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Control of Aphids on Mustard in a Commercial Field, 1996

Control of Aphids on Mustard in a Commercial Field, 1996 Downloaded from https://academic.oup.com/amt/article-abstract/22/1/137/4640155 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 22 137 LETTUCE: Lactuca sativa L., 'Winterset' J. C. Palumbo, C. H. Mullis, (61E) Green peach aphid; Myzus persicae (Sulzer) and F. J. Reyes Potato aphid; Macrosiphum euphorbiae (Thomas) University of Arizona * Department of Entomology Yuma Agricultural Center Yuma, Arizona 85364 (602) 782-3836 EVALUATION OF APHID CONTROL IN LETTUCE WITH ADMIRE APPLIED THROUGH DRIP IRRIGATION. Lettuce was direct seeded on 29 Nov at the Yuma Valley Agricultural Center, Yuma, AZ. into double row beds on 42 inch centers and stand establishment achieved using overhead sprinkler irrigation. Subsequent irrigations and chemigations were made with sub-surface (6-8") drip irrigation. Plots consisted of 4 beds, 50 feet long with a two bed buffer between the plots. Plots were arranged in a RCB design with four replications. The four Admire 2F chemigation treatments were applied once 54 d after planting (23 Jan) through the drip system during the last hour of the irrigation run. The two Metasystox-R chemigation treat­ ments were applied through the drip three times on 23 Jan, 1 and 8 Feb. The foliar Metasystox-R + Capture treatment was applied at 60 PSI in 20 gpa to­ tal volume on 23 Jan, 1 and 8 Feb. Insect data were collected only from the inner two beds of each plot. Aphid densities were estimated bi-weekly by sam­ pling 10 plants per replicate and counting the total number of aphids per plant. Data were analyzed as a 1-way ANOVA using a protected LSD F test to distinguish treatment mean differences. The two aphid species varied in relative abundance throughout the study. Admire applied at rates of 10 oz/acre or greater provided consistent con­ trol of aphids. Admire applied at 5 oz appeared to maintain low numbers near harvest, but 5% of the heads were found to be heavily infested (>10 aphids/head) at harvest. The Metasystox-R (32 oz) chemigation treatment provided control comparable to the Admire chemigation treatments. No phyto- toxicity was observed. Mean no. apterous aphids/plant Treatment 30 Dec 14 Jan 28 Jan 12 Feb 26 Feb 11 Mar Rate" Admire 2F 0.2a 4.1a 9.8b 4.3c 11.2cd 8.6d 20 oz Admire 2F 0.1a 4.2a 11.4b 4.9c 4.1d 10. le d 15 oz Admire 2F 10 oz 0.1a 5.3a 10.4b 12.1c 11.3bcd 9.6cd 8.6d Admire 2F 5 oz 0.0a 7.1a 18.3ab 10.3c 23.4abc Metasystox R 16 oz 0.0a 5.2a 19.8ab 58.4ab 38.4ab 50.2b Metasystox R 32 oz 0.1a 4.4a 32.0a 92.2a 11.8bcd ll.Obcd Metasystox R +Capture 2EC 32 oz + 5 oz 0.0a 6.2a 13.2b 16.3bc 19.8bc 25.8bc Untreated Check 1.0 0.1a 5.0a 34.5a 88.5a 70.4a 212.7a Means within columns followed by the same letter are not significantly different (P = 0.05), protected LSD. "Rate expressed as volume of formulated product/acre. MUSTARD: Brassica campestris L., 'Savanah' J. V. Edelson and M. Peters (62E) Turnip aphid; Lipaphis erysimi (Kaltenbach) Oklahoma State Univ./WWAREC Lane, OK 74555 405-889-7343 CONTROL OF APHIDS ON MUSTARD IN A COMMERCIAL FIELD, 1996: A commercial production field of mustard was used for this trial. Plants were grown in 6 row beds on 6 ft centers. The field was direct seeded in Apr approximately 1 mile west of Webbers Falls, OK. Small plots were delimited on one edge of the field. The experimental design was a RCB with 4 replicates and 7 treatments. Insecticide applications were made on 23 and 29 May using a bicycle tire mounted sprayer with 4 hollow cone nozzles (TXVS26) per bed applying 40 gpa solution at 42 psi. Plots were 1 bed wide and 20 ft long with 5 ft alleys between plots. Insect populations were surveyed by examining 5 plants per plot on 29 Ma y (prior to the second application of insecticides) and 3 Jun to determine treatment effects. Aphid population infestations were minimal throughout the study period. Aphistar and Provado provided best control of aphids, reducing their pop­ ulations significantly below the levels in the untreated as well as other treatment plots. Mean no. aphids/5 plants" Treatment Rate/acre 30 May 3 Jun Permethrin O.llb(AI) lie 22 a Dimethoate 0.25 lb (AI) 13 c 12ab Methomyl 0.9 lb (AI) 10 c 10 ab Untreated Check 16 c 5 be Endosulfan 0.75 lb (AI) 7 c 2 c Aphistar 0.12 lb (AI) 3 a <1 d Provado 1.6 3.75 oz 5 b <1 d Means in a column followed by differing letters are significantly different. Data analyzed using SAS after log 10 transformation; means separated using LSD at P = 0.1 ; untransformed mean values reported. "Aphids were primarily turnip aphids. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Control of Aphids on Mustard in a Commercial Field, 1996

