle one third stratum of the plant. Samples were transported to the laboratory where the numbers of motile and egg form TSM on half of each lower leaf surface (one side of mid-vein) were counted using a dissecting microscope. Data were recorded as numbers of motile and egg form TSM per 1.5 leaves. Distinctions could not be made between viable and non-viable eggs, thus total eggs were recorded. Data were transformed log10(x+1) prior to ANOVA and means were separated by Fisher’s Protected LSD test (P=0.05). Means were reported in the original scale. Average motile TSM densities ranged from 40.5 to 86.0 per 1.5 leaves 1 day before treatments were applied. At 3 DAT, the lowest densities of motile TSM occurred in treatments of any combination of Hexygon with Magus or Magus alone at 12 fl. oz. (Table 1). By 13 DAT, motile TSM densities occurred in treatments of Avid alone or with Hexygon, or any treatment of Hexygon with Magus. The lowest motile densities by 26 DAT occurred in treatments of Avid alone or combined with Hexygon at 2 oz., and those densities were about ten times the levels observed in the previous week’s samples (Table 1). There were no significant differences in TSM egg densities among any treatments until 6 DAT. At that time, lowest egg densities occurred in treatments of Avid alone or with Hexygon, or Hexygon combined with Magus, excluding Hexygon at 2 oz. plus Magus at 12 fl. oz. (Table 2). By 18 DAT, the lowest egg densities occurred only in treatments of Avid alone or with Hexygon. Eight days later (26 DAT), egg densities in those treatments increased to more than ten times the levels observed in the previous samples (Table 2). No phytotoxicity was observed. 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.G21 TABLE 1. No. motile TSM per 1.5 leaves Treatment/ Rate Pre- a b Formulation amt/100 gal. treatment 3 DAT 6 DAT 13 DAT 18 DAT 26 DAT Non-treated -- 40.5a 39.7ab 72.2a 94.3a 404.7a 172.8ab Hexygon 50DF 1 oz. 78.2a 45.2a 55.0ab 126.5a 293.8a 208.2a Hexygon 50DF 2 oz. 49.8a 25.8ab 52.7ab 119.8a 248.7a 230.3a Avid 0.15EC 4 fl. oz. 71.7a 15.5c-f 18.0c 3.8cd 3.5de 34.0fg M-Pede 49% 2 gal. 60.5a 32.5a-c 44.5ab 72.3a 398.3a 123.7a-c Magus 1.6SC 12 fl. oz. 66.3a 4.8f-i 4.5de 14.2b 40.8b 209.8a Magus 1.6SC 16 fl. oz. 61.0a 6.2d-h 2.0d-f 10.0bc 20.5b 124.0a-d Hexygon 50DF 1 oz. + Avid 0.15EC 4 fl. oz. 68.0a 8.3d-h 8.8d 1.8d 6.5cd 62.3d-f Hexygon 50DF 2 oz. + Avid 0.15EC 4 fl. oz. 47.5a 10.2d-g 7.8de 1.8d 2.0e 26.5g Hexygon 50DF 1 oz. + M-Pede 49% 2 gal. 46.5a 18.2a-d 30.8c 62.3a 295.0a 240.7a Hexygon 50DF 2 oz. + M-Pede 49% 2 gal. 86.0a 17.3b-e 26.0bc 60.3a 259.0a 198.0ab Hexygon 50DF 1 oz. + Magus 1.6SC 12 fl. oz. 60.3a 3.7g-i 1.3ef 5.8cd 19.8bc 124.8a-d Hexygon 50DF 2 oz. + Magus 1.6SC 12 fl. oz. 71.2a 6.2e-i 3.5de 5.0cd 16.5bc 92.5b-d Hexygon 50DF 1 oz. + Magus 1.6SC 16 fl. oz. 46.8a 1.8i 0.0f 7.0d 4.5de 67.5ef Hexygon 50DF 2 oz. + Magus 1.6SC 16 fl. oz. 54.2a 6.0hi 2.0ef 3.8d 7.0de 85.0c-e F 1.18 6.45 21.69 20.09 39.66 7.48 14,70 P-value 0.3132 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P=0.05). Data were transformed log (x+1) prior to ANOVA; non-transformed means are presented. a ® A ‘+’ sign indicates the products were combined. All treatments included Induce non-ionic surfactant at 32 fl. oz. per 100 gal. DAT indicates days after treatment. 