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IMPACT OF SELECTED IN-FURROW AND FOLIAR APPLIED INSECTICIDES ON TOBACCO THRIPS INJURY AND INCIDENCE OF TOMATO SPOTTED WILT VIRUS (TSWV) IN VIRGINIA-TYPE PEANUT, 2002

IMPACT OF SELECTED IN-FURROW AND FOLIAR APPLIED INSECTICIDES ON TOBACCO THRIPS INJURY AND... (F82) PEANUT: Arachis hypogaea L., 'Perry' IMPACT OF SELECTED IN-FURROW AND FOLIAR APPLIED INSECTICIDES ON TOBACCO THRIPS INJURY AND INCIDENCE OF TOMATO SPOTTED WILT VIRUS (TSWV) IN VIRGINIA-TYPE PEANUT, 2002 D. A. Herbert Jr Virginia Tech Tidewater Agric. Res. & Ext.Ctr. 6321 Holland Road Suffolk, Virginia 23437 Tel: (757) 657-6450, Ext. 122 Fax: (757) 657-9333 herbert@vt.edu P. M. Phipps C. W. Swann S. Malone Tobacco thrips (TT): Frankliniella fusca (Hinds) Two field tests were conducted to evaluate selected foliar (Test 1) and in-furrow (Test 2) applied insecticides for impact on plant injury by Tobacco thrips (TT) and incidence of TSWV in virginia-type peanut. 'Perry' peanut was planted on 7 May at the virginia Tech Tidewater Agric. Res. & Ext. Ctr, Suffolk, VA, using 36-inch row spacing. In Test 1, Orthene 97 was applied either one (20 May), two (20 May & 13 Jun), three (20 May, 13 & 27 Jun), or 4 (20 May, 13, 27 Jun, & 11 Jul) times to plots treated with Temik 15G in-furrow at 1.0 lb (AI)/acre. Foliar applications were broadcast with a CO pressurized backpack sprayer calibrated to deliver 14.3 gpa at 18 psi through 8002VS nozzles spaced 18 inch apart on the spray boom. In-furrow treatments (IF) were applied into the seed furrow at the time of planting using tractor- mounted inverted jars with lid holes calibrated to deliver exact amounts via gravity. In Test 2, all treatments were applied in-furrow at planting. Granules were applied as described in Test 1. Liquids were applied with a tractor-mounted CO pressurized sprayer calibrated to deliver 5 gpa at 32 psi through a micro tube mounted to deliver a liquid stream into the seed furrow. A randomized complete block experimental design was used with four replicates; plots were 4 rows x 40 ft. TT injury was evaluated based on a 0-10 scale where, 0 = no thrips induced plant injury, 1 = 10% injured leaves, 2 = 20% injured leaves, 3 = 30% injured leaves, 4 = 40% injured leaves, 5 = > 50% injured leaves + < 5% terminal buds injured, 6 = > 50% injured leaves + 25% terminal buds injured, 7 = > 50% injured leaves + 50% terminal buds injured, 8 = > 50% injured leaves + 75% terminal buds injured, 9 = > 50% injured leaves + > 90% terminal buds injured, and 10 = dead plants. Incidence of TSWV was determined based on counting the total number of plants showing disease symptoms in the center two rows of each plot. Yield was determined from digging, drying and combining peanuts from the two center rows of each plot. Data were analyzed using ANOVA and LSD procedures. Test 1 - Thrips injury to plants was reduced significantly with foliar treatments compared with the control that was treated with Temik 15G in-furrow, alone. Although some statistical differences occurred among number of foliar application treatments, these differences were not meaningful. Incidence of TSWV was also reduced with foliar sprays, compared with the control, but not until 26 Aug. Again, there was no difference among number of foliar application treatments. There were no significant differences among treatment yields. Test 2 - Thrips injury to plants was reduced significantly with all treatments compared with the untreated check, and on all assessment dates. On 10 and 17 Jun, treatment efficacy separated statistically among treatments with Thimet 20G resulting in the least injury, then Temik 15G, then Orthene 97. All treatments resulted in significantly less virus (except on the first evaluation date) and there were no differences among treatments. All treatments resulted in significantly higher yields compared with the untreated check and there were no differences among treatments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Arthropod Management Tests Oxford University Press

