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EFFICACY OF MITICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITES ON WATERMELON, 2012

EFFICACY OF MITICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITES ON WATERMELON, 2012 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E76 (E76) WATERMELON: Cirullis lantus (Thunberg), ‘Sangria’ Joanne Whalen University of Delaware 531 South College Avenue Newark, DE 19716 Phone: 302-831-1303 Fax: 302-831-8889 E-mail: jwhalen@udel.edu Bill Cissel E-mail: bcissel@udel.edu Twospotted spider mite (TSM): Tetranychus urticae Koch The objective of the experiment was to evaluate the effectiveness of foliar miticides for control of TSM on Watermelon. ‘Sangria’ watermelons were transplanted on 25 May at the University of Delaware Research and Education Center located near Georgetown, Delaware. Plots were two rows wide and 20ft long, planted on 7ft centers. Each treatment was replicated 4 times and arranged in a RCB design. Foliar treatments were applied on 15 Jun and 18 Jul using a CO pressurized back pack sprayer. The 15 Jun treatments were applied with a 3 nozzle boom equipped with XR 8002 tips, delivering 27.6 gpa at 40 psi. The 18 Jul application was made using a 5 nozzle boom equipped with XR 8002 tips, delivering 18.4 gpa at 40 psi. The percent infested plants and TSM populations were determined by counting the number of adult and immature TSM per 50 leaves from 10 randomly-selected plants per plot. The number of TSM infested plants was recorded from 29 May through 27 Jun for the first application and on 16 Jul and 23 Jul for the second application. Data were analyzed using Proc GLM, and means were separated by Tukey’s mean separation test (P=0.05). TSM pressure was moderate at the time of the first application and high at the time of the second application. Although treatments did not statistically separate out after either application date, the following trends were observed. After the first application date 15 Jun, the Sniper and Hero treatments had a numerically higher percentage of infested plants at 7 and 12 DAT1 (Table 1). The mean number of TSM per 50 leaves at 7 DAT1 was also numerically higher for the Sniper and Hero treatments compared to the other treatments (Table 2). After the second application date, 18 Jul the Zeal, Agri-Mek and Portal treatments had a numerically lower number of TSM per 50 leaves at 5 DAT2 compared to the Oberon, Sniper and Hero treatments (Table 3). No phytoxicity was observed. This research was supported by industry gifts. Table 1. Mean Percent TSM Infested Plants 11 Jun 18 Jun 22 Jun 27 Jun Treatment/formulation Rate/acre (Pre-Trt) (3 DAT1) (7 DAT1) (12 DAT1) Oberon 2SC 8.5 oz 17.50a 10.00a 2.50a 0.00a Sniper 6.4 oz 12.50a 15.00a 10.00a 10.00a Hero EC 10.3 oz 12.50a 25.00a 20.00a 7.50a Zeal WSP + LI-700 2 oz + 0.25% v/v 10.00a 22.50a 7.50a 0.00a Zeal WSP + LI-700 3 oz + 0.25% v/v 5.00a 22.50a 0.00a 0.00a Agri-Mek 0.15 EC + LI-700 16 oz + 0.25% v/v 10.00a 27.50a 5.00a 0.00a Portal 2 pts 10.00a 12.50a 7.50a 0.00a Untreated check -- 15.00a 27.50a 12.50a 2.50a Means in the same columns followed by the same letter are not significantly different (Tukey’s; P=0.05). 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E76 Table 2. Mean No. of TSM per 50 Leaves 11 Jun 18 Jun 22 Jun 27 Jun Treatment/formulation Rate/Acre (Pre-Trt) (3 DAT1) (7 DAT1) (12 DAT1) Oberon 2SC 8.5 oz 25.00a 1.50a 1.50a 0.00b Sniper 6.4 oz 4.00a 14.75a 6.75a 10.75a Hero EC 10.3 oz 6.25a 22.75 a 12.75a 2.00ab Zeal WSP + LI-700 2 oz + 0.25% v/v 48.50a 7.50a 0.00a 2.00ab Zeal WSP + LI-700 3 oz + 0.25% v/v 0.75a 22.50a 0.75a 0.00b Agri-Mek 0.15 EC + LI-700 16 oz + 0.25% v/v 3.00a 16.75a 0.00a 0.00b Portal 2 pts 10.50a 2.50a 0.50a 0.00b Untreated -- 172.75a 36.50a 15.25a 2.75ab Means in the same columns followed by the same letter are not significantly different ( Tukey’s; P=0.05). Table 3. Mean Percent TSM Infested Mean No. TSM per 50 Plants Leaves 16 Jul 23 Jul 16 Jul 23 Jul Treatment/formulation Rate/Acre (Pre-Trt) (5 DAT2) (Pre-Trt) (5 DAT2) Oberon 2SC 8.5 oz 25.00ab 56.67a 140.5a 111.50a Sniper 6.4 oz 45.00a 63.33a 479.8a 408.00a Hero EC 10.3 oz 37.50ab 63.33a 341.3a 636.3a Zeal WSP + LI-700 2 oz + 0.25% v/v 10.00b 10.00a 1.50a 11.30a Zeal WSP + LI-700 3 oz + 0.25% v/v 17.50ab 26.67a 11.50a 25.00a Agri-Mek 0.15 EC + LI-700 16 oz + 0.25% v/v 10.00b 26.67a 4.80a 7.50a Portal 2 pts 20.00ab 23.33a 17.80a 17.50a Untreated -- 45.00a 63.33a 230.00a 460.50a Means in the same columns followed by the same letter are not significantly different (Tukey’s; P=0.05). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EFFICACY OF MITICIDES FOR CONTROL OF TWOSPOTTED SPIDER MITES ON WATERMELON, 2012

