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EVALUATION OF SOIL APPLIED INSECTICIDES FOR CONTROL OF WIREWORM IN POTATOES, 2011 B

EVALUATION OF SOIL APPLIED INSECTICIDES FOR CONTROL OF WIREWORM IN POTATOES, 2011 B Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E53 (E53) POTATO: Solanum tuberosum L., ‘Atlantic’ Kevin W. Langdon Department of Entomology North Carolina State University Campus Box 7630 Raleigh, NC 27695 Phone: 919-515-1657 Fax: 919-515-3748 E-mail: kevin_langdon@ncsu.edu Mark R. Abney E-mail: mark_abney@ncsu.edu Corn wireworm (CW): Melanotus communis (Gyllenhall) The purpose of this experiment was to evaluate the efficacy of soil applied insecticides for control of CW in potato at the Tidewater Research Station in Plymouth, NC. The trial was arranged in a RCB with 14 treatments and four replicates. Plots were 1 row by 30 ft long planted on 76 inch centers with unplanted guard rows. Seed pieces were planted by hand on 25 Mar 2011 with 9 inch within row spacing and plants were managed according to local standard practices. In-furrow soil insecticides were applied immediately after seed pieces were placed in the furrow and before furrows were closed on 25 Mar. ‘Drag-off’ soil insecticide applications were made on 21 Apr; insecticide was applied to the soil surface directly over the row and incorporated with hilling discs. Thimet was applied as a granular formulation using a handheld granule shaker. All other insecticide applications were applied using a CO powered backpack sprayer with a single nozzle boom equipped with a DC25 core and a D4 disc delivering 15 gpa at 40 psi. Ten linear row ft of each plot was harvested by hand one time weekly for three weeks: 16 Jun, 23 Jun, and 29 Jun. At each harvest, tubers (n=50) were randomly collected from each plot and transported to the lab at NC State in Raleigh, NC. Tubers were washed and evaluated individually for wireworm damage incidence and severity. Treatment means were analyzed using the PROC MIXED in SAS (Version 9.2). Fisher’s LSD was used to separate significantly different means. Percent tuber damage data were arcsine square root transformed prior to analysis; untransformed means are presented here. Moderately dry soil moisture conditions persisted throughout the trial period. Wireworm pressure was high. General levels of percent wireworm damaged tubers and mean number of wireworm holes per tuber increased between harvests. Significant differences between treatments in percent of wireworm damaged tubers (Table 1) and mean number of wireworm holes per tuber (Table 2) were observed on the first harvest and third harvest. This research was supported by industry gifts of pesticide and funding. 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E53 Table 1 % Wireworm Damaged Tubers At Plant Insecticide* At Drag Off First Second Third Treatment/Formulation Rate Insecticide± Rate Harvest Harvest Harvest (acre) Treatment/Formulation (acre) 6/16 6/23 6/29 Untreated Check NA NA NA 43.2ab 45a 64a Brigadier 20 SC 16 fl oz Brigadier 20 SC 6.4 fl oz 26cd 31abcde 35cd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 16 fl oz NA NA 24cd 22de 35cd +Admire Pro 4.6 SC 5.2 fl oz Brigadier 20 SC 12 fl oz Brigadier 20 SC 12 fl oz 22.8cd 25bcde 44bcd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 12 fl oz Brigadier 20 SC 12 fl oz 27bcd 25bcde 40bcd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 25.5 fl oz NA NA 19d 23cde 29d Capture LFR 25.5 fl oz NA NA 25cd 29bcde 37bcd +Admire Pro 4.6 SC 3.48 fl oz Capture LFR 12 fl oz Capture LFR 12 fl oz 23cd 34abcd 62a +Admire Pro 4.6 SC 3.48 fl oz Capture LFR 25.5 fl oz NA NA 19d 27bcde 43bcd +Belay 12 fl oz Mocap 6 EC 60 fl oz NA NA 13d 33abcd 38bcd Thimet 20-G 156 oz NA NA 26cd 38abc 49abc Platinum 75 SG 2.67 oz NA NA 44a 35abcd 53ab Admire Pro 4.6 SC 8.7 fl oz NA NA 37abc 39ab 49abc Regent 4 SC 3.2 fl oz NA NA 11d 17e 29d P value 0.0056 ns 0.0008 *plant date 25 Mar 2011 ±drag off date 26 Apr 2011 Means were separated using Fisher’s LSD with a 0.05 level of significance. Means followed by the same letter are not significantly different. Table 2 Mean # Wireworm Holes per Tuber At Plant Insecticide* Rate At Drag Off First Second Third Treatment/Formulation (acre) Insecticide± Rate Harvest Harvest Harvest Treatment/Formulation (acre) 6/16 6/23 6/29 Untreated Check NA NA NA 0.76a 0.73 1.65a Brigadier 20 SC 16 fl oz Brigadier 20 SC 6.4 fl oz 0.42abcd 0.77 0.77bcd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 16 fl oz NA NA 0.47abcd 0.39 0.61cd +Admire Pro 4.6 SC 5.2 fl oz Brigadier 20 SC 12 fl oz Brigadier 20 SC 12 fl oz 0.47abcd 0.46 0.77bcd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 12 fl oz Brigadier 20 SC 12 fl oz 0.32cd 0.42 0.83bcd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 25.5 fl oz NA NA 0.39bcd 0.40 0.51d Capture LFR 25.5 fl oz NA NA 0.37bcd 0.52 0.70bcd +Admire Pro 4.6 SC 3.48 fl oz Capture LFR 12 fl oz Capture LFR 12 fl oz 0.38bcd 0.66 1.62a +Admire Pro 4.6 SC 3.48 fl oz Capture LFR 25.5 fl oz NA NA 0.23cd 0.40 1.14abc +Belay 12 fl oz Mocap 6 EC 60 fl oz NA NA 0.16d 0.57 0.77bcd Thimet 20-G 156 oz NA NA 0.38bcd 0.69 1.05bcd Platinum 75 SG 2.67 oz NA NA 0.76a 0.63 1.10abc Admire Pro 4.6 SC 8.7 fl oz NA NA 0.57abc 0.82 1.18ab Regent 4 SC 3.2 fl oz NA NA 0.14d 0.24 0.51d P value 0.0431 ns 0.0012 *plant date 25 Mar 2011 ±drag off date 26 Apr 2011 Means were separated using Fisher’s LSD with a 0.05 level of significance. Means followed by the same letter are not significantly different. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