2 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.G21 TABLE 2. No. egg TSM per 1.5 leaves Treatment/ Rate Pre- a b Formulation amt/100 gal. treatment 3 DAT 6 DAT 13 DAT 18 DAT 26 DAT Non-treated -- 91.5a 66.8a 76.7a-c 318.3a 334.8a 63.7de Hexygon 50DF 1 oz. 177.8a 89.3a 163.3a 438.3a 342.7a 55.2c-e Hexygon 50DF 2 oz. 112.8a 86.3a 96.3ab 295.2a 317.0a 73.0c-e Avid 0.15EC 4 fl. oz. 110.5a 58.3a 5.0h 11.2cd 6.3ef 98.3b-e M-Pede 49% 2 gal. 148.0a 53.5a 45.0c-e 415.2a 339.3a 38.7e Magus 1.6SC 12 fl. oz. 176.3a 54.7a 47.5b-d 22.8b 77.2c 273.7a Magus 1.6SC 16 fl. oz. 136.8a 41.3a 35.5d-g 22.2b 75.5bc 211.7ab Hexygon 50DF 1 oz. + Avid 0.15EC 4 fl. oz. 88.8a 45.5a 10.8gh 2.2d 10.5ef 116.0a-c Hexygon 50DF 2 oz. + Avid 0.15EC 4 fl. oz. 89.0a 75.5a 11.5f-h 1.8d 4.5f 65.5de Hexygon 50DF 1 oz. + M-Pede 49% 2 gal. 84.8a 61.3a 31.5d-g 170.3a 232.3ab 255.2ab Hexygon 50DF 2 oz. + M-Pede 49% 2 gal. 137.7a 65.2a 36.3c-f 315.5a 217.8ab 116.5b-d Hexygon 50DF 1 oz. + Magus 1.6SC 12 fl. oz. 125.2a 39.0a 14.7e-h 23.7bc 75.5cd 276.7ab Hexygon 50DF 2 oz. + Magus 1.6SC 12 fl. oz. 120.3a 61.0a 27.7d-g 8.3b-d 52.3cd 143.3ab Hexygon 50DF 1 oz. + Magus 1.6SC 16 fl. oz. 80.7a 28.8a 19.8d-h 4.5cd 16.8e 162.5a-c Hexygon 50DF 2 oz. + Magus 1.6SC 16 fl. oz. 108.7a 32.8a 7.2gh 18.5d 29.5de 206.7ab F 1.17 1.39 5.75 22.94 15.74 4.17 14,70 P-value 0.3145 0.1806 <0.0001 <0.0001 <0.0001 <0.0001 Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P=0.05). Data were transformed log (x+1) prior to ANOVA; non-transformed means are presented. a ® A ‘+’ sign indicates the products were combined. All treatments included Induce non-ionic surfactant at 32 fl. oz. per 100 gal. DAT indicates days after treatment. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EFFICACY OF HEXYGON AND COMPANION MITICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITE ON GREENHOUSE MARIGOLD, 2011

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Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.G21 (G21) MARIGOLD: Tagetes patula L., ‘Petite’ EFFICACY OF HEXYGON AND COMPANION MITICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITE ON GREENHOUSE MARIGOLD, 2011 James F. Price University of Florida-IFAS Gulf Coast Research and Education Center 14625 CR 672 Wimauma, FL 33598 Phone: (813) 633-4123 Fax: (813) 634-0001 Email: jfprice@ufl.edu Curtis A. Nagle Email: cnagle@ufl.edu Twospotted spider mite: Tetranychus urticae Koch The efficacy of Hexygon, alone and mixed with companion miticides, Avid, M-Pede or Magus, for control of TSM on greenhouse ornamentals was evaluated compared to a non-treated check. Tests were conducted at the Gulf Coast Research and Education Center, Wimauma, Fla. in the Spring of 2011. Two seeds of ‘Petite’, mixed colors marigold, per 2 inch cell, were planted into polystyrene trays on 16 Mar. The resulting seedlings were transplanted to 6-inch pots on 15 Apr and pinched to four nodes on 27 Apr. On 29 Apr, the pots were arranged on a greenhouse bench in