Whalen, Joanne; Cissel, Bill
Arthropod Management Tests , Volume 38 (1) – Jan 1, 2013
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Oxford University Press
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2155-9856
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10.4182/amt.2013.E76
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Abstract

Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E76 (E76) WATERMELON: Cirullis lantus (Thunberg), ‘Sangria’ Joanne Whalen University of Delaware 531 South College Avenue Newark, DE 19716 Phone: 302-831-1303 Fax: 302-831-8889 E-mail: jwhalen@udel.edu Bill Cissel E-mail: bcissel@udel.edu Twospotted spider mite (TSM): Tetranychus urticae Koch The objective of the experiment was to evaluate the effectiveness of foliar miticides for control of TSM on Watermelon. ‘Sangria’ watermelons were transplanted on 25 May at the University of Delaware Research and Education Center located near Georgetown, Delaware. Plots were two rows wide and 20ft long, planted on 7ft centers. Each treatment was replicated 4 times and arranged in a RCB design. Foliar treatments were applied on 15 Jun and 18 Jul using a CO pressurized back pack sprayer. The 15 Jun treatments were applied with a 3 nozzle boom equipped with XR 8002 tips, delivering 27.6 gpa at 40 psi. The 18 Jul application was made using a 5 nozzle boom equipped with XR 8002 tips, delivering 18.4 gpa at 40 psi. The percent infested plants and TSM populations were determined by counting the number of adult and immature TSM per 50 leaves from 10 randomly-selected plants per plot. The number of TSM infested plants was recorded from 29 May through 27 Jun for the first application and on 16 Jul and 23 Jul for the second application. Data were analyzed using Proc GLM, and means were separated by Tukey’s mean separation test (P=0.05). TSM pressure was moderate at the time of the first application and high at the time of the second application. Although treatments did not statistically separate out after either application date, the following trends were observed. After the first application date 15 Jun, the Sniper and Hero treatments had a numerically higher percentage of infested plants at 7 and 12 DAT1 (Table 1). The mean number of TSM per 50 leaves at 7 DAT1 was also numerically higher for the Sniper and Hero treatments compared to the other treatments (Table 2). After the second application date, 18 Jul the Zeal, Agri-Mek and Portal treatments had a numerically lower number of TSM per 50 leaves at 5 DAT2 compared to the Oberon, Sniper and Hero treatments (Table 3). No phytoxicity was observed. This research was supported by industry gifts. Table 1. Mean Percent TSM Infested Plants 11 Jun 18 Jun 22 Jun 27 Jun Treatment/formulation Rate/acre (Pre-Trt) (3 DAT1) (7 DAT1) (12 DAT1) Oberon 2SC 8.5 oz 17.50a 10.00a 2.50a 0.00a Sniper 6.4 oz 12.50a 15.00a 10.00a 10.00a Hero EC 10.3 oz 12.50a 25.00a 20.00a 7.50a Zeal WSP + LI-700 2 oz + 0.25% v/v 10.00a 22.50a 7.50a 0.00a Zeal WSP + LI-700 3 oz + 0.25% v/v 5.00a 22.50a 0.00a 0.00a Agri-Mek 0.15 EC + LI-700 16 oz + 0.25% v/v 10.00a 27.50a 5.00a 0.00a Portal 2 pts 10.00a 12.50a 7.50a 0.00a Untreated check -- 15.00a 27.50a 12.50a 2.50a Means in the same columns followed by the same letter are not significantly different (Tukey’s; P=0.05). 1 Arthropod Management Tests 2013, Vol. 38 doi: 10.4182/amt.2013.E76 Table 2. Mean No. of TSM per 50 Leaves 11 Jun 18 Jun 22 Jun 27 Jun Treatment/formulation Rate/Acre (Pre-Trt) (3 DAT1) (7 DAT1) (12 DAT1) Oberon 2SC 8.5 oz 25.00a 1.50a 1.50a 0.00b Sniper 6.4 oz 4.00a 14.75a 6.75a 10.75a Hero EC 10.3 oz 6.25a 22.75 a 12.75a 2.00ab Zeal WSP + LI-700 2 oz + 0.25% v/v 48.50a 7.50a 0.00a 2.00ab Zeal WSP + LI-700 3 oz + 0.25% v/v 0.75a 22.50a 0.75a 0.00b Agri-Mek 0.15 EC + LI-700 16 oz + 0.25% v/v 3.00a 16.75a 0.00a 0.00b Portal 2 pts 10.50a 2.50a 0.50a 0.00b Untreated -- 172.75a 36.50a 15.25a 2.75ab Means in the same columns followed by the same letter are not significantly different ( Tukey’s; P=0.05). Table 3. Mean Percent TSM Infested Mean No. TSM per 50 Plants Leaves 16 Jul 23 Jul 16 Jul 23 Jul Treatment/formulation Rate/Acre (Pre-Trt) (5 DAT2) (Pre-Trt) (5 DAT2) Oberon 2SC 8.5 oz 25.00ab 56.67a 140.5a 111.50a Sniper 6.4 oz 45.00a 63.33a 479.8a 408.00a Hero EC 10.3 oz 37.50ab 63.33a 341.3a 636.3a Zeal WSP + LI-700 2 oz + 0.25% v/v 10.00b 10.00a 1.50a 11.30a Zeal WSP + LI-700 3 oz + 0.25% v/v 17.50ab 26.67a 11.50a 25.00a Agri-Mek 0.15 EC + LI-700 16 oz + 0.25% v/v 10.00b 26.67a 4.80a 7.50a Portal 2 pts 20.00ab 23.33a 17.80a 17.50a Untreated -- 45.00a 63.33a 230.00a 460.50a Means in the same columns followed by the same letter are not significantly different (Tukey’s; P=0.05).

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Published: Jan 1, 2013

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