ontario sugar beet growers - Atrium - University of Guelph

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CROP: PEST: Sugar beet (Beta vulgaris L.) cv. El7 Rhizoctonia Crown Rot, Rhizoctonia solani Kuhn Cercospora leafspot, Cercospora beticola, Sacc. NAME AND AGENCY: PITBLADO, R E Ridgetown College; University of Guelph, Ridgetown, Ontario, NOP 2C0 Tel: (5 19) 674-1 605 Fax: (5 19) 674-1600 E-mail: mitblad@,ridgetownc.uoguelph.ca TITLE: CONTROL OF RHIZOCTONIA CROWN ROT IN SUGARBEETS- NON- ARTIFICIALLY INOCULATED PLOT- 2005 MATERIALS: HEADLINE 250EC (pyraclostrobin), QUADRIS 250SC (azoxystrobin). METHODS: Sugarbeets were planted at the research station in Ridgetown, on May 6,2005. Plots were two rows, 7 m in length spaced 0.75 cm apart, replicated four times in a randomized complete block design. The location chosen had not had sugarbeets grown on it for at least two years (cabbage was grown for the 2 years prior to this tial) and the plot was not artificially infected with Rhizoctonia inoculum. The in-furrow spray applications were directed over the seed and then covered on May 7 using a specialized small plot research CO, sprayer with a single nozzled hand-held boom applying 200Lha of spray mixture. The at emergence sprays were applied over the planted row in a 15 cm band on May 26 and at the 4-leaf stage on June 9. Assessments were conducted by giving a plant vigour rating on July 15 and counting the number of dead plants cause by infection by Rhizoctonia crown rot. In addition the plots were rated for the number of infection sites caused by Cercospora Leafspot disease on September 12. Results were analysed using the Duncan's multiple range test (PI 0.05). RESULTS: Data are presented in Table 1. CONCLUSIONS: The vigour ratings improved for the non in-furrow treated plots in this trial where the plots did not have any additional Rhizoctonia crown rot disease inoculum to deal with compared to Trial 2 which contained a similar treatment list but had been artificially inoculated. The question was then was whether or not the lack of vigour and seedling emergence in that tial was due to the method of applying the chemicals as an in-furrow treatment. It appears that in this trial the technique of applying the infurrow treatments did not give any advantage to emergence or plant vigour and thus one should conclude that in tial2 the benefits shown in the in-furrow treatments was due to its ability to control Rhizoctonia crown rot infections at this early stage. In this tial there was very little disease pressure with few plants dying as a result of infections by Rhizoctonia. It should also be noted that the treatments for the control of Rhizoctonia crown rot did not persist long enough to affect the leafspot disease caused by Cercospora.
Table 1. Effect of fungicides applied at different timings for the control of Rhizoctonia crown rot in sugarbeets. Treatments # Infection Plant Final sites caused Vigour Plant Rate Ratings Counts by Application Product (0- 10) l1 Cercospora Leafspot Julv 15 Julv 28 Se~t. 12 QUADRIS 250SC 4 m11100 m of row In Furrow 8.3 a-d* QUADRIS 250SC 5 mV100 m of row In Furrow 7.0 de QUADRIS 250SC 6 mV100 m of row In Furrow 7.8 cde HEADLINE 250EC 5 mV100 mofrow In Furrow 8.3 a-d HEADLINE 250EC 7 mV100 m of row In Furrow 7.3 de HEADLINE 250EC 9 mVl 00 m of row In Furrow 6.7 e QUADRIS 250SC 0.5 L/ha Emergence 7.2 de QUADRIS 250SC 1.1 L/ha Emergence 7.8 cde HEADLINE 250EC 0.5 L/ha Emergence 9.4 a HEADLINE 250EC 1.1 L/ha Emergence 9.3 ab HEADLINE 250EC 1.6 L/ha Emergence 7.3 de QUADRIS 250SC 0.5 L/ha 4-Leaf 7.8 cde QUADRIS 250SC 1.1 L/ha 4-Leaf 9.0 abc HEADLINE 250EC 1.1 /ha 4-Leaf 8.9 abc HEADLINE 250EC 1.6 L/ha 4-Leaf 8.0 b-e Control 8.8 abc ANOVA P50.05 s s ns I Coefficient of Variation (%) 11.9 800.0 *These values are the means of four replications. Numbers within a column followed by the same small letter are not significantly different according to a Duncan's Multiple Range Test (P50.05). 'I Plant Vigour Ratings (0-10); 0- plants in poor health, 10- plants are very vigorous and growing well. I
Page 1 and 2: Submitted to the ONTARIO SUGAR BEET
Page 3 and 4: SPECIAL ACKNOWLDEGMENTS I wish to p
Page 5 and 6: REPORTS IRRIGATION STRATEGIES FOR S
Page 7 and 8: Research Results and Milestone Stat
Page 9 and 10: applications, severely costing the
Page 11 and 12: Table 1. Foliar disease control rat
Page 13 and 14: CROP: Sugar beet (Beta vulgaris L.)
Page 15 and 16: Table la. Cercospora Foliar disease
Page 17: BeetCast Evaluation for the Control
Page 23 and 24: CROP: PEST: Sugar beet (Beta vulgar
Page 25: CONTROL OF RHlZOCTONlA CROWN ROT IN
Page 29 and 30: Table 1. Foliar insect damage ratin
Page 33 and 34: effective in combating the crown ro
Page 35 and 36: Table 1. Field assessments of sugar
Page 37 and 38: Table 1. Common leaf rust ratings i
Page 39 and 40: IRRIGATION STRATEGIES FOR SUGAR BEE
Page 41 and 42: Fig. 1. Irrigation test sites, Mich
Page 43: Fig. 5. Commercial Pivot Irrigation
Page 50 and 51: Irr 1-7: dates where grower applied
Page 52 and 53: Fig. 8b. Location A Pivot Irrigatio
Page 54 and 55: COMMENTS: Location A CONTROL lOcm T
Page 56 and 57: Fig. 9a Location B Control 10cm Dep
Page 58 and 59: 1Ocm Depth Hand lrrigated (Reif) -
Page 60 and 61: SUGAR BEET MELD AND SUGAR CONTENT O
Page 62 and 63: COMMENTS The reference ETo at each
Page 64 and 65: graphs indicated that too much wate
Page 66 and 67: 1. PRODUCTION BENEFITS OF IRRIGATIO
Page 68 and 69: of 10 (Fig. 6). Plant growth charac
Page 70 and 71: Table 1: Seed corn irrigation analy
Page 72 and 73: Fig. 8. Irrigation plot layout show
Page 74 and 75: Cob Length Irrigation significantly
Page 76 and 77:
Seed Corn Yields Irrigation signifi
Page 78 and 79:
BENEFITS OF IRRIGATING SEED CORN IN
Page 80 and 81:
C-probe Scaled Frequency Unit V I +
Page 82 and 83:
CONCLUSIONS: The initial intent was
Page 84 and 85:
Fig. >rip tape along side of seed c
Page 86 and 87:
Table 8b: Drip Irrigation - Seed co
Page 88 and 89:
Fig. 18. Drip Irrigation - Non-irri
Page 90 and 91:
Fig. 20. Rainfall accumulations in
Page 92 and 93:
Fig. 22. Soil moisture profile in f
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ontario sugar beet growers - Atrium - University of Guelph

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