EVALUATION OF SOIL APPLIED INSECTICIDES FOR CONTROL OF WIREWORM IN POTATOES, 2011 B

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Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E53 (E53) POTATO: Solanum tuberosum L., ‘Atlantic’ Kevin W. Langdon Department of Entomology North Carolina State University Campus Box 7630 Raleigh, NC 27695 Phone: 919-515-1657 Fax: 919-515-3748 E-mail: kevin_langdon@ncsu.edu Mark R. Abney E-mail: mark_abney@ncsu.edu Corn wireworm (CW): Melanotus communis (Gyllenhall) The purpose of this experiment was to evaluate the efficacy of soil applied insecticides for control of CW in potato at the Tidewater Research Station in Plymouth, NC. The trial was arranged in a RCB with 14 treatments and four replicates. Plots were 1 row by 30 ft long planted on 76 inch centers with unplanted guard rows. Seed pieces were planted by hand on 25 Mar 2011 with 9 inch within row spacing and plants were managed according to local standard practices. In-furrow soil insecticides were applied immediately after seed pieces were placed in the furrow and before furrows were closed on 25 Mar. ‘Drag-off’ soil insecticide applications were made on 21 Apr; insecticide was applied to the soil surface directly over the row and incorporated with hilling discs. Thimet was applied as a granular formulation using a handheld granule shaker. All other insecticide applications were applied using a CO powered backpack sprayer with a single nozzle boom equipped with a DC25 core and a D4 disc delivering 15 gpa at 40 psi. Ten linear row ft of each plot was harvested by hand one time weekly for three weeks: 16 Jun, 23 Jun, and 29 Jun. At each harvest, tubers (n=50) were randomly collected from each plot and transported to the lab at NC State in Raleigh, NC. Tubers were washed and evaluated individually for wireworm damage incidence and severity. Treatment means were analyzed using the PROC MIXED in SAS (Version 9.2). Fisher’s LSD was used to separate significantly different means. Percent tuber damage data were arcsine square root transformed prior to analysis; untransformed means are presented here. Moderately dry soil moisture conditions persisted throughout the trial period. Wireworm pressure was high. General levels of percent wireworm damaged tubers and mean number of wireworm holes per tuber increased between harvests. Significant differences between treatments in percent of wireworm damaged tubers (Table 1) and mean number of wireworm holes per tuber (Table 2) were observed on the first harvest and third harvest. This research was supported by industry gifts of pesticide and funding. 