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TWOSPOTTED SPIDER MITE CONTROL ON STAKED TOMATOES, 2006

TWOSPOTTED SPIDER MITE CONTROL ON STAKED TOMATOES, 2006 (E64) TOMATO: Lycoperiscon esculentum Miller ‘Crista’ J. F. Walgenbach Mountain Horticultural Crops Research and Extension Center 455 Research Drive Fletcher, NC 28732 (828) 684-3562 Fax: (828) 684-8715 Email: jim_walgenbach@ncsu.edu S. C. Schoof Twospotted spider mite (TSSM): Tetranychus urticae (Koch) Five-week-old transplants were set 1.5 ft apart in black plastic mulch on 15 Jun in single-row, 20-ft long plots on 10-ft centers. Each treatment was replicated four times in a RCBD. One week before field planting, transplants were infested with TSSM from a laboratory colony maintained on bush beans. To encourage mite populations to build up, all treatments were sprayed weekly during the first four weeks after planting with Sevin 50WP (2 lb/acre). In addition, all plots were treated with Admire Pro (10 oz/acre) as a post-planting drench application. The ORD 400 treatments were applied preventively at approximately weekly intervals, while all other treatments were applied at a threshold of approximately 10 mites per leaflet. All treatments were applied with a tractor-mounted boom sprayer delivering 95 gpa through 7 nozzles per row (6 drop nozzles and 1 overhead nozzle). Mite populations were monitored by observing 10 terminal leaflets (from the most recently expanded leaf) per plot with a 10X visor lens and recording the number of motile TSSM. Mite days were calculated by multiplying the mean mite density on successive sample dates by the sample interval (days). All data were transformed (either square root or log transformation) and subjected to ANOVA, and means were separated by LSD (P = 0.05). Means are presented as non-transformed values. Typical of TSSM populations on tomato, population growth exhibited a near exponential growth rate. In the check, densities remained below 1 mite per leaflet until late Jul, but then quickly increased to > 150 per leaflet by 21 Aug, after which they declined to an average of 48 per leaflet on 5 Sep. Preventive applications of ORD 400 suppressed and delayed the buildup of mites compared with the control; populations in ORD treatments peaked about one week later than the control and were significantly lower than the control on all sample dates after 25 Jul. Comparison of mite-day accumulations showed that the suppressive effect of ORD 400 mite populations was comparable to two curative applications of Danitol and Vydate. The curative application of other miticide treatments was made on 3 Aug; however, 0.25” of rain fell within one hour of this application, and the absence of effective control with any of the treatments by 7 Aug indicated that material had likely washed off of leaf surfaces. Counts taken one week later on 14 Aug showed that all treatments effectively reduced mites below that of the check, with Agri-Mek, both Acramite treatments, Oberon and Danitol most effective and not significantly different from one another (Table 1). TSSM populations rebounded in Oberon, Danitol and Vydate treatments by 18 Aug (15 days after application) when a second application of these treatments was made. Oberon was most effective following the 18 Aug application, but mite populations increased to > 20 mites per leaflet in all treatments 28 Aug. Mites per leaflet Total Treatment Rate/acre Applic. Date 19-Jul 25-Jul 1-Aug 7-Aug 14-Aug 18-Aug 21-Aug 24-Aug 28-Aug 5-Sep Mite-days ORD 400 2.6 oz/gal 7/14, 7/21, 7/28, 8/3, 0.4a 0.8a 0.7a 8.8a 8.2c 36.7c 27.0c 52.4bc 41.4bc 39.4cd 911.5cd 8/8, 8/18, 8/25 ORD 400 5.2 oz/gal 7/14, 7/21, 7/28, 8/3, 0.2a 0.2a 2.1ab 11.6ab 10.0c 39.6c 22.7bc 44.3bc 28.8ab 31.6bcd 806.0cd 8/8, 8/18, 8/25 Agri-Mek 0.15EC 10 oz 8/3, 8/8, 1.0a 1.6a 17.2c 16.6abc 0.2a 1.8a 1.3ab 5.1a 6.5a 1.9a 308.8ab Acramite 50WS 1 lb 8/3, 8/8, 0.5a 2.0a 7.8bc 17.5abc 0.1a 2.7a 1.1a 4.4a 5.3a 2.6a 249.4a + Kenetic 16 oz Acramite 50WS 1 lb 8/3, 8/8, 0.7a 1.7a 11.3bc 21.1abc 0.1a 5.4a 2.2abc 5.3a 9.9ab 4.6a 345.5ab + Kenetic 16 oz + Choice 2 pts Oberon 2SC 7 oz 8/3, 8/8, 8/18 0.6a 2.3a 10.7bc 20.0abc 2.1ab 8.9ab 4.4abc 9.3a 20.5ab 20.1b 507.8bc Danitol 2.4EC 10.6 oz 8/3, 8/8, 8/18 0.6a 2.8a 7.3bc 26.2bc 1.6a 22.9bc 25.8bc 33.0b 34.4bc 29.6bc 844.1cd Vydate 2L 4 pts 8/3, 8/8, 8/18 0.6a 3.7a 8.0bc 21.8bc 6.7bc 34.6c 16.8abc 47.6bc 44.6bc 48.1cd 1054.1d Check 0.5a 2.6a 15.7c 27.8c 51.2d 82.6d 150.3d 70.9c 60.0c 48.3d 2125.6e Approximately 0.25” of rain occurred within 30 minutes of the 8/3 application, and due to high counts on 8/7, all materials were reapplied on 8/18. Means in the same column followed by the same letter are not significantly different by LSD (p > 0.05) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

