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Control of Diamondback Moth (Dbm) with Emamectin and Bacillus Thuringiensis Endotoxins, 1996

Control of Diamondback Moth (Dbm) with Emamectin and Bacillus Thuringiensis Endotoxins, 1996 Downloaded from https://academic.oup.com/amt/article-abstract/22/1/111/4640029 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 22 111 CABBAGE: Brassia oleracea capitata L. 'Solid Blue' P. A. Stansly & J. M. Conner (3 IE ) University of Florida/FAS Diamondback moth (DBM) Plutella xylostella (L.) SW Florida Res. & Ed. Ctr. Immokalee, FL 33934 (941)675-723 5 CONTROL OF DIAMONDBACK MOTH (DBM) WITH EMAMECTIN AND BACILLUS THURINGIENSIS ENDOTOXINS, 1996: Six beds 32 inches wide and 240 ft long were fumigated with methyl bromide/chloropicrin 67/33 at a rate of .220 lbs/acre, fertilized with a bottom mix of 800 lbs/acre 5-16-8 and a top mix of 500 lbs/acre of 19-0-19, and covered with black polyethylene film. The center bed of each of 2 sets of 3 beds on 6-ft cen­ ters separated by a 15 ft drive middle was planted on 5 Dec 1995 with collard seedlings var 'Georgia' to provide target pest inoculum. Cabbage seedlings were transplanted 29 Jan into single rows on the remaining 4 beds at 18 inch spacing. Beds were subsurface irrigated with a semi-closed system and plants sprayed with Bravo 720 at 1.5 pt/acre for disease control. Each bed of cabbage was considered a block and divided into 7 plots 34 ft long in a RCB design with 4 replications and 7 treatments. A precount on 1 April of 20 plants per replication yielded an average 1 DBM larva and 0.8 DMB pupa per plant. Treatments were applied on 2, 11, and 17 Apr at a rate of 65 gpa using a high clearance sprayer equipped with 5 yellow hollow cone Albuz ceramic noz­ zles per row and operating at 200 psi of pressure. A nonionic surfactant, ASPA 80, was tank mixed at the rate of 16 oz/100 gal of spray which was made up with water at pH 7.2. Proclaim was not applied on 11 Apr at the request of the company representative. Ten randomly selected plants per plot were evaluated weekly 4 to 7 DAT. Five wrapper leaves and 3 inner (head) leaves per plant were inspected for larvae classified in 3 size categories. A damage rating was determined for each plant where 1 = no apparent damage, 2 = 0-1 % surface area damage to wrappers, 3 = 2-5 % damage to wrappers but none to head, 4 = 6-10% damage to wrappers, 0-5 % damage to head, 5 = 11-30% damage to wrappers, 5-1 5 damage to head 6 = >30% damage to wrap­ pers, 15% damage to head. Evaluations were recorded on Pesticide Research Manager version 4.06. The 15 largest heads in each plot were selected and graded for marketability on 25 Apr based on 2 levels of stringency: "Fancy" with no insect damage on the wrapper leaves or head, and "Standard" with less than 10% insect damage on wrapper leaves and less than 5% on the head, limited to the 2 outer leaves. A heavy infestation of DBM built up first in the inoculum rows of collards and migrated into the cabbage plots, especially toward the end of the trial. There were no significant differences in number of DBM larvae on 9 Apr but on 15 Apr, fewest larvae were seen on plants treated with Crymax, Mattch, Cry-I F and CRY-1C . Damage ratings were lowest for Mattch-treated plants. On 22 April, all Bt treatments had fewer larvae than Proclaim which had not been sprayed the previous week but still had fewer than the untreated check. Damage ratings were again lowest on plants treated with Mattch. Over all dates, larvae were fewest on Mattach-, Crymax- and Xentari-treated plants, although not significantly less than CRY-1C. Least damage was seen on plants treated with Mattch or Xentari, though not significantly less than the Crymax treatment. The highest number and weight of Fancy heads was har­ vested from plants receiving Mattch, although the weight of Fancy heads produced by Crymax-treated plants was not significantly different. The largest number of marketable heads (Fancy + Standard) was produced by plants sprayed with Xentari, Mattch or Crymax, although not significantly more than with CRY-1C. The same treatments produced the highest weight of marketable heads with the addition of Proclaim. In summary, all treatments provided significant protection against DBM, but no treatment provided complete protection. Mattch, followed by Crymax, appeared to perform best over all crite­ ria, with Xentari and CRY-1C next in order. Proclaim-treated plants suffered from the missed application when pressure from DBM was most intense. MEAN NO. DBM LARVAE AND DAMAGE RATING FOR 10 PLANTS BY SAMPLE DATE. Apr. 9 Apr. 15 Apr. 22 Average Treatment/formulation Rate/acre DBM Damage DBM Damage DBM Damage DBM Damage Cry-IF 2.6 qt 0.45 2.92cd 0.55d 2.83de 0.40c 3.22cd 0.47d 2.99cd Cry-lC 2.2 qt 1.35 3.22bc 3.55b 3.47b 2.50b 3.67b 2.47b 3.46b Mattch 2.0 qt L92 3.40b 1.05d 3.17bc 0.33c 3.42bc 1.10c 3.33bc Proclaim . 16E 0.0075 lb(AI) 2.65 3.60ab 2.02c 3.30b 1.02c 3.65b 1.90b 3.52b CRYMAX WDG 1.0 1b 0.60 2.75d 0.42d 2.55e 0.05c 2.72e 0.36d 2.67d Untreated Check 0.78 2.83d 0.60d 2.90cd 0.82c 3.02de 0.73d 2.92d Xentari 0.5 1b 8.50 3.92a 7.60a 4.72a 7.83a 4.85a 7.97a 4.50a Means in the same column followed by the same letter are not significantly different (P < 0.05, Fisher's protected LSD) MEAN NO . AND WEIGHT (LB.) OF FANCY, AND STANDARD CABBAGE HEADS, TOTAL MARKETABLE AND NON-MARKETABLE HEADS O F THE 15 LARGES T HEADS PER PLOT Marketable Heads Non-Marketable Heads Fancy Standard Total formulation amt/acre No. Lb. No. Lb. No. Lb. No. Lb. Cry-IF 2.6 qt 5.50b 35.25a 8.50a 47.70ab 14.00a 82.95a 1.00c 7.18c Cry-lC 2.2 qt 0.75d 4.08cd 9.50a 59.35a 10.25b 63.43ab 4.75b 28.98b • Mattch 2.0qt 3.25bc 19.15bc 9.00a 57.18a 12.25ab 76.32ab 2.75bc 17.70bc i Proclaim . 16E 0.0075 lb (AI) 1.50cd 9.95bcd 8.75a 44.48ab 10.25b 54.43b 4.75b 25.12b i CRYMAX WDG 1.01b 8.25a 45.85a 5.75b 35.95b 14.00a 81.80a 1.00c 5.87c Xentari 0.5 1b 0.25d 1.25d 1.50c 7.45c 1.75c 8.70c 13.25a 74.37a 1 Untreated Check 43.25bc 19.57b 10.00a 57.95a 13.24a 77.53ab 1.75c 10.50c Means in the same column followed by the same letter are not significantly different (P < 0.05, Fisher's protected LSD) http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

