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EFFICACY OF MITICIDES FOR LATE SEASON CONTROL OF TWOSPOTTED SPIDER MITE IN STRAWBERRY, 2004

EFFICACY OF MITICIDES FOR LATE SEASON CONTROL OF TWOSPOTTED SPIDER MITE IN STRAWBERRY, 2004 (C17) STRAWBERRY: Fragaria x ananassa Duchesne, ‘Camarosa’ EFFICACY OF MITICIDES FOR LATE SEASON CONTROL OF TWOSPOTTED SPIDER MITE IN STRAWBERRY, 2004 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 E-mail: jprice@mail.ifas.ufl.edu Curtis A. Nagle E-mail: cnagle@mail.ifas.ufl.edu Twospotted spider mite (TSSM): Tetranychus urticae (Koch) The efficacies of 12 miticides, applied in various combinations or sequences on TSSM in late season strawberry, were evaluated at the Gulf Coast Research and Education Center (GCREC), Dover, FL in the spring of 2004. ‘Camarosa’ strawberry plants were set on 4 Oct 2003 and were infested from a laboratory colony with between 50 and 100 TSSM per plant each day on 8, 10, and 15 Mar to ensure high population densities on the mature plants. The colony was established four months earlier from TSSM taken from strawberry transplants shipped to the experimental farm, and was reared on bush lima beans. Treatments were included in a RCB design with four replications on plastic mulch covered beds. The beds were spaced 4 ft apart and were 13 inches high and 27 inches across the top. Each plot consisted of 20 plants in two 10-plant rows per bed. All treatments were started on 25 Mar, except Savey which was applied 10 days earlier (Table 1). Treatments were applied using a hand-held sprayer with a spray wand outfitted with a nozzle containing a 45-degree core and a number 4 disc, pressurized by CO to 40 psi, and calibrated to deliver 200 gpa. When a treatment application and a sample were scheduled on the same day, the sample was taken before any treatment was applied. Ten randomly selected leaflets per plot were collected from the middle one-third stratum of plants in the Savey treated and the untreated check plots on 12 Mar and from all plots on 22 Mar to provide a pre-treatment sample. Sampling of all plots continued weekly through 26 Apr. at which time the experiment was terminated because uncontrolled predatory mites became numerous and began to reduce spider mite densities. Samples were transported to the laboratory where motile and egg TSSM were brushed from the leaflets onto rotating sticky disks and counted on 10% of the disk surface to estimate average numbers per leaflet. Data were transformed log (x+1) prior to ANOVA and means were separated by Fisher’s Protected LSD (P ≤ 0.05). Non- transformed data are reported. Pre-treatment TSSM densities in untreated check plots and plots to be treated with Savey were about one motile per leaflet on 12 Mar. Ten days later, and prior to the beginning of applications of the remaining treatments, TSSM densities in all plots were close to or higher than 20 motiles per leaflet. At