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Arthropod Management Tests 2010, Vol. 35 doi: 10.4182/amt.2010.M1 M1 SOYBEAN: Glycine max L. Jack S. Bacheler Box 7613, Dept. of Entomology North Carolina State University Raleigh, NC 27695-7613 Phone: (919) 515- 8877 E-mail: jack_bacheler@ncsu.edu Dan W. Mott Box 7613, Dept. of Entomology E-mail: dan_mott@ncsu.edu James Dunphy Box 7620, Dept. of Crop Science E-mail: jim_dunphy@ncsu.edu Lesser corn stalk borer (LCSB): Elasmopalpus lignosellus (Zeller) Soybean varieties were planted clean till with a John Deere MaxEmerge 2, four-row planter on 10 Jun on a Conetoe loamy soil at a rate of approximately 126,000 seed/acre sand at a depth of 1.25 inches near Winsor. Plots were eight, 15-inch rows by 50 ft with four replicates in a RCBD. The LCSB damage was evaluated by inspecting the middle two rows of each plot (100 ft/plot) for the presence of lodged, potentially lodged, dead plants. This evaluation entailed slowly crawling along the assessed rows and bending each plant from side to side to confirm that the lodging or potential lodging (plant weakness and the soil line with evidence of LCSB damage) was a result of LCSB feeding. All impacted and healthy plants were recorded. Plots were harvested on 30 Nov with a Massey Furguson MF 8 research plot machine with a 6.25 ft header. LCSB damage varied widely between the varieties, from a low of 9.1% to a high of 30.6%, with a number of statistically-significant differences noted. The three varieties with the lowest LCSB damage numerically were developed for drought tolerance from the North Carolina State University breeding program. These varieties (NC01-11771, NC01-11777, and NC01-7432) showed statistically less LCSB damage than three standard North Carolina varieties (NC Raleigh, Haskell, and Benning). Of the drought tolerant lines, the yield of line with the highest LCSD damage (NC01-11136) was the lowest yielder numerically, and was also a lower statistically than two of the four remaining varieties in this category. This test points out the need to assess varieties grown on drought-prone soils for susceptibility to LCSB damage. 27 Jul Undamaged Dead or lodged Percent dead main stems main stems Total plants or lodged (LCSB) (LCSB) (LCSB) main stems Yield Soybean line Number/80 ft (LCSB) (bu/acre) NC01-11136 186.5e 71.0abc 257.5d 28.0ab 27.1de NC01-11771 255.8c 42.5cde 298.3bc 14.5c 34.2ab NC01-11777 264.5bc 27.8e 292.3bc 9.8c 33.6abc NC01-7432 306.5ab 42.8cde 349.3a 12.2c 32.1a-d NC01-7462 241.8cd 50.3b-e 292.0bc 16.8bc 27.8cde NC01-9646 319.3a 31.3de 350.5a 9.1c 35.2a NC Roy 252.5c 63.5a-d 316.0b 20.3abc 32.2a-d NC Raleigh 198.0de 90.3a 288.3c 31.3a 32.9a-d Haskell 216.5cde 78.5ab 295.0bc 26.7ab 34.1ab Benning 196.5de 85.5a 282.5cd 30.6a 28.9b-e H7242RR 248.0c 50.5b-e 298.5bc 16.8bc 23.6e USG7732nRR 231.5cde 51.0b-e 282.5cd 18.6bc 35.3a LSD (P = 0.05) 48.64 32.28 26.68 11.91 5.34 Means followed by the same letter are not significantly different (P = 0.05; LSD).
Arthropod Management Tests – Oxford University Press
Published: Jan 1, 2010
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