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SMC

0.2 TPTH. 80. 1.0 TPTH. 70. 60. 50. percent spots tolerant to TPTH. 40. 30. 20. 10. 0. HBO. EGF. CRK. SMC. DRA. MHD. Mn-Dk. Figure 1. Tolerance to triphenyltin hydroxide in C. beticola obtained from sugarbeet fields in Minnesota and North Dakota in 2000. 5.0 TM. 60. 50.

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SMC

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  1. 0.2 TPTH 80 1.0 TPTH 70 60 50 percent spots tolerant to TPTH 40 30 20 10 0 HBO EGF CRK SMC DRA MHD Mn-Dk Figure 1. Tolerance to triphenyltin hydroxide in C. beticola obtained from sugarbeet fields in Minnesota and North Dakota in 2000.

  2. 5.0 TM 60 50 40 percent spots resistant to TM 30 20 10 0 HBO EGF CRK SMC DRA MHD Mn-Dk Figure 2. Resistance to thiophanate methyl in C. beticola obtained from sugarbeet fields in Minnesota and North Dakota in 2000.

  3. 100 tetraconazole-amended PDA 90 1 ppm 80 2 ppm 70 3 ppm 60 4 ppm percent inhibition of radial growth 50 40 30 20 10 0 1479-5 1451-2 1481-5 1454-5 C. beticola isolate Figure 3. Tolerance to tetraconazole in C. beticola obtained from sugarbeet fields in Minnesota and North Dakota.

  4. 60 50 40 0.2 TPTH percent spots tolerant to fungicide 30 1.0 TPTH 5.0 TM 20 10 0 8-11-00 8-31-00 9-21-00 1 2 3 Sampling Date Figure 4. Tolerance to TPTH and TM in C. beticola obtained from sugarbeet fields in Minnesota and North Dakota as a function of sampling date.

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