Arthropod Management Tests , Volume 22 (1) – Jan 1, 1997

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Publisher
Oxford University Press
Copyright
© 1997 Entomological Society of America.
eISSN
2155-9856
DOI
10.1093/amt/22.1.137a
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Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/22/1/137/4640155 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 22 137 LETTUCE: Lactuca sativa L., 'Winterset' J. C. Palumbo, C. H. Mullis, (61E) Green peach aphid; Myzus persicae (Sulzer) and F. J. Reyes Potato aphid; Macrosiphum euphorbiae (Thomas) University of Arizona * Department of Entomology Yuma Agricultural Center Yuma, Arizona 85364 (602) 782-3836 EVALUATION OF APHID CONTROL IN LETTUCE WITH ADMIRE APPLIED THROUGH DRIP IRRIGATION. Lettuce was direct seeded on 29 Nov at the Yuma Valley Agricultural Center, Yuma, AZ. into double row beds on 42 inch centers and stand establishment achieved using overhead sprinkler irrigation. Subsequent irrigations and chemigations were made with sub-surface (6-8") drip irrigation. Plots consisted of 4 beds, 50 feet long with a two bed buffer between the plots. Plots were arranged in a RCB design with four replications. The four Admire 2F chemigation treatments were applied once 54 d after planting (23 Jan) through the drip system during the last hour of the irrigation run. The two Metasystox-R chemigation treat­ ments were applied through the drip three times on 23 Jan, 1 and 8 Feb. The foliar Metasystox-R + Capture treatment was applied at 60 PSI in 20 gpa to­ tal volume on 23 Jan, 1 and 8 Feb. Insect data were collected only from the inner two beds of each plot. Aphid densities were estimated bi-weekly by sam­ pling 10 plants per replicate and counting the total number of aphids per plant. Data were analyzed as a 1-way ANOVA using a protected LSD F test to distinguish treatment mean differences. The two aphid species varied in relative abundance throughout the study. Admire applied at rates of 10 oz/acre or greater provided consistent con­ trol of aphids. Admire applied at 5 oz appeared to maintain low numbers near harvest, but 5% of the heads were found to be heavily infested (>10 aphids/head) at harvest. The Metasystox-R (32 oz) chemigation treatment provided control comparable to the Admire chemigation treatments. No phyto- toxicity was observed. Mean no. apterous aphids/plant Treatment 30 Dec 14 Jan 28 Jan 12 Feb 26 Feb 11 Mar Rate" Admire 2F 0.2a 4.1a 9.8b 4.3c 11.2cd 8.6d 20 oz Admire 2F 0.1a 4.2a 11.4b 4.9c 4.1d 10. le d 15 oz Admire 2F 10 oz 0.1a 5.3a 10.4b 12.1c 11.3bcd 9.6cd 8.6d Admire 2F 5 oz 0.0a 7.1a 18.3ab 10.3c 23.4abc Metasystox R 16 oz 0.0a 5.2a 19.8ab 58.4ab 38.4ab 50.2b Metasystox R 32 oz 0.1a 4.4a 32.0a 92.2a 11.8bcd ll.Obcd Metasystox R +Capture 2EC 32 oz + 5 oz 0.0a 6.2a 13.2b 16.3bc 19.8bc 25.8bc Untreated Check 1.0 0.1a 5.0a 34.5a 88.5a 70.4a 212.7a Means within columns followed by the same letter are not significantly different (P = 0.05), protected LSD. "Rate expressed as volume of formulated product/acre. MUSTARD: Brassica campestris L., 'Savanah' J. V. Edelson and M. Peters (62E) Turnip aphid; Lipaphis erysimi (Kaltenbach) Oklahoma State Univ./WWAREC Lane, OK 74555 405-889-7343 CONTROL OF APHIDS ON MUSTARD IN A COMMERCIAL FIELD, 1996: A commercial production field of mustard was used for this trial. Plants were grown in 6 row beds on 6 ft centers. The field was direct seeded in Apr approximately 1 mile west of Webbers Falls, OK. Small plots were delimited on one edge of the field. The experimental design was a RCB with 4 replicates and 7 treatments. Insecticide applications were made on 23 and 29 May using a bicycle tire mounted sprayer with 4 hollow cone nozzles (TXVS26) per bed applying 40 gpa solution at 42 psi. Plots were 1 bed wide and 20 ft long with 5 ft alleys between plots. Insect populations were surveyed by examining 5 plants per plot on 29 Ma y (prior to the second application of insecticides) and 3 Jun to determine treatment effects. Aphid population infestations were minimal throughout the study period. Aphistar and Provado provided best control of aphids, reducing their pop­ ulations significantly below the levels in the untreated as well as other treatment plots. Mean no. aphids/5 plants" Treatment Rate/acre 30 May 3 Jun Permethrin O.llb(AI) lie 22 a Dimethoate 0.25 lb (AI) 13 c 12ab Methomyl 0.9 lb (AI) 10 c 10 ab Untreated Check 16 c 5 be Endosulfan 0.75 lb (AI) 7 c 2 c Aphistar 0.12 lb (AI) 3 a <1 d Provado 1.6 3.75 oz 5 b <1 d Means in a column followed by differing letters are significantly different. Data analyzed using SAS after log 10 transformation; means separated using LSD at P = 0.1 ; untransformed mean values reported. "Aphids were primarily turnip aphids.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1997

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