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Efficacy of Fluxametamide for Control of Two Sweetpotato Weevil Species, 2019

Efficacy of Fluxametamide for Control of Two Sweetpotato Weevil Species, 2019 applyparastyle "fig//caption/p[1]" parastyle "FigCapt" applyparastyle "fig" parastyle "Figure" Arthropod Management T ests, 46(1), 2021, 1–2 doi: 10.1093/amt/tsab064 Section E: Vegetable Crops SWEETPOTATO: Ipomoea batatas (L.) Lamarck, HeadA=HeadB=HeadA=HeadB/HeadA ‘Churakoibeni’ HeadB=HeadC=HeadB=HeadC/HeadB HeadC=HeadD=HeadC=HeadD/HeadC Efficacy of Fluxametamide for Control of Two Extract3=HeadA=Extract1=HeadA History=Text=History=Text_First Sweetpotato Weevil Species, 2019 EDI_HeadA=EDI_HeadB=EDI_HeadA=EDI_HeadB/HeadA Katsuya Ichinose EDI_HeadB=EDI_HeadC=EDI_HeadB=EDI_HeadC/HeadB EDI_HeadC=EDI_HeadD=EDI_HeadC=EDI_HeadD/HeadC Tropical Pest Management, Kyushu Agricultural Research Center, Makabe 820, Itoman, Okinawa 901-0336, Japan, Phone: +81-988403553, Fax: +81-988403578 and Corresponding author, e-mail: ichis@affrc.go.jp EDI_Extract3=EDI_HeadA=EDI_Extract1=EDI_HeadA ERR_HeadA=ERR_HeadB=ERR_HeadA=ERR_HeadB/HeadA Section Editor: Mark R. Abney ERR_HeadB=ERR_HeadC=ERR_HeadB=ERR_HeadC/HeadB Potato (sweet) | Ipomoea batatas ERR_HeadC=ERR_HeadD=ERR_HeadC=ERR_HeadD/HeadC Sweetpotato weevils (SWC) | Cylas formicarius F. ERR_Extract3=ERR_HeadA=ERR_Extract1=ERR_HeadA West Indian sweetpotato weevil (SWE) | Euscepes postfasciatus (Fairmaire) This study was performed to evaluate the efficacy of three relatively sweetpotato within 1 wk were released two times in each plot, equiv- new insecticides, fluxametamide, flubendiamide, and dinotefuran, alent to four per plant, in this experiment: 30 Jul and 9 Sept 2019. As for the control of serious sweetpotato weevil pests, SWC and SWE, SWC can fly over several kilometers in one flight, on the other hand, in an experimental farm of the Okinawa Prefectural Agricultural they were left to invade the experimental field naturally. Four plants Research Center in Itoman on the Okinawa Island, southern Japan, were randomly selected in each plot and their whole root system in 2019. A block, 29.7 m long and 19.2 m wide, was set there and was collected on 16 Nov 2019. Tubers ≥ 50 g and the rest of the root 24 ridges were made along the longer side at an interval of 0.8 system in each plant were weighted at a precision to 0.1 g individ- m.  Slips of sweetpotato cultivar ‘Churakoibeni’ were planted at a ually, and then they were dissected to collect and count all infesting 0.3 m spacing on each ridge on 14 Jun 2019, and 36 plots of the weevils in all developmental stages except for egg for each species. same size, 4.8 by 3.3 m, were distributed in the block. Each plot was Holes made on the root surface when adults had emerged were consisted of six ridges, on each of which 60 plants were present. Six counted before the dissection, although the species could not have treatments were randomly assigned to the 36 plots, six replicates been identified. This could have made the total number of weevils in in each treatment: untreated check as control and the application a given plant larger than the sum of SWC and SWE. of chlorpyrifos (Nissan Chemical, Tokyo, Japan), cyantraniliprole The efficacy of insecticide treatments was assessed by ANOVA (FMC Chemicals, Tokyo, Japan), flubendiamide (Nihon Nohyaku, and Tukey’s HSD tests (P = 0.05) applied on the number of weevils Tokyo, Japan), fluxametamide (Nissan Chemical, Tokyo, Japan), or infesting the root and the proportion of the weight of weevil- dinotefuran (Mitsui Chemicals Agro, Tokyo, Japan). The efficacy of injured roots to that of the entire root system of the plant. In these the latter three insecticides on the weevils was evaluated in com- analyses, the weevil number, root weight, and injury proportion were parison with the former three treatments, in particular focusing on transformed in square-root, natural logarithmic, and the root-square their effects on the weevils. Insecticide compounds, formulations, arcsine, respectively. All means in this report were calculated on non- and treatments are provided in Table 1. All insecticides except for transformed data (Table 2). dinotefuran are officially registered to use two to three times