that time there were no significant differences between mean densities of the untreated check and any of the chemical treatments. Two wks after the start of treatment applications (5 Apr) all treatments, except Satisfy Yield Enhancer, resulted in significantly fewer motile TSSM compared to the untreated check (Table 2). The same was true for egg densities with the exceptions of the ovicide treatments, Zeal and Savey by themselves (Table 3). Motile TSSM densities among all treatments, except Satisfy Yield Enhancer and Nexter, were significantly lower than those of the untreated check at the final sample, about four wks after most treatments began. At that time, plants treated with Acramite followed by Vendex, Kanemite without Joint Venture, Savey plus Mesa, Savey plus Acramite, or Oberon applied twice at 16 fl oz/acre had mean motile TSSM densities less than six per leaflet (Table 2). No phytotoxicity was observed on any of the plants in this study. Table 1. Date of treatment application Treatment/ Rate formulation amt product/acre 15 Mar 25 Mar 30 Mar 5 Apr 19 Apr Untreated check -- -- -- -- -- -- Agri-Mek 0.15EC 16 fl oz X X X FujiMite 5% EC 32 fl oz X X X Acramite 50WS 1 lb + Joint Venture + 1 pt X Acramite 75WG 0.66 lb + Joint Venture + 1 pt X Acramite 50WS 1 lb + Joint Venture + 1 pt X X Acramite 50WS 1 lb + Joint Venture + 1 pt X X & Vendex 50WP 2 lb + Joint Venture + 1 pt X Kanemite 15% SC 31 fl oz X X Kanemite 15% SC 31 fl oz + Joint Venture + 1 pt X X Zeal 72WDG 2 oz X & Danitol 2.4EC 16 fl oz X Zeal 72WDG 3 oz X & Danitol 2.4EC 16 fl oz X Satisfy Yield Enhancer 12 fl oz X X X Nexter 75WP 6.6 oz X X Savey 50DF 6 oz X Savey 50DF 6 oz + Mesa 0.0775EC + 32 fl oz X Savey 50DF 6 oz + Acramite 50WS + 1 lb X Oberon 2SC 8.5 fl oz X X Oberon 2SC 16 fl oz X X A “+” indicates the products were combined, while “&” indicates the products were applied separately as shown in this table. Table 2. Motile TSSM/leaflet Treatment/ Rate amt formulation product/acre 12 Mar 22 Mar 29 Mar 5 Apr 13 Apr 19 Apr 26 Apr Untreated check -- 0.8a 23.0a 45.3a 95.8a 247.8a 254.8a 82.5a Agri-Mek 0.15EC 16 fl oz 34.0a 29.0a-e 15.5cd 8.0cde 21.0b-e 9.0bcd FujiMite 5% EC 32 fl oz 24.3a 15.8c-f 2.5f 1.3f 6.3e-i 7.3bcd Acramite 50WS 1 lb + Joint Venture + 1 pt 19.3a 24.0a-e 12.5cde 6.8ef 37.3c-f 9.3bcd Acramite 75WG 0.66 lb + Joint Venture + 1 pt 26.0a 9.3def 8.0def 9.0cde 13.0d-g 11.0bcd Acramite 50WS 1 lb + Joint Venture + 1 pt 26.0a 17.0b-f 14.3cd 7.3de 20.5d-h 6.0cde Acramite 50WS 1 lb + Joint Venture + 1 pt & Vendex 50WP 2 lb + Joint Venture + 1 pt 35.0a 25.0a-f 10.0cde 1.5f 3.8ghi 1.3e Kanemite 15% SC 31 fl oz 25.8a 7.5f 9.0de 7.5cde 26.3b-e 4.5cde Kanemite 15% SC 31 fl oz + Joint Venture + 1 pt 17.8a 18.0a-f 30.5bc 18.5bc 36.3bcd 11.3bc Zeal 72WDG 2 oz & Danitol 2.4EC 16 fl oz 37.5a 22.5a-d 11.8cde 11.0cd 12.8d-g 8.0bcd Zeal 72WDG 3 oz & Danitol 2.4EC 16 fl oz 24.8a 13.3c-f 10.8cde 6.5de 10.8d-g 8.3cd