Centre for Horticultural Science, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, Brisbane, Queensland 4001, Australia.
Plant Dis. 2022 Aug;106(8):2026-2030. doi: 10.1094/PDIS-02-22-0264-RE. Epub 2022 Jul 7.
Four common fungicidal products were evaluated for their effect on symptoms caused by two nectriaceous black root rot fungi, and , when applied as pot drenches to avocado () seedlings in the greenhouse. Applications of fludioxonil, thiophanate-methyl + etridiazole, prochloraz, and prochloraz MnCl at 2 and 4 weeks after inoculation with significantly reduced root necrosis and improved root and aboveground plant biomass compared with water-treated controls. Fludioxonil reduced necrosis by 60% and had a significantly lower frequency of reisolation of than the other three fungicide treatments. inoculation caused less severe symptoms in seedlings than despite the longer duration of the trial. Pot drenches with fludioxonil, thiophanate-methyl + etridiazole, and prochloraz MnCl, but not prochloraz alone, significantly reduced root necrosis caused by . Prochloraz MnCl was the only fungicide treatment to increase root and plant biomass compared with water-treated controls. Both fludioxonil and prochloraz MnCl reduced the frequency of reisolation of from necrotic roots by about 50% compared with the other fungicides or water controls. The results indicated that drenches with these fungicides may suppress existing low to moderate black root rot infection, allowing new root growth and improved establishment in the orchard. Fungicide drenching must not replace best-practice disease management strategies in nurseries but may be a useful tool in crisis situations.
四种常见的杀真菌剂产品被评估了其对两种蜜环菌黑根腐病真菌引起的症状的影响，当作为盆栽淋溶液应用于温室中的鳄梨树（）幼苗时。在接种 2 周和 4 周后，用氟环唑、噻菌灵+乙霉威、丙环唑和丙环唑 MnCl 进行处理，与水对照相比，明显减少了根坏死，并改善了根和地上植物生物量。氟环唑将坏死减少了 60%，与其他三种杀菌剂处理相比，再次分离 的频率明显较低。尽管试验时间较长，但 接种引起的症状比 接种引起的症状要轻。用氟环唑、噻菌灵+乙霉威和丙环唑 MnCl 进行盆栽淋溶处理，但单独用丙环唑处理，可显著减少 引起的根坏死。与水对照相比，只有丙环唑 MnCl 处理可增加根和植物生物量。与其他杀菌剂或水对照相比，氟环唑和丙环唑 MnCl 都将再次从坏死根中分离出 的频率降低了约 50%。结果表明，这些杀菌剂的淋溶处理可能会抑制现有的低至中度黑根腐病感染，从而促进新根的生长和在果园中的良好建立。杀菌剂淋溶处理不能替代苗圃中最佳的疾病管理策略，但在危机情况下可能是一种有用的工具。