IMPACT OF SELECTED IN-FURROW AND FOLIAR APPLIED INSECTICIDES ON TOBACCO THRIPS INJURY AND INCIDENCE OF TOMATO SPOTTED WILT VIRUS (TSWV) IN VIRGINIA-TYPE PEANUT, 2002

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Publisher
Oxford University Press
Copyright
© Published by Oxford University Press.
eISSN
2155-9856
DOI
10.1093/amt/28.1.F82
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Abstract

(F82) PEANUT: Arachis hypogaea L., 'Perry' IMPACT OF SELECTED IN-FURROW AND FOLIAR APPLIED INSECTICIDES ON TOBACCO THRIPS INJURY AND INCIDENCE OF TOMATO SPOTTED WILT VIRUS (TSWV) IN VIRGINIA-TYPE PEANUT, 2002 D. A. Herbert Jr Virginia Tech Tidewater Agric. Res. & Ext.Ctr. 6321 Holland Road Suffolk, Virginia 23437 Tel: (757) 657-6450, Ext. 122 Fax: (757) 657-9333 herbert@vt.edu P. M. Phipps C. W. Swann S. Malone Tobacco thrips (TT): Frankliniella fusca (Hinds) Two field tests were conducted to evaluate selected foliar (Test 1) and in-furrow (Test 2) applied insecticides for impact on plant injury by Tobacco thrips (TT) and incidence of TSWV in virginia-type peanut. 'Perry' peanut was planted on 7 May at the virginia Tech Tidewater Agric. Res. & Ext. Ctr, Suffolk, VA, using 36-inch row spacing. In Test 1, Orthene 97 was applied either one (20 May), two (20 May & 13 Jun), three (20 May, 13 & 27 Jun), or 4 (20 May, 13, 27 Jun, & 11 Jul) times to plots treated with Temik 15G in-furrow at 1.0 lb (AI)/acre. Foliar applications were broadcast with a CO pressurized backpack sprayer calibrated to deliver 14.3 gpa at 18 psi through 8002VS nozzles spaced 18 inch apart on the spray boom. In-furrow treatments (IF) were applied into the seed furrow at the time of planting using tractor- mounted inverted jars with lid holes calibrated to deliver exact amounts via gravity. In Test 2, all treatments were applied in-furrow at planting. Granules were applied as described in Test 1. Liquids were applied with a tractor-mounted CO pressurized sprayer calibrated to deliver 5 gpa at 32 psi through a micro tube mounted to deliver a liquid stream into the seed furrow. A randomized complete block experimental design was used with four replicates; plots were 4 rows x 40 ft. TT injury was evaluated based on a 0-10 scale where, 0 = no thrips induced plant injury, 1 = 10% injured leaves, 2 = 20% injured leaves, 3 = 30% injured leaves, 4 = 40% injured leaves, 5 = > 50% injured leaves + < 5% terminal buds injured, 6 = > 50% injured leaves + 25% terminal buds injured, 7 = > 50% injured leaves + 50% terminal buds injured, 8 = > 50% injured leaves + 75% terminal buds injured, 9 = > 50% injured leaves + > 90% terminal buds injured, and 10 = dead plants. Incidence of TSWV was determined based on counting the total number of plants showing disease symptoms in the center two rows of each plot. Yield was determined from digging, drying and combining peanuts from the two center rows of each plot. Data were analyzed using ANOVA and LSD procedures. Test 1 - Thrips injury to plants was reduced significantly with foliar treatments compared with the control that was treated with Temik 15G in-furrow, alone. Although some statistical differences occurred among number of foliar application treatments, these differences were not meaningful. Incidence of TSWV was also reduced with foliar sprays, compared with the control, but not until 26 Aug. Again, there was no difference among number of foliar application treatments. There were no significant differences among treatment yields. Test 2 - Thrips injury to plants was reduced significantly with all treatments compared with the untreated check, and on all assessment dates. On 10 and 17 Jun, treatment efficacy separated statistically among treatments with Thimet 20G resulting in the least injury, then Temik 15G, then Orthene 97. All treatments resulted in significantly less virus (except on the first evaluation date) and there were no differences among treatments. All treatments resulted in significantly higher yields compared with the untreated check and there were no differences among treatments.

Journal

Arthropod Management TestsOxford University Press

Published: Jan 1, 2003

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