in one Weights of root yield per plant were not significantly different sweetpotato cultivation after planting. They were applied twice in among treatments, although there were more than two times dif- this experiment: on 11 Aug and 5 Oct 2019. Dinotefuran can be of- ference in the means, smallest in chlorpyrifos and largest in ficially used only once in one sweetpotato cultivation after planting fluxametamide (Table 2). The occurrences of and tuber damage by and was applied on Oct 5 in this experiment. In these applications, both SWC and SWE were all significantly different among treatments. chlorpyrifos in granular formulation was manually sown around SWC detected significantly fewer in chlorpyrifos, cyantraniliprole, the main stem of each plant on the ground and the other insecticides and fluxametamide treatments than in the other treatments, among in liquid formulation diluted by water were sprayed by sprayers. which no significant differences were detected. SWE were fewest in Since SWE naturally occurs little in sweetpotato farms in cyantraniliprole, followed by chlorpyrifos and fluxametamide. There Okinawa due to the lack of their flying ability, 240 adults which were no significant differences between the latter two. Although had been reared on sweetpotatos in laboratory and appeared from these two treatments were not significantly different in this weevil © The Author(s) 2021. Published by Oxford University Press on behalf of Entomological Society of America. 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/ licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com 2 Arthropod Management T ests, 2021, Vol. 46, No. 1 occurrence from untreated check, flubendiamide and dinotefran, they significantly less than those in all the other treatments. Therefore, were also not significantly different from cyantraniliprole. The sum fluxametamide was as effective on the control of both weevil species, of all weevils found in the root was not significantly different among SWC and SWE, as chlorpyrifos and cyantraniliprole. In contrast, chlorpyrifos, cyantraniliprole, and fluxametamide, and these three flubendiamide and dinotefuran were much less efficacious than these were significantly different from the rest three treatments. Tubers two insecticides and accordingly are not practical for the control of in fluxametamide were damaged by SWC, SWE, and both weevils these two weevil species. Table 1. Treatment Insecticides Formulation Content (%) Dilution in water Quantity/plot Application frequency/ mode Untreated Check --- --- --- --- --- a b Chlorpyrifos Granule 3.0 --- 95.0 g 2/around stem Cyantraniliprole Liquid 10.3 4,000 4.75 liters 2/sprayed Flubendiamide Granule 20.0 4,000 9.50 liters 2/sprayed Fluxametamide Liquid 10.0 3,000 7.13 liters 2/sprayed Dinotefuran Granule 20.0 2,000 4.75 liters 1/sprayed Chlorpyrifos in granular formulation was applied, not dissolved in water. Chlorpyrifos is registered to apply in 60 kg per hectare. The size of plot in this study was 4.8 by 3.3 m, and 95.04 g equivalent to the officially registered dose was applied around the stem of 60 plants in the plot for this insecticide treatment. Table 2. a b c Treatment/formulation Yield Weevils/plant Injury proportion (%) g/plant SWC SWE All SWC SWE All Untreated Check 152.4 4.3a 7.0a 14.2a 32.8a 67.4a 88.8a Chlorpyrifos 80.6 0.3b 1.5ab 2.7b 10.6ab 34.5ab 51.2ab Cyantraniliprole 142.8 0.4b 0.2b 2.7b 19.9ab 9.1b 41.3b Flubendiamide 158.3 5.5a 3.0ab 11.8a 47.4a 35.0ab 70.5ab Fluxametamide 189.5 0.0b 2.3ab 3.3b 0.0b 18.2b 29.3b Dinotefuran 118.1 0.8ab 6.9a 10.8a 18.8ab 60.8a 84.3a P>F 0.195 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 Means within columns followed by the same letter are not significantly different; P > 0.05, Tukey’s HSD test. Natural logarithmically (X) transformed data used for analysis, non-transformed means shown in the table. Square-root transformed data used for analysis, non-transformed means shown in the table. Root-square arcsine transformed data used for analysis, non-transformed means shown in the table. This study was supported by Kyushu Agricultural Research Center. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Efficacy of Fluxametamide for Control of Two Sweetpotato Weevil Species, 2019

