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HORNWORM AND BUDWORM CONTROL ON FLUE-CURED TOBACCO, 2001

HORNWORM AND BUDWORM CONTROL ON FLUE-CURED TOBACCO, 2001 (F120) TOBACCO: Nicotiana tabacum L., 'K 326' Paul J. Semtner and William Wilkinson, III Virginia Tech Southern Piedmont Agricultural Research and Extension Center 2375 Darvills Road Blackstone, VA 23824 USA Phone: (434) 292-5331 Fax: (434) 292-5623 E-mail: psemtner@vt.edu Tobacco budworm: Heliothis virescens (F.) Tobacco hornworm (THW): Manduca sexta (L.) Two tests were conducted at the Southern Piedmont AREC, Blackstone, VA, to evaluate various foliar insecticides for TBW and THW control on flue-cured tobacco. Tobacco 'K 326' was transplanted into experimental plots 8 by 40 ft (2 rows by 25 plants) on 2 May. Tobacco in the border rows was cut back on 20 Jul, and test 2 was established on the regrowth. Admire was applied at 1.4 fl oz/1,000 plants as a tray drench treatment to the transplants 1 d before transplanting to control green peach aphids, Myzus persicae (Sulzer), and tobacco flea beetles, Epitrix hirtipennis (Melsheimer). Each test consisted of 15 treatments and an untreated check arranged in RCB designs with four replications (Tables 1 and 2). Test plots were artificially infested with one 2- to 3-day-old TBW larva in the bud of each plant 1 day before application in each test. High numbers of THW larvae and eggs occurred naturally in Test 2. Foliar insecticide treatments were applied with a CO -pressurized backpack sprayer that delivered 30 gpa through TX-12 nozzles (3 per row) at 50 psi on 30 Jun. On 3 Aug, treatments were applied with a DeCloet high clearance CO - pressurized sprayer that delivered 24 gal/acre at 40 psi and used 3 TX-12 nozzles/row. TBW were counted on 20 plants/row at 3, 7, and 13 DAT in Test 1 and at 3, 7, and 14 in Test 2. THW on 10 plants/plot were counted at 3, 7, and 14 in Test 2. In Test 1, 0.4 inch of precipitation fell 4 DAT. For Test 2, 0.94 inch of rainfall occurred 1 DAT. Data were analyzed by ANOVA and significantly different means were separated by WD (P = 0.05). Before analysis, insect count data were transformed to the square root (x + 0.5). Actual means are presented in the tables. In Test 1, TBW populations were relatively low in the untreated check at 3, 7, and 13 DAT (Table 1). V10101 and Dipel ES generally had the highest numbers of TBW in this test. The Tracer, Denim, Orthene, and Orthene + V-10101 combination gave moderate TBW control (Table 1). In Test 2, the most effective treatments for TBW control at 7 DAT were the high rate of Tracer, and Denim with and without Dyne- Amic (Table 1). The least effective treatments were S-1812 + V-10101, V-10101, and Dipel ES. All treatments gave good to excellent initial control of THW (Table 2). The least control at 7 and 14 DAT were in plots treated with S-1812, Tracer, and Dipel ES. Leaf loss from THW and TBW feeding was most severe in plots treated with Tracer, Dipel ES, and the combination of S-1812 + Orthene 97 (Table 2). No phytotoxicity was observed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

HORNWORM AND BUDWORM CONTROL ON FLUE-CURED TOBACCO, 2001

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Oxford University Press
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© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/27.1.F120
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Abstract

(F120) TOBACCO: Nicotiana tabacum L., 'K 326' Paul J. Semtner and William Wilkinson, III Virginia Tech Southern Piedmont Agricultural Research and Extension Center 2375 Darvills Road Blackstone, VA 23824 USA Phone: (434) 292-5331 Fax: (434) 292-5623 E-mail: psemtner@vt.edu Tobacco budworm: Heliothis virescens (F.) Tobacco hornworm (THW): Manduca sexta (L.) Two tests were conducted at the Southern Piedmont AREC, Blackstone, VA, to evaluate various foliar insecticides for TBW and THW control on flue-cured tobacco. Tobacco 'K 326' was transplanted into experimental plots 8 by 40 ft (2 rows by 25 plants) on 2 May. Tobacco in the border rows was cut back on 20 Jul, and test 2 was established on the regrowth. Admire was applied at 1.4 fl oz/1,000 plants as a tray drench treatment to the transplants 1 d before transplanting to control green peach aphids, Myzus persicae (Sulzer), and tobacco flea beetles, Epitrix hirtipennis (Melsheimer). Each test consisted of 15 treatments and an untreated check arranged in RCB designs with four replications (Tables 1 and 2). Test plots were artificially infested with one 2- to 3-day-old TBW larva in the bud of each plant 1 day before application in each test. High numbers of THW larvae and eggs occurred naturally in Test 2. Foliar insecticide treatments were applied with a CO -pressurized backpack sprayer that delivered 30 gpa through TX-12 nozzles (3 per row) at 50 psi on 30 Jun. On 3 Aug, treatments were applied with a DeCloet high clearance CO - pressurized sprayer that delivered 24 gal/acre at 40 psi and used 3 TX-12 nozzles/row. TBW were counted on 20 plants/row at 3, 7, and 13 DAT in Test 1 and at 3, 7, and 14 in Test 2. THW on 10 plants/plot were counted at 3, 7, and 14 in Test 2. In Test 1, 0.4 inch of precipitation fell 4 DAT. For Test 2, 0.94 inch of rainfall occurred 1 DAT. Data were analyzed by ANOVA and significantly different means were separated by WD (P = 0.05). Before analysis, insect count data were transformed to the square root (x + 0.5). Actual means are presented in the tables. In Test 1, TBW populations were relatively low in the untreated check at 3, 7, and 13 DAT (Table 1). V10101 and Dipel ES generally had the highest numbers of TBW in this test. The Tracer, Denim, Orthene, and Orthene + V-10101 combination gave moderate TBW control (Table 1). In Test 2, the most effective treatments for TBW control at 7 DAT were the high rate of Tracer, and Denim with and without Dyne- Amic (Table 1). The least effective treatments were S-1812 + V-10101, V-10101, and Dipel ES. All treatments gave good to excellent initial control of THW (Table 2). The least control at 7 and 14 DAT were in plots treated with S-1812, Tracer, and Dipel ES. Leaf loss from THW and TBW feeding was most severe in plots treated with Tracer, Dipel ES, and the combination of S-1812 + Orthene 97 (Table 2). No phytotoxicity was observed.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2002

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