Control of Diamondback Moth (Dbm) with Emamectin and Bacillus Thuringiensis Endotoxins, 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/22.1.111
Publisher site
See Article on Publisher Site

Abstract

Downloaded from https://academic.oup.com/amt/article-abstract/22/1/111/4640029 by DeepDyve user on 21 July 2020 E: VEGETABLE CROPS Arthropod Management Tests, Vol. 22 111 CABBAGE: Brassia oleracea capitata L. 'Solid Blue' P. A. Stansly & J. M. Conner (3 IE ) University of Florida/FAS Diamondback moth (DBM) Plutella xylostella (L.) SW Florida Res. & Ed. Ctr. Immokalee, FL 33934 (941)675-723 5 CONTROL OF DIAMONDBACK MOTH (DBM) WITH EMAMECTIN AND BACILLUS THURINGIENSIS ENDOTOXINS, 1996: Six beds 32 inches wide and 240 ft long were fumigated with methyl bromide/chloropicrin 67/33 at a rate of .220 lbs/acre, fertilized with a bottom mix of 800 lbs/acre 5-16-8 and a top mix of 500 lbs/acre of 19-0-19, and covered with black polyethylene film. The center bed of each of 2 sets of 3 beds on 6-ft cen­ ters separated by a 15 ft drive middle was planted on 5 Dec 1995 with collard seedlings var 'Georgia' to provide target pest inoculum. Cabbage seedlings were transplanted 29 Jan into single rows on the remaining 4 beds at 18 inch spacing. Beds were subsurface irrigated with a semi-closed system and plants sprayed with Bravo 720 at 1.5 pt/acre for disease control. Each bed of cabbage was considered a block and divided into 7 plots 34 ft long in a RCB design with 4 replications and 7 treatments. A precount on 1 April of 20 plants per replication yielded an average 1 DBM larva and 0.8 DMB pupa per plant. Treatments were applied on 2, 11, and 17 Apr at a rate of 65 gpa using a high clearance sprayer equipped with 5 yellow hollow cone Albuz ceramic noz­ zles per row and operating at 200 psi of pressure. A nonionic surfactant, ASPA 80, was tank mixed at the rate of 16 oz/100 gal of spray which was made up with water at pH 7.2. Proclaim was not applied on 11 Apr at the request of the company representative. Ten randomly selected plants per plot were evaluated weekly 4 to 7 DAT. Five wrapper leaves and 3 inner (head) leaves per plant were inspected for larvae classified in 3 size categories. A damage rating was determined for each plant where 1 = no apparent damage, 2 = 0-1 % surface area damage to wrappers, 3 = 2-5 % damage to wrappers but none to head, 4 = 6-10% damage to wrappers, 0-5 % damage to head, 5 = 11-30% damage to wrappers, 5-1 5 damage to head 6 = >30% damage to wrap­ pers, 15% damage to head. Evaluations were recorded on Pesticide Research Manager version 4.06. The 15 largest heads in each plot were selected and graded for marketability on 25 Apr based on 2 levels of stringency: "Fancy" with no insect damage on the wrapper leaves or head, and "Standard" with less than 10% insect damage on wrapper leaves and less than 5% on the head, limited to the 2 outer leaves. A heavy infestation of DBM built up first in the inoculum rows of collards and migrated into the cabbage plots, especially toward the end of the trial. There were no significant differences in number of DBM larvae on 9 Apr but on 15 