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Foliar Applications of an Experimental Biopesticide for Control of Sweetpotato Whitefly on Zucchini Squash, 2020

Foliar Applications of an Experimental Biopesticide for Control of Sweetpotato Whitefly on... applyparastyle "fig//caption/p[1]" parastyle "FigCapt" applyparastyle "fig" parastyle "Figure" Arthropod Management T ests, 46(1), 2021, 1–2 doi: 10.1093/amt/tsab065 Section E: Vegetable Crops ZUCCHINI SQUASH: Cucurbita pepo L., ‘Paycheck’ HeadA=HeadB=HeadA=HeadB/HeadA HeadB=HeadC=HeadB=HeadC/HeadB Foliar Applications of an Experimental Biopesticide for HeadC=HeadD=HeadC=HeadD/HeadC Extract3=HeadA=Extract1=HeadA Control of Sweetpotato Whitefly on Zucchini Squash, History=Text=History=Text_First EDI_HeadA=EDI_HeadB=EDI_HeadA=EDI_HeadB/HeadA 1, EDI_HeadB=EDI_HeadC=EDI_HeadB=EDI_HeadC/HeadB Jawwad Qureshi and Barry C. Kostyk EDI_HeadC=EDI_HeadD=EDI_HeadC=EDI_HeadD/HeadC University of Florida/ IFAS Southwest Florida Res. and Ed. Center, 2685 State Road 29 North, Immokalee, FL 34142-9515 and EDI_Extract3=EDI_HeadA=EDI_Extract1=EDI_HeadA 1 Corresponding author, e-mail: jawwadq@ufl.edu ERR_HeadA=ERR_HeadB=ERR_HeadA=ERR_HeadB/HeadA Section Editor: Mark Abney ERR_HeadB=ERR_HeadC=ERR_HeadB=ERR_HeadC/HeadB Yellow squash fruit | Cucurbita pepo ERR_HeadC=ERR_HeadD=ERR_HeadC=ERR_HeadD/HeadC Sweetpotato whitefly (SWF) | Bemisia tabaci (Gennadius) ERR_Extract3=ERR_HeadA=ERR_Extract1=ERR_HeadA Bemisia tabaci can be a serious pest of squash, causing loss of yield under a stereoscopic microscope. Data were subjected to one-way and fruit quality by feeding on the plant sap and transmitting viruses. ANOVA and means separated using LSD (P = 0.05). For this trial, two raised beds 32 inches wide on 6-ft centers, 360 ft On 9 and 23 Oct, all treatments resulted in statistically signifi- long, and covered with white on black polyethylene film were pre- cantly lower adult whitefly when compared to the untreated check pared on 19 Aug at the Southwest Florida Research and Education with no differences amongst the treatments (Table 1). However, Center in Immokalee FL. Plants were directly seeded via hand on 16 Oct, the lowest rate of the MBI 203 SE did not lower the planting at 24-inch spacing on 9 Sep. Plots were assigned in an RCB number of adults observed compared to the untreated check or the design with four replications and five treatments plus an untreated other rates of that product (Table 1). On 30 Oct, only Courier and check with 10 plants in each single row plot and two plants between Grandevo WDG resulted in significantly fewer adults than the un- each plot acting as a spray buffer and pest reservoir. treated check, and by 6 Nov no treatment effects were observed. Foliar treatments were applied 6, 13, 20, 27 Oct, and 3 Nov with The first pass of Tropical Storm Eta occurred prior to population - a high clearance sprayer operating at 180 psi and 2.3 mph with de- collapse observed. livery through two vertical booms, each equipped with yellow Albuz An interesting dose-response was observed with the MBI 306 hollow cone nozzles that were adjusted according to plant growth. SE1 on whitefly nymphs. Only the high rate resulted in signifi- The 6 Oct application was conducted at 40 gpa (four nozzles), while cantly lower numbers when compared to the untreated check on the remaining sprays were conducted at 60 gpa (six nozzles). 9 Oct, while on 16 Oct, the 2.5 and 5 fl oz rate had significantly Adult whiteflies were counted weekly from 9 Oct to 6 Nov by lower numbers than the untreated check. All three rates resulted carefully turning over three leaves on each of five plants per plot. in a significantly lower number of whitefly nymphs on 23 and 30 Whitefly nymphs were sampled on the same dates by collecting Oct. On 6 Nov, after Tropical Storm Eta, no differences between one lower leaf from each of five plants per plot, removing twelve any of the treatments, including the untreated check were seen 2 1 0.5  inch discs from each leaf, and counting pre-imaginal stages (Table 2). No Phytotoxicity was observed. This research was supported by industry gifts of pesticide and funds. © 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 Table 1. Treatment/formulation Rate/acre No. adult whitefly per leaf 9-Oct 16-Oct 23-Oct 30-Oct 6-Nov Untreated check 3.85a 3.13a 7.60a 15.08a 2.27a Courier SC 13.6 fl oz 2.41b 2.25bc 4.63b 10.08c 1.88a Grandevo WDG 2 lbs 2.01b 1.47c 4.98b 11.20bc 2.10a MBI 306 SE1 1.25 fl oz 2.53b 2.73ab 4.68b 13.17ab 2.38a MBI 306 SE1 2.5 fl oz 2.27b 2.03bc 4.17b 12.75abc 2.70a MBI 306 SE1 5 fl oz 2.47b 1.90bc 5.27b 13.75ab 2.58a Means within columns followed by same letter are not statistically different (LSD, P > 0.05). Table 2. Treatment/formulation rate/acre No. whitefly nymphs per 6 square inches 9-Oct 16-Oct 23-Oct 30-Oct 6-Nov Untreated check 22.35a 37.90a 43.05a 23.95a 15.40a Courier SC 13.6 fl oz 12.1 b 19.35b 17.45b 7.95b 6.50a Grandevo WDG 2 lbs 8.10b 18.10b 25.15b 12.15b 9.85a MBI 306 SE1 1.25 fl oz 15.95ab 32.90a 22.60b 12.80b 12.85a MBI 306 SE1 2.5 fl oz 14.15ab 21.80b 20.45b 11.8 b 8.60a MBI 306 SE1 5 fl oz 10.45b 20.05b 19.25b 10.35b 11.95a Means within columns followed by same letter are not statistically different (LSD, P > 0.05). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Foliar Applications of an Experimental Biopesticide for Control of Sweetpotato Whitefly on Zucchini Squash, 2020

