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CONTROL OF TWOSPOTTED SPIDER MITES ON GREENHOUSE CHRYSANTHEMUM, 1999

CONTROL OF TWOSPOTTED SPIDER MITES ON GREENHOUSE CHRYSANTHEMUM, 1999 (G20) CHRYSANTHEMUM: Dendranthema grandiflora Tzvelev, 'Charm' James F. Price University of Florida-IFAS Gulf Coast Research and Education Center 5007 60th Street East Bradenton, FL 34203 Tel: (941) 751-7636 ext. 246 Fax: (941) 751-7639 Jprice@mail.ifas.ufl.edu Elzie McCord Jr New College of Florida 5700 Tamiami Trail Sarasota, FL 34243-2197 Tel: (941) 359-4646 Fax: (941) 359-4396 Emccord@ncf.edu Twospotted spider mite (TSSM): Tetranychus urticae (Koch) Four miticides were evaluated for control of the twospotted spider mite (TSSM) on greenhouse chrysanthemums at Gulf Coast Research and Education Center, Bradenton, FL in two experiments conducted similarly. Seventy-two 6-wk-old 'Charm' chrysanthemums were pinched to four stems and grown in 6-inch pots. They were infested with 25 TSSM, of mixed stages, per leaf on eight leaves per plant. Two (experiment 1) or 5 (experiment 2) days later, three plants per plot were treated with Floramite 50 WP at 2 and 4 oz, Avid 0.15 EC at 4 fl oz, Sanmite 75 WP at 4 oz and Talstar 0.67 F at 40 fl oz/100 gal. Treatments were applied once using a hand held sprayer with a spray wand outfitted with a nozzle containing a 45° core and a number 4 disc and powered by compressed CO operating at 60 psi and calibrated to deliver 100 gpa of pots spaced according to production practices. Each treatment was replicated four times in a RCB design. Immediately prior to the application and weekly for 3 or 4 wk thereafter, three fully developed leaves per plot were removed at random, excluding the very lowest three leaves, for analysis. Numbers of motile TSSM were counted and recorded. Data were transformed square root (x + 0.5) prior to ANOVA and means were separated by LSD (P = 0.05). Data were retransformed to the original scale for reporting. All products provided significant control of TSSM throughout the 4 wk of evaluation compared to the untreated check and there were no differences in levels of control 3 and 4 wk after treatment (Tables 1 and 2). No visible effects of phytotoxicity were noted. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

CONTROL OF TWOSPOTTED SPIDER MITES ON GREENHOUSE CHRYSANTHEMUM, 1999

Price, James F.; McCord, Elzie
Arthropod Management Tests , Volume 28 (1) – Jan 1, 2003
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Oxford University Press
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© Published by Oxford University Press.
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2155-9856
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10.1093/amt/28.1.G20
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Abstract

(G20) CHRYSANTHEMUM: Dendranthema grandiflora Tzvelev, 'Charm' James F. Price University of Florida-IFAS Gulf Coast Research and Education Center 5007 60th Street East Bradenton, FL 34203 Tel: (941) 751-7636 ext. 246 Fax: (941) 751-7639 Jprice@mail.ifas.ufl.edu Elzie McCord Jr New College of Florida 5700 Tamiami Trail Sarasota, FL 34243-2197 Tel: (941) 359-4646 Fax: (941) 359-4396 Emccord@ncf.edu Twospotted spider mite (TSSM): Tetranychus urticae (Koch) Four miticides were evaluated for control of the twospotted spider mite (TSSM) on greenhouse chrysanthemums at Gulf Coast Research and Education Center, Bradenton, FL in two experiments conducted similarly. Seventy-two 6-wk-old 'Charm' chrysanthemums were pinched to four stems and grown in 6-inch pots. They were infested with 25 TSSM, of mixed stages, per leaf on eight leaves per plant. Two (experiment 1) or 5 (experiment 2) days later, three plants per plot were treated with Floramite 50 WP at 2 and 4 oz, Avid 0.15 EC at 4 fl oz, Sanmite 75 WP at 4 oz and Talstar 0.67 F at 40 fl oz/100 gal. Treatments were applied once using a hand held sprayer with a spray wand outfitted with a nozzle containing a 45° core and a number 4 disc and powered by compressed CO operating at 60 psi and calibrated to deliver 100 gpa of pots spaced according to production practices. Each treatment was replicated four times in a RCB design. Immediately prior to the application and weekly for 3 or 4 wk thereafter, three fully developed leaves per plot were removed at random, excluding the very lowest three leaves, for analysis. Numbers of motile TSSM were counted and recorded. Data were transformed square root (x + 0.5) prior to ANOVA and means were separated by LSD (P = 0.05). Data were retransformed to the original scale for reporting. All products provided significant control of TSSM throughout the 4 wk of evaluation compared to the untreated check and there were no differences in levels of control 3 and 4 wk after treatment (Tables 1 and 2). No visible effects of phytotoxicity were noted.

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Arthropod Management Tests – Oxford University Press

Published: Jan 1, 2003

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