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(F31) PEANUT: Arachis hypogaea L., 'Gregory' EVALUATION OF SELECTED FOLIAR APPLIED INSECTICIDES FOR CONTROL OF THRIPS IN VIRGINIA PEANUT, 2005 D. A. Herbert, Jr. Virginia Tech Tidewater Agric. Res. & Ext. Ctr. 6321 Holland Road Suffolk, VA 23437 Phone: (757) 657-6450, Ext. 122 Fax: (757) 657-9333 E-mail: herbert@vt.edu S. Malone Tobacco thrips (TT): Frankliniella fusca (Hinds) Selected insecticides applied as foliar broadcasts both at late ground cracking and again in two weeks (BC at late GC + 2 wk) were evaluated for control of thrips in virginia-type peanut. 'Gregory' peanut was planted on 5 May at the Virginia Tech Tidewater Agric. Res. & Ext. Ctr., Suffolk, VA, using 36-inch row spacing. The foliar treatments were applied with a CO -pressurized backpack sprayer as a broadcast at 14.3 gpa and 18 psi through 8002VS nozzles spaced 18 inches apart on the spray boom. Foliar applications were made on 26 or 27 May at the late ground cracking stage and two weeks later on 9 Jun. A RCB design was used with four replicates; plots were four rows by 40 ft. Thrips injury to plants was determined by visually rating injury using a 0 to 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. Yield was determined from digging, drying and combining peanuts from the two center rows of each plot. Data were analyzed using ANOVA and LSD (P = 0.01). Thrips injury increased each week that ratings were taken in all treatments. The untreated check reached an injury level of 5.6 on 22 Jun. All treatments had significantly lower plant injury levels compared with the untreated check on all sample dates. Orthene 97 (BC at late GC + 2 wk), which was included as an insecticide standard, had significantly lower injury levels than all other treatments on 16 and 22 Jun. All treatments resulted in significantly higher yields compared with the untreated check, but there were no significant yield differences between treatments. Yield increases compared with the untreated check averaged 527 lb/acre and ranged from 379 to 678 lb/acre. Thrips injury rating Treatment/ Rate Application Yield a c formulation lb (AI)/acre timing 1 Jun 9 Jun 16 Jun 22 Jun lb/acre Danitol-J EC 0.2 BC at late GC + 2 wk 1.13cd 1.69d 2.75bc 3.00c 4791a Danitol-I EC 0.2 BC at late GC + 2 wk 1.19cd 1.75cd 2.69c 3.00c 4734a Orthene 97S 0.36 BC at late GC + 2 wk 1.19cd 1.75cd 1.56e 1.88g 4928a Assail 30SG 0.043 BC at late GC + 2 wk 1.25c 2.06b 2.56c 2.81d 4629a Novaluron 0.83EC 0.058 BC at late GC + 2 wk + Induce 0.125% v/v 1.50b 1.75cd 2.13d 2.50e 4712a Novaluron 0.83EC 0.078 BC at late GC + 2 wk + Induce 0.125% v/v 1.13cd 2.00bc 2.06d 2.31f 4869a Karate Z 2.08CS 0.02 BC at late GC + 2 wk 1.00d 1.69d 3.00b 3.50b 4736a Prolex 1.25EC 0.01 BC at late GC + 2 wk 1.19cd 1.38e 2.81bc 2.94cd 4815a Untreated check -- -- 1.88a 2.75a 5.31a 5.63a 4250b LSD 0.20 0.29 0.27 0.18 313.5 Means within a column followed by the same letter(s) are not significantly different (LSD, P > 0.01). Applied as a foliar broadcast (BC) applications on 26 or 27 May at late ground cracking (GC) stage and 2 wks later on 9 Jun. Thrips injury rated on a 0-10 scale, 0=no thrips and 10=dead plants. Yield based on weight of peanut with moisture content of 7%. Peanuts were dug on 27 Sep and harvested on 3 Oct.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2006
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