Satisfy Yield Enhancer 12 fl oz 26.5a 41.5ab 68.5ab 183.8a 237.0a 87.8a Nexter 75WP 6.6 oz 13.8a 14.3ef 35.3bc 20.0bc 57.0b 198.5a Savey 50DF 6 oz 1.0a 11.8a 9.3def 13.3cd 28.0b 58.8bc 26.0b Savey 50DF 6 oz + Mesa 0.0775EC + 32 fl oz 38.0a 26.5abc 6.8def 4.5de 3.0hi 5.3cde Savey 50DF 6 oz + Acramite 50WS + 1 lb 26.0a 15.5c-f 17.5cde 8.8cde 5.3f-i 3.3de Oberon 2SC 8.5 fl oz 20.0a 13.3c-f 6.3ef 3.0ef 3.8i 13.8bcd Oberon 2SC 16 fl oz 14.8a 10.3c-f 8.0de 1.0f 2.5i 2.8cde F 0.05 (F ) 0.84 2.30 5.85 17.95 10.70 9.93 17, 51 1, 3 P-value 0.839 0.640 0.011 <0.001 <0.001 <0.001 <0.001 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 analysis; non-transformed data are presented. A “+” indicates the products were combined, while “&”indicates the products were applied separately as shown in Table 1. This Acramite + Joint Venture treatment was applied once. This Acramite + Joint Venture treatment was applied twice. Table 3. Egg TSSM /leaflet Treatment/ Rate amt formulation product/acre 12 Mar 22 Mar 29 Mar 5 Apr 13 Apr 19 Apr 26 Apr Untreated check -- 2.8a 72.5a 121.5a 194.0a 676.3a 434.8ab 24.0bc Agri-Mek 0.15EC 16 fl oz 64.5a 22.8fg 6.5gh 48.3c-g 48.0d-g 2.3f-i FujiMite 5% EC 32 fl oz 67.5a 34.3d-g 4.3gh 12.0hi 35.8d-h 19.8bcd Acramite 50WS 1 lb + Joint Venture + 1 pt 79.8a 47.5c-f 8.0fgh 34.3gh 45.3fgh 6.3e-i Acramite 75WG 0.66 lb + Joint Venture + 1 pt 59.3a 17.5g 3.3h 35.5d-g 22.5f-i 11.3b-e Acramite 50WS 1 lb + Joint Venture + 1 pt 80.5a 43.3c-f 11.5fgh 50.5efg 38.0fgh 1.0f-i Acramite 50WS 1 lb + Joint Venture + 1 pt & Vendex 50WP 2 lb + Joint Venture + 1 pt 60.5a 32.3efg 14.0efg 6.5ij 6.3ij 0.5hi Kanemite 15% SC 31 fl oz 79.5a 47.5c-f 12.5d-g 49.3c-g 56.8e-h 1.3ghi Kanemite 15% SC 31 fl oz + Joint Venture + 1 pt 45.5a 26.8efg 31.8cde 81.0b-e 100.8c-f 1.3f-i Zeal 72WDG 2 oz & Danitol 2.4EC 16 fl oz 75.3a 112.5ab 104.8ab 122.5bc 157.3a-e 30.3b Zeal 72WDG 3 oz & Danitol 2.4EC 16 fl oz 46.3a 114.0ab 120.5ab 68.8b-f 149.5b-e 42.5b Satisfy Yield Enhancer 12 fl oz 58.5a 129.5a 154.5a 558.8a 612.0a 25.8b Nexter 75WP 6.6 oz 54.5a 52.8b-e 43.5bcd 107.0bcd 316.5abc 447.3a Savey 50DF 6 oz 2.0a 43.3a 82.3abc 67.8abc 144.8b 192.3a-d 6.3c-f Savey 50DF 6 oz + Mesa 0.0775EC + 32 fl oz 79.0a 62.3a-d 20.5def 37.0fgh 15.3hij 4.5d-h Savey 50DF 6 oz + Acramite 50WS + 1 lb 52.5a 41.8d-g 21.5d-g 43.8e-h 19.8g-j 11.5d-g Oberon 2SC 8.5 fl oz 102.0a 49.5b-e 4.8h 4.3jk 2.3j 38.8d-h Oberon 2SC 16 fl oz 38.8a 25.0efg 5.5gh 1.8k 2.5j 0.0i F 0.07 (F ) 0.82 5.11 11.33 18.55 9.18 10.10 17, 51 1, 3 P-value 0.812 0.660 <0.001 <0.001 <0.001 <0.001 <0.001 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 analysis; non-transformed data are presented. A “+” indicates the products were combined, while “&”indicates the products were applied separately as shown in Table 1. This Acramite + Joint Venture treatment was applied once. This Acramite + Joint Venture treatment was applied twice. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EFFICACY OF MITICIDES FOR LATE SEASON CONTROL OF TWOSPOTTED SPIDER MITE IN STRAWBERRY, 2004