TWOSPOTTED SPIDER MITE CONTROL ON STAKED TOMATOES, 2006

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Oxford University Press
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2155-9856
DOI
10.1093/amt/32.1.E64
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Abstract

(E64) TOMATO: Lycoperiscon esculentum Miller ‘Crista’ J. F. Walgenbach Mountain Horticultural Crops Research and Extension Center 455 Research Drive Fletcher, NC 28732 (828) 684-3562 Fax: (828) 684-8715 Email: jim_walgenbach@ncsu.edu S. C. Schoof Twospotted spider mite (TSSM): Tetranychus urticae (Koch) Five-week-old transplants were set 1.5 ft apart in black plastic mulch on 15 Jun in single-row, 20-ft long plots on 10-ft centers. Each treatment was replicated four times in a RCBD. One week before field planting, transplants were infested with TSSM from a laboratory colony maintained on bush beans. To encourage mite populations to build up, all treatments were sprayed weekly during the first four weeks after planting with Sevin 50WP (2 lb/acre). In addition, all plots were treated with Admire Pro (10 oz/acre) as a post-planting drench application. The ORD 400 treatments were applied preventively at approximately weekly intervals, while all other treatments were applied at a threshold of approximately 10 mites per leaflet. All treatments were applied with a tractor-mounted boom sprayer delivering 95 gpa through 7 nozzles per row (6 drop nozzles and 1 overhead nozzle). Mite populations were monitored by observing 10 terminal leaflets (from the most recently expanded leaf) per plot with a 10X visor lens and recording the number of motile TSSM. Mite days were calculated by multiplying the mean mite density on successive sample dates by the sample interval (days). All data were transformed (either square root or log transformation) and subjected to ANOVA, and means were separated by LSD (P = 0.05). Means are presented as non-transformed values. Typical of TSSM populations on tomato, population growth exhibited a near exponential growth rate. In the check, densities remained below 1 mite per leaflet until late Jul, but then quickly increased to > 150 per leaflet by 21 Aug, after which they declined to an average of 48 per leaflet on 5 Sep. Preventive applications of ORD 400 suppressed and delayed the buildup of mites compared with the control; populations in ORD treatments peaked about one week later than the control and were significantly lower than the control on all sample dates after 25 Jul. Comparison of mite-day accumulations showed that the suppressive effect of ORD 400 mite populations was comparable to two curative applications of Danitol and Vydate. The curative application of other miticide treatments was made on 3 Aug; however, 0.25” of rain fell within one hour of this application, and the absence of effective control with any of the treatments by 7 Aug indicated that material had likely washed off of leaf surfaces. Counts taken one week later on 14 Aug showed that all treatments effectively reduced mites below that of the check, with Agri-Mek, both Acramite treatments, Oberon and Danitol most effective and not significantly different from one another (Table 1). TSSM populations rebounded in Oberon, Danitol and Vydate treatments by 18 Aug (15 days after application) when a second application of these treatments was made. Oberon was most effective following the 18 Aug application, but mite populations increased to > 20 mites per leaflet in all treatments 28 Aug. Mites per leaflet Total Treatment Rate/acre Applic. Date 19-Jul 25-Jul 1-Aug 7-Aug 14-Aug 18-Aug 21-Aug 24-Aug 28-Aug 5-Sep Mite-days ORD 400 2.6 oz/gal 7/14, 7/21, 7/28, 8/3, 0.4a 0.8a 0.7a 8.8a 8.2c 36.7c 27.0c 52.4bc 41.4bc 39.4cd 911.5cd 8/8, 8/18, 8/25 ORD 400 5.2 oz/gal 7/14, 7/21, 7/28, 8/3, 0.2a 0.2a 2.1ab 11.6ab 10.0c 39.6c 22.7bc 44.3bc 28.8ab 31.6bcd 806.0cd 8/8, 8/18, 8/25 Agri-Mek 0.15EC 10 oz 8/3, 8/8, 1.0a 1.6a 17.2c 16.6abc 0.2a 1.8a 1.3ab 5.1a 6.5a 1.9a 308.8ab Acramite 50WS 1 lb 8/3, 8/8, 0.5a 2.0a 7.8bc 17.5abc 0.1a 2.7a 1.1a 4.4a 5.3a 2.6a 249.4a + Kenetic 16 oz Acramite 50WS 1 lb 8/3, 8/8, 0.7a 1.7a 11.3bc 21.1abc 0.1a 5.4a 2.2abc 5.3a 9.9ab 4.6a 345.5ab + Kenetic 16 oz + Choice 2 pts Oberon 2SC 7 oz 8/3, 8/8, 8/18 0.6a 2.3a 10.7bc 20.0abc 2.1ab 8.9ab 4.4abc 9.3a 20.5ab 20.1b 507.8bc Danitol 2.4EC 10.6 oz 8/3, 8/8, 8/18 0.6a 2.8a 7.3bc 26.2bc 1.6a 22.9bc 25.8bc 33.0b 34.4bc 29.6bc 844.1cd Vydate 2L 4 pts 8/3, 8/8, 8/18 0.6a 3.7a 8.0bc 21.8bc 6.7bc 34.6c 16.8abc 47.6bc 44.6bc 48.1cd 1054.1d Check 0.5a 2.6a 15.7c 27.8c 51.2d 82.6d 150.3d 70.9c 60.0c 48.3d 2125.6e Approximately 0.25” of rain occurred within 30 minutes of the 8/3 application, and due to high counts on 8/7, all materials were reapplied on 8/18. Means in the same column followed by the same letter are not significantly different by LSD (p > 0.05)

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2007

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