Arthropod Management Tests , Volume 46 (1): 1 – Apr 3, 2021

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Oxford University Press
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© The Author(s) 2021. Published by Oxford University Press on behalf of Entomological Society of America.
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2155-9856
DOI
10.1093/amt/tsab064
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Abstract

applyparastyle "fig//caption/p[1]" parastyle "FigCapt" applyparastyle "fig" parastyle "Figure" Arthropod Management T ests, 46(1), 2021, 1–2 doi: 10.1093/amt/tsab064 Section E: Vegetable Crops SWEETPOTATO: Ipomoea batatas (L.) Lamarck, HeadA=HeadB=HeadA=HeadB/HeadA ‘Churakoibeni’ HeadB=HeadC=HeadB=HeadC/HeadB HeadC=HeadD=HeadC=HeadD/HeadC Efficacy of Fluxametamide for Control of Two Extract3=HeadA=Extract1=HeadA History=Text=History=Text_First Sweetpotato Weevil Species, 2019 EDI_HeadA=EDI_HeadB=EDI_HeadA=EDI_HeadB/HeadA Katsuya Ichinose EDI_HeadB=EDI_HeadC=EDI_HeadB=EDI_HeadC/HeadB EDI_HeadC=EDI_HeadD=EDI_HeadC=EDI_HeadD/HeadC Tropical Pest Management, Kyushu Agricultural Research Center, Makabe 820, Itoman, Okinawa 901-0336, Japan, Phone: +81-988403553, Fax: +81-988403578 and Corresponding author, e-mail: ichis@affrc.go.jp EDI_Extract3=EDI_HeadA=EDI_Extract1=EDI_HeadA ERR_HeadA=ERR_HeadB=ERR_HeadA=ERR_HeadB/HeadA Section Editor: Mark R. Abney ERR_HeadB=ERR_HeadC=ERR_HeadB=ERR_HeadC/HeadB Potato (sweet) | Ipomoea batatas ERR_HeadC=ERR_HeadD=ERR_HeadC=ERR_HeadD/HeadC Sweetpotato weevils (SWC) | Cylas formicarius F. ERR_Extract3=ERR_HeadA=ERR_Extract1=ERR_HeadA West Indian sweetpotato weevil (SWE) | Euscepes postfasciatus (Fairmaire) This study was performed to evaluate the efficacy of three relatively sweetpotato within 1 wk were released two times in each plot, equiv- new insecticides, fluxametamide, flubendiamide, and dinotefuran, alent to four per plant, in this experiment: 30 Jul and 9 Sept 2019. As for the control of serious sweetpotato weevil pests, SWC and SWE, SWC can fly over several kilometers in one flight, on the other hand, in an experimental farm of the Okinawa Prefectural Agricultural they were left to invade the experimental field naturally. Four plants Research Center in Itoman on the Okinawa Island, southern Japan, were randomly selected in each plot and their whole root system in 2019. A block, 29.7 m long and 19.2 m wide, was set there and was collected on 16 Nov 2019. Tubers ≥ 50 g and the rest of the root 24 ridges were made along the longer side at an interval of 0.8 system in each plant were weighted at a precision to 0.1 g individ- m.  Slips of sweetpotato cultivar ‘Churakoibeni’ were planted at a ually, and then they were dissected to collect and count all infesting 0.3 m spacing on each ridge on 14 Jun 2019, and 36 plots of the weevils in all developmental stages except for egg for each species. same size, 4.8 by 3.3 m, were distributed in the block. Each plot was Holes made on the root surface when adults had emerged were consisted of six ridges, on each of which 60 plants were present. Six counted before the dissection, although the species could not have treatments were randomly assigned to the 36 plots, six replicates been identified. This could have made the total number of weevils in in each treatment: untreated check as control and the application a given plant larger than the sum of SWC and SWE. of chlorpyrifos (Nissan Chemical, Tokyo, Japan), cyantraniliprole The efficacy of insecticide treatments was assessed by ANOVA (FMC Chemicals, Tokyo, Japan), flubendiamide (Nihon Nohyaku, and Tukey’s HSD tests (P = 0.05) applied on the number of weevils Tokyo, Japan), fluxametamide (Nissan Chemical, Tokyo, Japan), or infesting the root and the proportion of the weight of weevil- dinotefuran (Mitsui Chemicals Agro, Tokyo, Japan). The efficacy of injured roots to that of the entire root system of the plant. In these the latter three insecticides on the weevils was evaluated in com- analyses, the weevil number, root weight, and injury proportion were parison with the former three treatments, in particular focusing on transformed in square-root, natural logarithmic, and the root-square their effects on the weevils. Insecticide compounds, formulations, arcsine, respectively. All means in this report were calculated on non- and treatments are provided in Table 1. All insecticides except for transformed data (Table 2). dinotefuran are officially registered to use two to three times in one Weights of