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(C17) STRAWBERRY: Fragaria x ananassa Duchesne, ‘Camarosa’ EFFICACY OF MITICIDES FOR LATE SEASON CONTROL OF TWOSPOTTED SPIDER MITE IN STRAWBERRY, 2004 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 E-mail: jprice@mail.ifas.ufl.edu Curtis A. Nagle E-mail: cnagle@mail.ifas.ufl.edu Twospotted spider mite (TSSM): Tetranychus urticae (Koch) The efficacies of 12 miticides, applied in various combinations or sequences on TSSM in late season strawberry, were evaluated at the Gulf Coast Research and Education Center (GCREC), Dover, FL in the spring of 2004. ‘Camarosa’ strawberry plants were set on 4 Oct 2003 and were infested from a laboratory colony with between 50 and 100 TSSM per plant each day on 8, 10, and 15 Mar to ensure high population densities on the mature plants. The colony was established four months earlier from TSSM taken from strawberry transplants shipped to the experimental farm, and was reared on bush lima beans. Treatments were included in a RCB design with four replications on plastic mulch covered beds. The beds were spaced 4 ft apart and were 13 inches high and 27 inches across the top. Each plot consisted of 20 plants in two 10-plant rows per bed. All treatments were started on 25 Mar, except Savey which was applied 10 days earlier (Table 1). Treatments were applied using a hand-held sprayer with a spray wand outfitted with a nozzle containing a 45-degree core and a number 4 disc, pressurized by CO to 40 psi, and calibrated to deliver 200 gpa. When a treatment application and a sample were scheduled on the same day, the sample was taken before any treatment was applied. Ten randomly selected leaflets per plot were collected from the middle one-third stratum of plants in the Savey treated and the untreated check plots on 12 Mar and from all plots on 22 Mar to provide a pre-treatment sample. Sampling of all plots continued weekly through 26 Apr. at which time the experiment was terminated because uncontrolled predatory mites became numerous and began to reduce spider mite densities. Samples were transported to the laboratory where motile and egg TSSM were brushed from the leaflets onto rotating sticky disks and counted on 10% of the disk surface to estimate average numbers per leaflet. Data were transformed log (x+1) prior to ANOVA and means were separated by Fisher’s Protected LSD (P ≤ 0.05). Non- transformed data are reported. Pre-treatment TSSM densities in untreated check plots and plots to be treated with Savey were about one motile per leaflet on 12 Mar. Ten days later, and prior to the beginning of applications of the remaining treatments, TSSM densities in all plots were close to or higher than 20 motiles per leaflet. At that time there were no significant differences between mean densities of