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Arthropod Management Tests, 2016, 1–2 doi: 10.1093/amt/tsw083 Section F: Field & Cereal Crops CORN: Zea mays L., ‘DeKalb DKC62-98RIB’ and ‘DeKalb DKC62-77RIB’ Evaluation of Smartstax Traited and Refuge Corn Hybrids in Combination With Soil Insecticides at Planting for Larval Corn Rootworm Control, 2015 1 2,3 Terry A. DeVries and Robert J. Wright South Central Agricultural Laboratory, University of Nebraska-Lincoln, 202 W. Fairfield St., P.O. Box 66, Clay Center, NE 68933, Phone: (402) 762-3536, Fax: (402) 762-3017 (tdevries1@unl.edu), Department of Entomology, University of Nebraska-Lincoln, 213 Entomology Hall, Lincoln NE 68583-0816 (rwright2@unl.edu) and Corresponding author, e-mail: rwright2@unl.edu Subject Editor: Clyde Sorenson Corn (hybrid, maize, sweet) j Zea mays Western corn rootworm j Diabrotica virgifera LeConte SmartStax traited and refuge corn hybrids in combination with soil the stalk, 2 ¼ two nodes of roots pruned to within 1.5 inches of the insecticides were evaluated for effectiveness for larval corn root- stalk, 3 ¼ three or more nodes of roots pruned to within 1.5 inches worm (CRW) control near Clay Center, NE during 2015. The trial of the stalk). Plots were machine harvested on 08 Oct. Percent mois- site was late-planted corn and pumpkins (insecticide free) during ture and lbs of grain were recorded and corrected to 56 lbs/bu at 2014. Experimental design was a RCB with four replicates. Plot size 15.5% moisture to evaluate yield levels. Data were analyzed by was 4 rows 150 ft length with 30-inch row spacing. Soil type PROC MIXED with mean separation using differences of least was a Crete silt loam. ‘DeKalb DKC62-77 RIB’ (contains square means (P ¼ 0.05). GENSSRIB [SmartStax] insect and herbicide traits) and ‘DeKalb From planting (30 Apr) to larval feeding damage evaluation (23 DKC62-98RIB’ (contains GENVT2PRIB [refuge] insect and herbi- Jul), rainfall totaled 16.75 inches, and overhead irrigation, 1.36 cide traits) corn hybrids were planted on 30 Apr with a two-row JD inches. Mean root injury ratings (Iowa 0–3 Scale) for the untreated 7100 Maximerge planter with finger pickup seed units. A southeast GENSSRIB corn hybrid averaged 0.13. Planting-time IF applications wind at 10–13 mph occurred at planting. Liquid insecticides were of Precept 3G to the GENSSRIB corn hybrid did not significantly re- applied infurrow (IF) in either 5 gallons per acre (GPA) water or 10- duce root injury ratings or enhance final grain yield levels. Mean 34-0 starter fertilizer solution via a CO pressurized system. root injury ratings (Iowa 0–3 Scale) for the untreated GENVT2PRIB Granular insecticides were applied IF via the SmartBox application corn hybrid averaged 0.95 and 1.18 (with application of 5 GPA 10- system. Initial CRW egg hatch was first documented on 08 Jun. The 34-0 starter fertilizer). With the exception of Capture LFR, Counter total number of plants per plot was recorded on 09 Jun and con- 20G, Lorsban 15G, and Warrior II, planting-time soil insecticides verted to plants per acre (PPA). Initial adult CRW emergence was applied to GENVT2PRIB traited corn statistically enhanced root in- witnessed on 10 Jul. The total number of root lodged plants due to jury protection and reduced late season root lodging compared to larval CRW feeding per plot was recorded on 20 Jul and 17 Sept the untreated GENVT2PRIB plots. Final grain yields of SmartStax and converted to percentage of lodged plants. Larval feeding dam- traited and refuge corn hybrids in combination with soil insecticides age was evaluated on 23 Jul. Five randomly selected plants were dug were not significantly different. This research was supported by in- from each plot, washed, and rated using the Iowa State 0–3 scale (0 dustry gifts of pesticide and research funding. ¼ no feeding, 1 ¼ one node of roots pruned to within 1.5 inches of V C The Authors 2016. Published by Oxford University Press on behalf of Entomological Society of America. 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com 2 Arthropod Management Tests, 2016, Vol. 41, No. 1 Table 1 Treatment/formulation Rate-amt Placement Yield Late season Root injury % Root PPA form /1,000 (bu/acre) % root rating lodging row ft lodging at root dig GENVT2PRIB 3 oz IF 243.2 18.2 abc 0.51 c 0.2 ab 33,019 þ Aztec 4.67G GENSSRIB 242.9 0.1 a 0.13 ab 0.4 ab 31,827 GENVT2PRIB 0.46 fl oz IF 239.1 11.8 ab 0.49 bc 0.0 a 33,077 þ Force CS GENVT2PRIB 4 oz IF 238.6 16.8 abc 0.51 c 0.2 ab 32,804 þ Precept 3G GENSSRIB 4 oz IF 238.2 0.1 a 0.08 a 0.1 a 31,674 þ Precept 3G GENVT2PRIB 6 oz IF 236.3 37.6 bcd 1.12 e 0.9 ab 32,562 þ Counter 20G GENVT2PRIB 0.33 fl oz IF 235.6 46.9 de 0.99 e 2.6 abc 32,949 þ Warrior II GENVT2PRIB 0.49 fl oz IF 232.0 38.3 cd 0.62 cd 2.0 abc 32,938 þ Capture LFR GENVT2PRIB 0.49 fl oz IF 231.2 56.3 de 0.99 e 3.3 bcd 33,012 þ Capture LFR GENVT2PRIB 8 oz IF 226.9 54.3 de 0.83 cde 6.4 de 32,984 þ Lorsban 15G GENVT2PRIB 220.9 54.7 de 0.95 de 7.7 e 32,537 GENVT2PRIB 219.7 66.4 e 1.18 e 4.5 cde 33,676 P 0.2385 <0.0001 <0.0001 <0.0001 0.1556 Means in column followed by the same lower case letter are not statistically different using the differences of least square means (MIXED; pjtj > 0.05). Granular insecticide applied via the SmartBox application system at planting. Liquid insecticide applied in a 5 GPA water solution at planting. Liquid insecticide, treatment applied with 5 GPA 10-34-0 starter fertilizer solution at planting.
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2016
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