|
| Synergistic Toxicity and Field Control Efficacy of Tebuconazole and Fludioxonil against Neoscytalidium dimidiatum on Pitaya |
| |
| DOI：10.16768/j.issn.1004-874X.2020.05.010 |
|
| Hits: 1622 |
| Download times: 637 |
| Abstract: |
| 【Objective】The study was to clarify the synergistic toxicity and field control efficacy of tebuconazole and fludioxonil against Neoscytalidium dimidiatum on pitaya.【Method】The mycelial growth rate method was used to determine the in vitro toxicity efficacy of tebuconazole, fludioxonil and their compound fungicide on N. dimidiatum. The synergistic effect of the compound fungicide was evaluated by Wadley method. The field experiment of the compound was carried out to verify its control effect on pitaya brown rot disease.【Result】 Fludioxonil and tebuconazole showed good inhibitory effect against N. dimidiatum on pitaya, and the EC50 values were 0.0045 and 0.0671 mg/L, respectively. The compound of tebuconazole and fludioxonil exhibited an additive effect on N. dimidiatum. After 7 days of the last spraying with the active ingredient concentrations of 100 mg/kg and 500 mg/kg on pitaya plants for three times, the average control effects of tebuconazole and fludioxonil with the mass ratio of 8 ∶ 2 were 80.31% and 89.44%, respectively. And the average control effect of single tebuconazole was 80.24% and 89.71%, while the average control effect of single fludioxonil was 70.08% and 76.29%, respectively. After 15 days of the last spraying, the average control effect of tebuconazole and fludioxonil with the mass ratio of 8 ∶ 2 was 76.80% and 83.63%, respectively. And the average control effect of single tebuconazole was 74.63% and 81.22%, while that of single fludioxonil was 54.53% and 65.24%, respectively. The control effect of two active ingredient concentrations of tebuconazole and fludioxonil compound was higher than that of single fungicide.【Conclusion】The compound of tebuconazole and fludioxonil with the mass ratio of 8 ∶ 2 showed good inhibitory effect to N. dimidiatum on pitaya, and exhibited good control efficacy in the field, with non-toxicity to pitaya. Therefore, the compound fungicide with the mass ratio of 8 ∶ 2 could be promoted in pitaya production. |
|
View Full Text
View/Add Comment Download reader |
|
|
|