the untreated check and any of the chemical treatments. Two wks after the start of treatment applications (5 Apr) all treatments, except Satisfy Yield Enhancer, resulted in significantly fewer motile TSSM compared to the untreated check (Table 2). The same was true for egg densities with the exceptions of the ovicide treatments, Zeal and Savey by themselves (Table 3). Motile TSSM densities among all treatments, except Satisfy Yield Enhancer and Nexter, were significantly lower than those of the untreated check at the final sample, about four wks after most treatments began. At that time, plants treated with Acramite followed by Vendex, Kanemite without Joint Venture, Savey plus Mesa, Savey plus Acramite, or Oberon applied twice at 16 fl oz/acre had mean motile TSSM densities less than six per leaflet (Table 2). No phytotoxicity was observed on any of the plants in this study. Table 1. Date of treatment application Treatment/ Rate formulation amt product/acre 15 Mar 25 Mar 30 Mar 5 Apr 19 Apr Untreated check -- -- -- -- -- -- Agri-Mek 0.15EC 16 fl oz X X X FujiMite 5% EC 32 fl oz X X X Acramite 50WS 1 lb + Joint Venture + 1 pt X Acramite 75WG 0.66 lb + Joint Venture + 1 pt X Acramite 50WS 1 lb + Joint Venture + 1 pt X X Acramite 50WS 1 lb + Joint Venture + 1 pt X X & Vendex 50WP 2 lb + Joint Venture + 1 pt X Kanemite 15% SC 31 fl oz X X Kanemite 15% SC 31 fl oz + Joint Venture + 1 pt X X Zeal 72WDG 2 oz X & Danitol 2.4EC 16 fl oz X Zeal 72WDG 3 oz X & Danitol 2.4EC 16 fl oz X Satisfy Yield Enhancer 12 fl oz X X X Nexter 75WP 6.6 oz X X Savey 50DF 6 oz X Savey 50DF 6 oz + Mesa 0.0775EC + 32 fl oz X Savey 50DF 6 oz + Acramite 50WS + 1 lb X Oberon 2SC 8.5 fl oz X X Oberon 2SC 16 fl oz X X A “+” indicates the products were combined, while “&” indicates the products were applied separately as shown in this table. Table 2. Motile TSSM/leaflet Treatment/ Rate amt formulation product/acre 12 Mar 22 Mar 29 Mar 5 Apr 13 Apr 19 Apr 26 Apr Untreated check -- 0.8a 23.0a 45.3a 95.8a 247.8a 254.8a 82.5a Agri-Mek 0.15EC 16 fl oz 34.0a 29.0a-e 15.5cd 8.0cde 21.0b-e 9.0bcd FujiMite 5% EC 32 fl oz 24.3a 15.8c-f 2.5f 1.3f 6.3e-i 7.3bcd Acramite 50WS 1 lb + Joint Venture + 1 pt 19.3a 24.0a-e 12.5cde 6.8ef 37.3c-f 9.3bcd Acramite 75WG 0.66 lb + Joint Venture + 1 pt 26.0a 9.3def 8.0def 9.0cde 13.0d-g 11.0bcd Acramite 50WS 1 lb + Joint Venture + 1 pt 26.0a 17.0b-f 14.3cd 7.3de 20.5d-h 6.0cde Acramite 50WS 1 lb + Joint Venture + 1 pt & Vendex 50WP 2 lb + Joint Venture + 1 pt 35.0a 25.0a-f 10.0cde 1.5f 3.8ghi 1.3e Kanemite 15% SC 31 fl oz 25.8a 7.5f 9.0de 7.5cde 26.3b-e 4.5cde Kanemite 15% SC 31 fl oz + Joint Venture + 1 pt 17.8a 18.0a-f 30.5bc 18.5bc 36.3bcd 11.3bc Zeal 72WDG 2 oz & Danitol 2.4EC 16 fl oz 37.5a 22.5a-d 11.8cde 11.0cd 12.8d-g 8.0bcd Zeal 72WDG 3 oz & Danitol 2.4EC 16 fl oz 24.8a 13.3c-f 10.8cde 6.5de 10.8d-g 8.3cd Satisfy Yield Enhancer 12 fl oz 26.5a 41.5ab 68.5ab 183.8a 237.0a 87.8a Nexter 