root yield per plant were not significantly different sweetpotato cultivation after planting. They were applied twice in among treatments, although there were more than two times dif- this experiment: on 11 Aug and 5 Oct 2019. Dinotefuran can be of- ference in the means, smallest in chlorpyrifos and largest in ficially used only once in one sweetpotato cultivation after planting fluxametamide (Table 2). The occurrences of and tuber damage by and was applied on Oct 5 in this experiment. In these applications, both SWC and SWE were all significantly different among treatments. chlorpyrifos in granular formulation was manually sown around SWC detected significantly fewer in chlorpyrifos, cyantraniliprole, the main stem of each plant on the ground and the other insecticides and fluxametamide treatments than in the other treatments, among in liquid formulation diluted by water were sprayed by sprayers. which no significant differences were detected. SWE were fewest in Since SWE naturally occurs little in sweetpotato farms in cyantraniliprole, followed by chlorpyrifos and fluxametamide. There Okinawa due to the lack of their flying ability, 240 adults which were no significant differences between the latter two. Although had been reared on sweetpotatos in laboratory and appeared from these two treatments were not significantly different in this weevil © The Author(s) 2021. Published by Oxford University Press on behalf of Entomological Society of America. 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (http://creativecommons.org/ licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com 2 Arthropod Management T ests, 2021, Vol. 46, No. 1 occurrence from untreated check, flubendiamide and dinotefran, they significantly less than those in all the other treatments. Therefore, were also not significantly different from cyantraniliprole. The sum fluxametamide was as effective on the control of both weevil species, of all weevils found in the root was not significantly different among SWC and SWE, as chlorpyrifos and cyantraniliprole. In contrast, chlorpyrifos, cyantraniliprole, and fluxametamide, and these three flubendiamide and dinotefuran were much less efficacious than these were significantly different from the rest three treatments. Tubers two insecticides and accordingly are not practical for the control of in fluxametamide were damaged by SWC, SWE, and both weevils these two weevil species. Table 1. Treatment Insecticides Formulation Content (%) Dilution in water Quantity/plot Application frequency/ mode Untreated Check --- --- --- --- --- a b Chlorpyrifos Granule 3.0 --- 95.0 g 2/around stem Cyantraniliprole Liquid 10.3 4,000 4.75 liters 2/sprayed Flubendiamide Granule 20.0 4,000 9.50 liters 2/sprayed Fluxametamide Liquid 10.0 3,000 7.13 liters 2/sprayed Dinotefuran Granule 20.0 2,000 4.75 liters 1/sprayed Chlorpyrifos in granular formulation was applied, not dissolved in water. Chlorpyrifos is registered to apply in 60 kg per hectare. The size of plot in this study was 4.8 by 3.3 m, and 95.04 g equivalent to the officially registered dose was applied around the stem of 60 plants in the plot for this insecticide treatment. Table 2. a b c Treatment/formulation Yield Weevils/plant Injury proportion (%) g/plant SWC SWE All SWC SWE All Untreated Check 152.4 4.3a 7.0a 14.2a 32.8a 67.4a 88.8a Chlorpyrifos 80.6 0.3b 1.5ab 2.7b 10.6ab 34.5ab 51.2ab Cyantraniliprole 142.8 0.4b 0.2b 2.7b 19.9ab 9.1b 41.3b Flubendiamide 158.3 5.5a 3.0ab 11.8a 47.4a 35.0ab 70.5ab Fluxametamide 189.5 0.0b 2.3ab 3.3b 0.0b 18.2b 29.3b Dinotefuran 118.1 0.8ab 6.9a 10.8a 18.8ab 60.8a 84.3a P>F 0.195 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 Means within columns followed by the same letter are not significantly different; P > 0.05, Tukey’s HSD test. Natural logarithmically (X) transformed data used for analysis, non-transformed means shown in the table. Square-root transformed data used for analysis, non-transformed means shown in the table. Root-square arcsine transformed data used for analysis, non-transformed means shown in the table. This study was supported by Kyushu Agricultural Research Center.

Journal

Arthropod Management TestsOxford University Press

Published: Apr 3, 2021

Keywords: Potato (sweet) | Ipomoea batatas; Sweetpotato weevils (SWC) | Cylas formicarius F; West Indian sweetpotato weevil (SWE) | Euscepes postfasciatus (Fairmaire); chlorpyrifos; cyantraniliprole; dinotefuran; flubendiamide; fluxametamide

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