Chemical Control of Alternaria Brown Spot on Mandarins Cultivars in Tunisia

Maali Haddad, N. Benfradj, I. B. Salem, M. Mabrouk, N. B. Hamdi
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Abstract

Three field experiments were conducted to evaluate the efficiency of seven active ingredients (Tryfloxystrobin, Iprodione, Procymidone, Mancozebe, Propinebe, Tebuconazole and Coppersulfate), against Alternaria brown spot (ABS) caused by Alternaria alternata on Minneola, Fortune, Nova and Tangerine mandarins citrus cultivars in Tunisia. Over the three trials, citrus trees received 6, 10 and 16 fungicides sprays. The results of the present investigation demonstrated the prevention ability of Mancozebe, Iprodione and Copper sulfate according to disease incidence, fruit infection and losses caused by ABS. Furthermore, the applications of those three fungicides used in mixture reduce the ABS development. In fact, disease incidence was reduced better after an application of a mixture of Mancozebe and Iprodione compared to application of Mancozebe or Iprodione alone and after an application of an alternation of Mancozebe and Iprodione with copper sulfate. From this study, it revealed that the incidence of ABS, an emerging fungi disease on Citrus in Tunisia, could be reduced by using chemical products. Contribution/Originality: This study documents the evaluation of the efficiency of seven active ingredients against citrus Alternaria brown spot caused by Alternaria alternata on Minneola, Fortune, Nova and Tangerine mandarin cultivars in Tunisia.
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突尼斯柑桔品种褐斑病的化学防治
采用田间试验研究了7种有效成分(Tryfloxystrobin、Iprodione、Procymidone、Mancozebe、Propinebe、Tebuconazole和Coppersulfate)对突尼斯品种明尼奥拉(Minneola)、福琼(Fortune)、诺瓦(Nova)和蜜橘(Tangerine)的防治效果。在三次试验中,柑橘树分别喷洒了6次、10次和16次杀菌剂。结果表明,代森锰酸盐、异丙二酮和硫酸铜对青枯病发病率、果实侵染率和损失均有一定的预防作用,且三种杀菌剂混用可减少青枯病的发生。事实上,与单独使用代森锰酸盐或异丙二酮以及代森锰酸盐和异丙二酮与硫酸铜交替使用相比,使用代森锰酸盐和异丙二酮的混合物后,疾病发病率降低得更好。本研究表明,利用化学制剂可以降低突尼斯柑橘发生的一种新型真菌病ABS的发病率。贡献/原创:本研究评价了7种有效成分对突尼斯的明尼奥拉、福琼、诺瓦和陈橘柑桔品种互花霉病的防治效果。
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