75WP 6.6 oz 13.8a 14.3ef 35.3bc 20.0bc 57.0b 198.5a Savey 50DF 6 oz 1.0a 11.8a 9.3def 13.3cd 28.0b 58.8bc 26.0b Savey 50DF 6 oz + Mesa 0.0775EC + 32 fl oz 38.0a 26.5abc 6.8def 4.5de 3.0hi 5.3cde Savey 50DF 6 oz + Acramite 50WS + 1 lb 26.0a 15.5c-f 17.5cde 8.8cde 5.3f-i 3.3de Oberon 2SC 8.5 fl oz 20.0a 13.3c-f 6.3ef 3.0ef 3.8i 13.8bcd Oberon 2SC 16 fl oz 14.8a 10.3c-f 8.0de 1.0f 2.5i 2.8cde F 0.05 (F ) 0.84 2.30 5.85 17.95 10.70 9.93 17, 51 1, 3 P-value 0.839 0.640 0.011 <0.001 <0.001 <0.001 <0.001 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 analysis; non-transformed data are presented. A “+” indicates the products were combined, while “&”indicates the products were applied separately as shown in Table 1. This Acramite + Joint Venture treatment was applied once. This Acramite + Joint Venture treatment was applied twice. Table 3. Egg TSSM /leaflet Treatment/ Rate amt formulation product/acre 12 Mar 22 Mar 29 Mar 5 Apr 13 Apr 19 Apr 26 Apr Untreated check -- 2.8a 72.5a 121.5a 194.0a 676.3a 434.8ab 24.0bc Agri-Mek 0.15EC 16 fl oz 64.5a 22.8fg 6.5gh 48.3c-g 48.0d-g 2.3f-i FujiMite 5% EC 32 fl oz 67.5a 34.3d-g 4.3gh 12.0hi 35.8d-h 19.8bcd Acramite 50WS 1 lb + Joint Venture + 1 pt 79.8a 47.5c-f 8.0fgh 34.3gh 45.3fgh 6.3e-i Acramite 75WG 0.66 lb + Joint Venture + 1 pt 59.3a 17.5g 3.3h 35.5d-g 22.5f-i 11.3b-e Acramite 50WS 1 lb + Joint Venture + 1 pt 80.5a 43.3c-f 11.5fgh 50.5efg 38.0fgh 1.0f-i Acramite 50WS 1 lb + Joint Venture + 1 pt & Vendex 50WP 2 lb + Joint Venture + 1 pt 60.5a 32.3efg 14.0efg 6.5ij 6.3ij 0.5hi Kanemite 15% SC 31 fl oz 79.5a 47.5c-f 12.5d-g 49.3c-g 56.8e-h 1.3ghi Kanemite 15% SC 31 fl oz + Joint Venture + 1 pt 45.5a 26.8efg 31.8cde 81.0b-e 100.8c-f 1.3f-i Zeal 72WDG 2 oz & Danitol 2.4EC 16 fl oz 75.3a 112.5ab 104.8ab 122.5bc 157.3a-e 30.3b Zeal 72WDG 3 oz & Danitol 2.4EC 16 fl oz 46.3a 114.0ab 120.5ab 68.8b-f 149.5b-e 42.5b Satisfy Yield Enhancer 12 fl oz 58.5a 129.5a 154.5a 558.8a 612.0a 25.8b Nexter 75WP 6.6 oz 54.5a 52.8b-e 43.5bcd 107.0bcd 316.5abc 447.3a Savey 50DF 6 oz 2.0a 43.3a 82.3abc 67.8abc 144.8b 192.3a-d 6.3c-f Savey 50DF 6 oz + Mesa 0.0775EC + 32 fl oz 79.0a 62.3a-d 20.5def 37.0fgh 15.3hij 4.5d-h Savey 50DF 6 oz + Acramite 50WS + 1 lb 52.5a 41.8d-g 21.5d-g 43.8e-h 19.8g-j 11.5d-g Oberon 2SC 8.5 fl oz 102.0a 49.5b-e 4.8h 4.3jk 2.3j 38.8d-h Oberon 2SC 16 fl oz 38.8a 25.0efg 5.5gh 1.8k 2.5j 0.0i F 0.07 (F ) 0.82 5.11 11.33 18.55 9.18 10.10 17, 51 1, 3 P-value 0.812 0.660 <0.001 <0.001 <0.001 <0.001 <0.001 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 analysis; non-transformed data are presented. A “+” indicates the products were combined, while “&”indicates the products were applied separately as shown in Table 1. This Acramite + Joint Venture treatment was applied once. This Acramite + Joint Venture treatment was applied twice.

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2006

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