plots of three pots each and were infested with about 10-15 motile TSM per pot. TSM were from a laboratory colony reared on bush lima beans (Phaseolus lunatus L.). Pre-treatment samples were taken on 5 May, and later that day all plots were sprayed with Rimon 0.83EC at 12 fl. oz. per 100 gal., to reduce thrips damage to the foliage. Experimental treatments were applied on 6 May and were replicated six times in a RCB design. Induce , non-ionic surfactant, was added to all spray preparations at 32 fl. oz. per 100 gal., and applied with water to the non-treated plots. The plants were spaced so that those from adjacent plots would not touch. Treatments were applied using a hand-held sprayer with a spray wand outfitted with a nozzle containing a 45° core and a no. 4 disc. The sprayer was pressurized by CO to 40 psi and calibrated to wet the leaf surfaces thoroughly without excessive run off. Sampling was performed 3 days after treatment (DAT) and then about weekly through Jun 1. Samples consisted of three leaves per plot (one from each pot), selected from the middle one third stratum of the plant. Samples were transported to the laboratory where the numbers of motile and egg form TSM on half of each lower leaf surface (one side of mid-vein) were counted using a dissecting microscope. Data were recorded as numbers of motile and egg form TSM per 1.5 leaves. Distinctions could not be made between viable and non-viable eggs, thus total eggs were recorded. Data were transformed log10(x+1) prior to ANOVA and means were separated by Fisher’s Protected LSD test (P=0.05). Means were reported in the original scale. Average motile TSM densities ranged from 40.5 to 86.0 per 1.5 leaves 1 day before treatments were applied. At 3 DAT, the lowest densities of motile TSM occurred in treatments of any combination of Hexygon with Magus or Magus alone at 12 fl. oz. (Table 1). By 13 DAT, motile TSM densities occurred in treatments of Avid alone or with Hexygon, or any treatment of Hexygon with Magus. The lowest motile densities by 26 DAT occurred in treatments of Avid alone or combined with Hexygon at 2 oz., and those densities were about ten times the levels observed in the previous week’s samples (Table 1). There were no significant differences in TSM egg densities among any treatments until 6 DAT. At that time, lowest egg densities occurred in treatments of Avid alone or with Hexygon, or Hexygon combined with Magus, excluding Hexygon at 2 oz. plus Magus at 12 fl. oz. (Table 2). By 18 DAT, the lowest egg densities occurred only in treatments of Avid alone or with Hexygon. Eight days later (26 DAT), egg densities in those treatments increased to more than ten times the levels observed in the previous samples (Table 2). No phytotoxicity was observed. 