Soybean Agronomy and Host Plant Resistance Beaumont, TX 2009
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1 Beaumont, TX 2009 North I II III IV V 1 HBK C S49 W6 RR HBK C HBK RR HBK C S49 W6 RR HBK C HBK RR Vernal 12 HBK RR HBK C Vernal 17 HBK RR HBK C S49 W6 RR 22 HBK RR HBK C HBK RR S49 W6 RR 27 HBK RR HBK C HBK RR Vernal 33 HBK C HBK RR Vernal 38 HBK C HBK RR HBK C HBK C Vernal 44 S49 W6 RR 45 HBK RR HBK C HBK C Vernal 49 S49 W6 RR 50 HBK RR HBK C HBK RR Vernal 55 HBK C HBK C HBK RR Vernal 60 HBK C HBK RR HBK RR S49 W6 RR 66 HBK RR HBK RR S49 W6 RR 71 HBK RR S49 W6 RR 74 HBK C Vernal 76 HBK RR S49 W6 RR 79 HBK C Vernal Treated Untreated Plot size = 4 rows, 30 inch row spacing, 32 ft long, 5 ft alley 92
2 Agronomic and Cultural Information Experimental design: Split-plot with main plots variety and sub plots treated or untreated for stink bugs Planting: Pulled beds in Morey silt loam soil (30 inch row width) on Feb 27. Planted test on Mar 21 (8 entries, treated and untreated, with 5 replications), general emergence on Mar 27 Plot size: Herbicide: 4 rows, 30 inch row width, trimmed to 32 ft after emergence First 0.75 oz/a and Dual II 2.5 pts/a applied with 3-nozzle spray boom (110-04S nozzles, 29 gpa) Cultivation: Cultivated pre-plant on Mar 21 Cultivation on May 18 Treatments: Orthene 1 lb ai/a applied with a 2-person hand-held spray boom (13, No. 2 cone nozzles, 50 mesh screens 18 gpa) to treated plots on Jun 3, Jun 16, Jul 13, Jul 30 and Sep 14; treated plots were sprayed a total of 5 times Sampling: Harvest: Inspected plots for flowering: no plots more mature than R1 on May 14. All plots short and no stink bugs observed in any plots. Pretreatment sweeps (15 sweeps per variety per rep) and stage of growth for each variety per rep on Jun 1 Stage of growth of each plot in rep 1 and 15 sweeps in each plot on Jun 8, Jun 19, Jul 15, Aug 3 and Sep 16 Plots not harvested due to poor seed yield and quality caused by abnormally high rainfall during and after podfill. Data analysis: Insect counts transformed using means separated by LSD. x ; all data analyzed by ANOVA and Discussion In general, stink bug populations were low throughout the experiment (Tables 1-14). Current treatment thresholds for stink bugs are about 5 per 15 sweeps. Populations never reached this density in untreated plots on any sampling date. As noted above, plots were not harvested due to abnormally high rainfall during and after podfill. Data suggest planting soybeans in March in SE Texas (east of Houston) is not a viable practice. 93
3 Table 1. Total (nymphs + adults) stink bugs (redbanded, southern green and brown) per 15 sweeps in soybean host plant resistance. Beaumont, TX Variety Trt a PRE b Jun 8 Jun 19 Jul 15 Aug 3 Sep T U T U HBK C5025 T U HBK C5941 T U HBK RR5123 T U HBK RR5425 T U S49 W6 RR T U Vernal T U b PRE = pretreatment sweeps Table 2. Statistical analysis of data in Table 1. PRE a Jun 8 Jun 19 Jul 15 Aug 3 Sep HBK C HBK C HBK RR HBK RR S49 W6 RR Vernal Treated b 1.4 a 0.4 b Untreated 0 b 1.0 a P = a PRE = pretreatment sweeps Means in a column followed by the same or no letter are not significantly different (P = 0.05, ANOVA and LSD) 94
4 Table 3. Mean stink bug data (number per 15 sweeps) on Jun 1 (pretreatment) for soybean host plant resistance. Beaumont, TX T T HBK C5025 T HBK C5941 T HBK RR5123 T HBK RR5425 T S49 W6 RR T Vernal T Table 4. Statistical analysis of data from Table 3. Beaumont, TX HBK C HBK C HBK RR HBK RR S49 W6 RR Vernal Treated b 0.9 a a a a Untreated 0 b 0 0 b b 0 0 b P = Means in a column followed by the same or no letter are not significantly different (P = 0.05, ANOVA and LSD) 95
5 Table 5. Mean stink bug data (number per 15 sweeps) on Jun 8 for soybean host plant resistance. Beaumont, TX T U T U HBK C5025 T U HBK C5941 T U HBK RR5123 T U HBK RR5425 T U S49 W6 RR T U Vernal T U Table 6. Statistical analysis of data from Table 5. Beaumont, TX HBK C HBK C HBK RR HBK RR S49 W6 RR Vernal Treated b 0.2 b b Untreated 0.6 a a P = Means in a column followed by the same or no letter are not significantly different (P = 0.05, ANOVA and LSD) 96
6 Table 7. Mean stink bug data (number per 15 sweeps) on Jun 19 for soybean host plant resistance. Beaumont, TX T U T U HBK C5025 T U HBK C5941 T U HBK RR5123 T U HBK RR5425 T U S49 W6 RR T U Vernal T U Table 8. Statistical analysis of data from Table 7. Beaumont, TX ab b b b HBK C a b HBK C ab b HBK RR b b HBK RR a b S49 W6 RR a a Vernal b b Treated b Untreated P = Means in a column followed by the same or no letter are not significantly different (P = 0.05, ANOVA and LSD) 97
7 Table 9. Mean stink bug data (number per 15 sweeps) on Jul 15 for soybean host plant resistance. Beaumont, TX T U T U HBK C5025 T U HBK C5941 T U HBK RR5123 T U HBK RR5425 T U S49 W6 RR T U Vernal T U Table 10. Statistical analysis of data from Table 9. Beaumont, TX HBK C HBK C HBK RR HBK RR S49 W6 RR Vernal Treated b Untreated P = Means in a column followed by the same or no letter are not significantly different (P = 0.05, ANOVA and LSD) 98
8 Table 11. Mean stink bug data (number per 15 sweeps) on Aug 3 for soybean host plant resistance. Beaumont, TX T U T U HBK C5025 T U HBK C5941 T U HBK RR5123 T U HBK RR5425 T U S49 W6 RR T U Vernal T U Table 12. Statistical analysis of data from Table 11. Beaumont, TX HBK C HBK C HBK RR HBK RR S49 W6 RR Vernal Treated b Untreated P = Means in a column followed by the same or no letter are not significantly different (P = 0.05, ANOVA and LSD) 99
9 Table 13. Mean stink bug data (number per 15 sweeps) on Sep 16 for soybean host plant resistance. Beaumont, TX T U T U HBK C5025 T U HBK C5941 T U HBK RR5123 T U HBK RR5425 T U S49 W6 RR T U Vernal T U Table 14. Statistical analysis of data from Table 13. Beaumont, TX b 0.6 b b 0.5 b HBK C b 0.2 b HBK C a 1.5 a HBK RR b 0.3 b HBK RR b 0.7 b S49 W6 RR b 0.1 b Vernal b 0.5 b Treated b Untreated P = Means in a column followed by the same or no letter are not significantly different (P = 0.05, ANOVA and LSD) 100
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