PROJECT REPORT No. 285 EFFECTS OF ... - HGCA

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Table 8. Effects of fungicides, applied at rates equivalent to 250 or 500 g ai/ha (on an area basis), onincidence and severity of take-all on seedlings of wheat grown in naturally-infested soil inExperiment 2.1 1% plants with take-all % roots with take-allFungicide 250 500 Mean 250 500 MeanNone +1.42 (94.4) +1.42 (94.4) +0.09 (54.7) +0.09 (54.7)Azoxystrobin +1.10 (90.0) +1.32 (93.3) +1.21 (91.8) -0.28 (36.5) -0.36 (32.6) -0.32 (34.5)Kresoxim-methyl +1.39 (94.1) - - +0.16 (57.9) - -Picoxystrobin +1.41 (94.3) +1.41 (94.3) +1.41 (94.3) +0.25 (62.3) +0.24 (61.7) +0.25 (62.0)Pyraclostrobin +1.41 (94.3) +1.41 (94.3) +1.41 (94.3) +0.21 (60.2) -0.04 (47.9) +0.08 (54.0)Trifloxystrobin +1.41 (94.3) +1.32 (93.3) +1.36 (93.8) +0.18 (59.0) +0.14 (56.8) +0.16 (57.9)HGCA Z +1.42 (94.4) +1.12 (90.3) +1.27 (92.6) -0.16 (42.0) -0.55 (24.9) -0.36 (32.9)SED 2 (61DF) 1 0.112 0.079 0.119 0.0842 0.097 0.079 0.103 0.084Probability 3 0.04 0.05 0.14
effect of the two fungicides was to decrease significantly the number of roots (7.7 vs 8.0) but they only didso in pots subjected to the top-watering regime (7.5 vs 8.3 roots/plant) and HGCA Z did not do so in theWoburn soil. Because of these differences in total numbers of roots, Table 9 shows percentages of rootswith take-all rather than numbers.Table 9. Effects of azoxystrobin and HGCA Z, applied at rates equivalent to 250 or 500 g ai/ha (on anarea basis), on incidence and severity of take-all on seedlings of wheat grown in naturally-infested soilin Experiment 2.2 1 .% plants with take-all % roots with take-allFungicide 250 500 Mean 250 500 MeanAfter 4 weeksNone +0.83(84.0) +0.83(84.0) -0.90(14.3) -0.90(14.3)Azoxystrobin +0.41(69.4) +0.62(77.7) +0.52(73.8) -1.34(6.4) -1.02(11.4) -1.18(8.6)HGCA Z +0.99(87.9) +0.83(84.1) +0.91(86.1) -0.63(22.0) -0.88(14.7) -0.76(18.0)SED 2 (50 DF) 120.2000.1740.1420.1420.1280.1100.0900.090Probability 3 0.19 0.008 0.003
Page 2 and 3: PROJECT REPORT No. 285EFFECTS OF AZ
Page 4 and 5: ABSTRACTSeverity of take-all (Gaeum
Page 6 and 7: early sprays were of azoxystrobin (
Page 8 and 9: viewed with some caution until it h
Page 10 and 11: at risk from the disease and, if co
Page 12 and 13: neither (Table 1). Dates (and growt
Page 14 and 15: dates to the foliage in plots sown
Page 16 and 17: Table 3. Effects of azoxystrobin an
Page 18 and 19: Table 5. Effects of azoxystrobin an
Page 20 and 21: significant effect. Results from th
Page 22 and 23: Total numbers of plants and roots (
Page 26 and 27: These effects were apparently modif
Page 28 and 29: DISCUSSIONThe results from the fiel
Page 30 and 31: effects that strobilurin fungicides
Page 32 and 33: Table 12 (Experiment 1 of Jenkyn et
Page 34 and 35: REFERENCESBateman, G.L. (1989). Pro

PROJECT REPORT No. 285 EFFECTS OF ... - HGCA

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