1 Arthropod Management Tests 2012, Vol. 37 doi: 10.4182/amt.2012.E53 Table 1 % Wireworm Damaged Tubers At Plant Insecticide* At Drag Off First Second Third Treatment/Formulation Rate Insecticide± Rate Harvest Harvest Harvest (acre) Treatment/Formulation (acre) 6/16 6/23 6/29 Untreated Check NA NA NA 43.2ab 45a 64a Brigadier 20 SC 16 fl oz Brigadier 20 SC 6.4 fl oz 26cd 31abcde 35cd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 16 fl oz NA NA 24cd 22de 35cd +Admire Pro 4.6 SC 5.2 fl oz Brigadier 20 SC 12 fl oz Brigadier 20 SC 12 fl oz 22.8cd 25bcde 44bcd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 12 fl oz Brigadier 20 SC 12 fl oz 27bcd 25bcde 40bcd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 25.5 fl oz NA NA 19d 23cde 29d Capture LFR 25.5 fl oz NA NA 25cd 29bcde 37bcd +Admire Pro 4.6 SC 3.48 fl oz Capture LFR 12 fl oz Capture LFR 12 fl oz 23cd 34abcd 62a +Admire Pro 4.6 SC 3.48 fl oz Capture LFR 25.5 fl oz NA NA 19d 27bcde 43bcd +Belay 12 fl oz Mocap 6 EC 60 fl oz NA NA 13d 33abcd 38bcd Thimet 20-G 156 oz NA NA 26cd 38abc 49abc Platinum 75 SG 2.67 oz NA NA 44a 35abcd 53ab Admire Pro 4.6 SC 8.7 fl oz NA NA 37abc 39ab 49abc Regent 4 SC 3.2 fl oz NA NA 11d 17e 29d P value 0.0056 ns 0.0008 *plant date 25 Mar 2011 ±drag off date 26 Apr 2011 Means were separated using Fisher’s LSD with a 0.05 level of significance. Means followed by the same letter are not significantly different. Table 2 Mean # Wireworm Holes per Tuber At Plant Insecticide* Rate At Drag Off First Second Third Treatment/Formulation (acre) Insecticide± Rate Harvest Harvest Harvest Treatment/Formulation (acre) 6/16 6/23 6/29 Untreated Check NA NA NA 0.76a 0.73 1.65a Brigadier 20 SC 16 fl oz Brigadier 20 SC 6.4 fl oz 0.42abcd 0.77 0.77bcd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 16 fl oz NA NA 0.47abcd 0.39 0.61cd +Admire Pro 4.6 SC 5.2 fl oz Brigadier 20 SC 12 fl oz Brigadier 20 SC 12 fl oz 0.47abcd 0.46 0.77bcd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 12 fl oz Brigadier 20 SC 12 fl oz 0.32cd 0.42 0.83bcd +Admire Pro 4.6 SC 3.48 fl oz Brigadier 20 SC 25.5 fl oz NA NA 0.39bcd 0.40 0.51d Capture LFR 25.5 fl oz NA NA 0.37bcd 0.52 0.70bcd +Admire Pro 4.6 SC 3.48 fl oz Capture LFR 12 fl oz Capture LFR 12 fl oz 0.38bcd 0.66 1.62a +Admire Pro 4.6 SC 3.48 fl oz Capture LFR 25.5 fl oz NA NA 0.23cd 0.40 1.14abc +Belay 12 fl oz Mocap 6 EC 60 fl oz NA NA 0.16d 0.57 0.77bcd Thimet 20-G 156 oz NA NA 0.38bcd 0.69 1.05bcd Platinum 75 SG 2.67 oz NA NA 0.76a 0.63 1.10abc Admire Pro 4.6 SC 8.7 fl oz NA NA 0.57abc 0.82 1.18ab Regent 4 SC 3.2 fl oz NA NA 0.14d 0.24 0.51d P value 0.0431 ns 0.0012 *plant date 25 Mar 2011 ±drag off date 26 Apr 2011 Means were separated using Fisher’s LSD with a 0.05 level of significance. Means followed by the same letter are not significantly different.

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Arthropod Management TestsOxford University Press

Published: Jan 1, 2012

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