Qureshi, Jawwad; Kostyk, Barry C
Arthropod Management Tests , Volume 46 (1): 1 – Apr 7, 2021
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Publisher
Oxford University Press
Copyright
© The Author(s) 2021. Published by Oxford University Press on behalf of Entomological Society of America.
eISSN
2155-9856
DOI
10.1093/amt/tsab065
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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/tsab065 Section E: Vegetable Crops ZUCCHINI SQUASH: Cucurbita pepo L., ‘Paycheck’ HeadA=HeadB=HeadA=HeadB/HeadA HeadB=HeadC=HeadB=HeadC/HeadB Foliar Applications of an Experimental Biopesticide for HeadC=HeadD=HeadC=HeadD/HeadC Extract3=HeadA=Extract1=HeadA Control of Sweetpotato Whitefly on Zucchini Squash, History=Text=History=Text_First EDI_HeadA=EDI_HeadB=EDI_HeadA=EDI_HeadB/HeadA 1, EDI_HeadB=EDI_HeadC=EDI_HeadB=EDI_HeadC/HeadB Jawwad Qureshi and Barry C. Kostyk EDI_HeadC=EDI_HeadD=EDI_HeadC=EDI_HeadD/HeadC University of Florida/ IFAS Southwest Florida Res. and Ed. Center, 2685 State Road 29 North, Immokalee, FL 34142-9515 and EDI_Extract3=EDI_HeadA=EDI_Extract1=EDI_HeadA 1 Corresponding author, e-mail: jawwadq@ufl.edu ERR_HeadA=ERR_HeadB=ERR_HeadA=ERR_HeadB/HeadA Section Editor: Mark Abney ERR_HeadB=ERR_HeadC=ERR_HeadB=ERR_HeadC/HeadB Yellow squash fruit | Cucurbita pepo ERR_HeadC=ERR_HeadD=ERR_HeadC=ERR_HeadD/HeadC Sweetpotato whitefly (SWF) | Bemisia tabaci (Gennadius) ERR_Extract3=ERR_HeadA=ERR_Extract1=ERR_HeadA Bemisia tabaci can be a serious pest of squash, causing loss of yield under a stereoscopic microscope. Data were subjected to one-way and fruit quality by feeding on the plant sap and transmitting viruses. ANOVA and means separated using LSD (P = 0.05). For this trial, two raised beds 32 inches wide on 6-ft centers, 360 ft On 9 and 23 Oct, all treatments resulted in statistically signifi- long, and covered with white on black polyethylene film were pre- cantly lower adult whitefly when compared to the untreated check pared on 19 Aug at the Southwest Florida Research and Education with no differences amongst the treatments (Table 1). However, Center in Immokalee FL. Plants were directly seeded via hand on 16 Oct, the lowest rate of the MBI 203 SE did not lower the planting at 24-inch spacing on 9 Sep. Plots were assigned in an RCB number of adults observed compared to the untreated check or the design with four replications and five treatments plus an untreated other rates of that product (Table 1). On 30 Oct, only Courier and check with 10 plants in each single row plot and two plants between Grandevo WDG resulted in significantly fewer adults than the un- each plot acting as a spray buffer and pest reservoir. treated check, and by 6 Nov no treatment effects were observed. Foliar treatments