Apr, fewest larvae were seen on plants treated with Crymax, Mattch, Cry-I F and CRY-1C . Damage ratings were lowest for Mattch-treated plants. On 22 April, all Bt treatments had fewer larvae than Proclaim which had not been sprayed the previous week but still had fewer than the untreated check. Damage ratings were again lowest on plants treated with Mattch. Over all dates, larvae were fewest on Mattach-, Crymax- and Xentari-treated plants, although not significantly less than CRY-1C. Least damage was seen on plants treated with Mattch or Xentari, though not significantly less than the Crymax treatment. The highest number and weight of Fancy heads was har­ vested from plants receiving Mattch, although the weight of Fancy heads produced by Crymax-treated plants was not significantly different. The largest number of marketable heads (Fancy + Standard) was produced by plants sprayed with Xentari, Mattch or Crymax, although not significantly more than with CRY-1C. The same treatments produced the highest weight of marketable heads with the addition of Proclaim. In summary, all treatments provided significant protection against DBM, but no treatment provided complete protection. Mattch, followed by Crymax, appeared to perform best over all crite­ ria, with Xentari and CRY-1C next in order. Proclaim-treated plants suffered from the missed application when pressure from DBM was most intense. MEAN NO. DBM LARVAE AND DAMAGE RATING FOR 10 PLANTS BY SAMPLE DATE. Apr. 9 Apr. 15 Apr. 22 Average Treatment/formulation Rate/acre DBM Damage DBM Damage DBM Damage DBM Damage Cry-IF 2.6 qt 0.45 2.92cd 0.55d 2.83de 0.40c 3.22cd 0.47d 2.99cd Cry-lC 2.2 qt 1.35 3.22bc 3.55b 3.47b 2.50b 3.67b 2.47b 3.46b Mattch 2.0 qt L92 3.40b 1.05d 3.17bc 0.33c 3.42bc 1.10c 3.33bc Proclaim . 16E 0.0075 lb(AI) 2.65 3.60ab 2.02c 3.30b 1.02c 3.65b 1.90b 3.52b CRYMAX WDG 1.0 1b 0.60 2.75d 0.42d 2.55e 0.05c 2.72e 0.36d 2.67d Untreated Check 0.78 2.83d 0.60d 2.90cd 0.82c 3.02de 0.73d 2.92d Xentari 0.5 1b 8.50 3.92a 7.60a 4.72a 7.83a 4.85a 7.97a 4.50a Means in the same column followed by the same letter are not significantly different (P < 0.05, Fisher's protected LSD) MEAN NO . AND WEIGHT (LB.) OF FANCY, AND STANDARD CABBAGE HEADS, TOTAL MARKETABLE AND NON-MARKETABLE HEADS O F THE 15 LARGES T HEADS PER PLOT Marketable Heads Non-Marketable Heads Fancy Standard Total formulation amt/acre No. Lb. No. Lb. No. Lb. No. Lb. Cry-IF 2.6 qt 5.50b 35.25a 8.50a 47.70ab 14.00a 82.95a 1.00c 7.18c Cry-lC 2.2 qt 0.75d 4.08cd 9.50a 59.35a 10.25b 63.43ab 4.75b 28.98b • Mattch 2.0qt 3.25bc 19.15bc 9.00a 57.18a 12.25ab 76.32ab 2.75bc 17.70bc i Proclaim . 16E 0.0075 lb (AI) 1.50cd 9.95bcd 8.75a 44.48ab 10.25b 54.43b 4.75b 25.12b i CRYMAX WDG 1.01b 8.25a 45.85a 5.75b 35.95b 14.00a 81.80a 1.00c 5.87c Xentari 0.5 1b 0.25d 1.25d 1.50c 7.45c 1.75c 8.70c 13.25a 74.37a 1 Untreated Check 43.25bc 19.57b 10.00a 57.95a 13.24a 77.53ab 1.75c 10.50c Means in the same column followed by the same letter are not significantly different (P < 0.05, Fisher's protected LSD)

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 1997

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