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.G21 TABLE 1. No. motile TSM per 1.5 leaves Treatment/ Rate Pre- a b Formulation amt/100 gal. treatment 3 DAT 6 DAT 13 DAT 18 DAT 26 DAT Non-treated -- 40.5a 39.7ab 72.2a 94.3a 404.7a 172.8ab Hexygon 50DF 1 oz. 78.2a 45.2a 55.0ab 126.5a 293.8a 208.2a Hexygon 50DF 2 oz. 49.8a 25.8ab 52.7ab 119.8a 248.7a 230.3a Avid 0.15EC 4 fl. oz. 71.7a 15.5c-f 18.0c 3.8cd 3.5de 34.0fg M-Pede 49% 2 gal. 60.5a 32.5a-c 44.5ab 72.3a 398.3a 123.7a-c Magus 1.6SC 12 fl. oz. 66.3a 4.8f-i 4.5de 14.2b 40.8b 209.8a Magus 1.6SC 16 fl. oz. 61.0a 6.2d-h 2.0d-f 10.0bc 20.5b 124.0a-d Hexygon 50DF 1 oz. + Avid 0.15EC 4 fl. oz. 68.0a 8.3d-h 8.8d 1.8d 6.5cd 62.3d-f Hexygon 50DF 2 oz. + Avid 0.15EC 4 fl. oz. 47.5a 10.2d-g 7.8de 1.8d 2.0e 26.5g Hexygon 50DF 1 oz. + M-Pede 49% 2 gal. 46.5a 18.2a-d 30.8c 62.3a 295.0a 240.7a Hexygon 50DF 2 oz. + M-Pede 49% 2 gal. 86.0a 17.3b-e 26.0bc 60.3a 259.0a 198.0ab Hexygon 50DF 1 oz. + Magus 1.6SC 12 fl. oz. 60.3a 3.7g-i 1.3ef 5.8cd 19.8bc 124.8a-d Hexygon 50DF 2 oz. + Magus 1.6SC 12 fl. oz. 71.2a 6.2e-i 3.5de 5.0cd 16.5bc 92.5b-d Hexygon 50DF 1 oz. + Magus 1.6SC 16 fl. oz. 46.8a 1.8i 0.0f 7.0d 4.5de 67.5ef Hexygon 50DF 2 oz. + Magus 1.6SC 16 fl. oz. 54.2a 6.0hi 2.0ef 3.8d 7.0de 85.0c-e F 1.18 6.45 21.69 20.09 39.66 7.48 14,70 P-value 0.3132 <0.0001 <0.0001 <0.0001 <0.0001 <0.0001 Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P=0.05). Data were transformed log (x+1) prior to ANOVA; non-transformed means are presented. a ® A ‘+’ sign indicates the products were combined. All treatments included Induce non-ionic surfactant at 32 fl. oz. per 100 gal. DAT indicates days after treatment. 2 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.G21 TABLE 2. No. egg TSM per 1.5 leaves Treatment/ Rate Pre- a b Formulation amt/100 gal. treatment 3 DAT 6 DAT 13 DAT 18 DAT 26 DAT Non-treated -- 91.5a 66.8a 76.7a-c 318.3a 334.8a 63.7de Hexygon 50DF 1 oz. 177.8a 89.3a 163.3a 438.3a 342.7a 55.2c-e Hexygon 50DF 2 oz. 112.8a 86.3a 96.3ab 295.2a 317.0a 73.0c-e Avid 0.15EC 4 fl. oz. 110.5a 58.3a 5.0h 11.2cd 6.3ef 98.3b-e M-Pede 49% 2 gal. 148.0a 53.5a 45.0c-e 415.2a 339.3a 38.7e Magus 1.6SC 12 fl. oz. 176.3a 54.7a 47.5b-d 22.8b 77.2c 273.7a Magus 1.6SC 16 fl. oz. 136.8a 41.3a 35.5d-g 22.2b 75.5bc 211.7ab Hexygon 50DF 1 oz. + Avid 0.15EC 4 fl. oz. 88.8a 45.5a 10.8gh 2.2d 10.5ef 116.0a-c Hexygon 50DF 2 oz. + Avid 0.15EC 4 fl. oz. 89.0a 75.5a 11.5f-h 1.8d 4.5f 65.5de Hexygon 50DF 1 oz. + M-Pede 49% 2 gal. 84.8a 61.3a 31.5d-g 170.3a 232.3ab 255.2ab Hexygon 50DF 2 oz. + M-Pede 49% 2 gal. 137.7a 65.2a 36.3c-f 315.5a 217.8ab 116.5b-d Hexygon 50DF 1 oz. + Magus 1.6SC 12 fl. oz. 125.2a 39.0a 14.7e-h 23.7bc 75.5cd 276.7ab Hexygon 50DF 2 oz. + Magus 1.6SC 12 fl. oz. 120.3a 61.0a 27.7d-g 8.3b-d 52.3cd 143.3ab Hexygon 50DF 1 oz. + Magus 1.6SC 16 fl. oz. 80.7a 28.8a 19.8d-h 4.5cd 16.8e 162.5a-c Hexygon 50DF 2 oz. + Magus 1.6SC 16 fl. oz. 108.7a 32.8a 7.2gh 18.5d 29.5de 206.7ab F 1.17 1.39 5.75 22.94 15.74 4.17 14,70 P-value 0.3145 0.1806 <0.0001 <0.0001 <0.0001 <0.0001 Means within a column followed by the same letter are not significantly different by Fisher’s Protected LSD (P=0.05). Data were transformed log (x+1) prior to ANOVA; non-transformed means are presented. a ® A ‘+’ sign indicates the products were combined. All treatments included Induce non-ionic surfactant at 32 fl. oz. per 100 gal. DAT indicates days after treatment.

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2012

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