were applied 6, 13, 20, 27 Oct, and 3 Nov with The first pass of Tropical Storm Eta occurred prior to population - a high clearance sprayer operating at 180 psi and 2.3 mph with de- collapse observed. livery through two vertical booms, each equipped with yellow Albuz An interesting dose-response was observed with the MBI 306 hollow cone nozzles that were adjusted according to plant growth. SE1 on whitefly nymphs. Only the high rate resulted in signifi- The 6 Oct application was conducted at 40 gpa (four nozzles), while cantly lower numbers when compared to the untreated check on the remaining sprays were conducted at 60 gpa (six nozzles). 9 Oct, while on 16 Oct, the 2.5 and 5 fl oz rate had significantly Adult whiteflies were counted weekly from 9 Oct to 6 Nov by lower numbers than the untreated check. All three rates resulted carefully turning over three leaves on each of five plants per plot. in a significantly lower number of whitefly nymphs on 23 and 30 Whitefly nymphs were sampled on the same dates by collecting Oct. On 6 Nov, after Tropical Storm Eta, no differences between one lower leaf from each of five plants per plot, removing twelve any of the treatments, including the untreated check were seen 2 1 0.5  inch discs from each leaf, and counting pre-imaginal stages (Table 2). No Phytotoxicity was observed. This research was supported by industry gifts of pesticide and funds. © 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 Table 1. Treatment/formulation Rate/acre No. adult whitefly per leaf 9-Oct 16-Oct 23-Oct 30-Oct 6-Nov Untreated check 3.85a 3.13a 7.60a 15.08a 2.27a Courier SC 13.6 fl oz 2.41b 2.25bc 4.63b 10.08c 1.88a Grandevo WDG 2 lbs 2.01b 1.47c 4.98b 11.20bc 2.10a MBI 306 SE1 1.25 fl oz 2.53b 2.73ab 4.68b 13.17ab 2.38a MBI 306 SE1 2.5 fl oz 2.27b 2.03bc 4.17b 12.75abc 2.70a MBI 306 SE1 5 fl oz 2.47b 1.90bc 5.27b 13.75ab 2.58a Means within columns followed by same letter are not statistically different (LSD, P > 0.05). Table 2. Treatment/formulation rate/acre No. whitefly nymphs per 6 square inches 9-Oct 16-Oct 23-Oct 30-Oct 6-Nov Untreated check 22.35a 37.90a 43.05a 23.95a 15.40a Courier SC 13.6 fl oz 12.1 b 19.35b 17.45b 7.95b 6.50a Grandevo WDG 2 lbs 8.10b 18.10b 25.15b 12.15b 9.85a MBI 306 SE1 1.25 fl oz 15.95ab 32.90a 22.60b 12.80b 12.85a MBI 306 SE1 2.5 fl oz 14.15ab 21.80b 20.45b 11.8 b 8.60a MBI 306 SE1 5 fl oz 10.45b 20.05b 19.25b 10.35b 11.95a Means within columns followed by same letter are not statistically different (LSD, P > 0.05).

Journal

Arthropod Management Tests – Oxford University Press

Published: Apr 7, 2021

Keywords: Yellow squash fruit | Cucurbita pepo; Sweetpotato whitefly (SWF) | Bemisia tabaci (Gennadius); buprofezin; Chromobacterium subtsugae

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