Quemical control of citrus canker in young plants managed in conventional and organic systems

Ciência Rural

Oliveira, Regina Beatriz Loss de¹  Panzenhagen, Nestor Valtir¹  Koller, Otto Carlos¹  Dal Soglio, Fábio¹  Manteze, Francisco²  Nunes, Diego Soares¹  Sartori, Ivar Antônio¹ 

[1] Universidade Federal do Rio Grande do Sul, Porto Alegre, Brasil;Emater, Montenegro, Brasil

关键词: citrus canker;    organic management;    conventional management;    rootstock;    Xanthomonas citri pv;   

DOI  :  10.1590/S0103-84782006000400001

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

The objective of the present work was to evaluate the development of the citrus rootstock Poncirus trifoliata, severity of citrus canker, caused by Xanthomonas citri pv. citri and the control of this disease with copper sprays, in conventional and organic management systems, at the Centro de Formação da EMATER, located in Montenegro, Rio Grande do Sul. Plants were artificially inoculated with the bacteria. To control citrus canker, different sources of copper as well as concentrations and number of sprays were tested. In the organic system the bordeaux mixture was applied while in the conventional system copper oxichloride was sprayed. Plants trunk diameter, dry matter of the rootstocks and number of canker lesions on leaves and branches were evaluated in both systems. Citrus canker incidence on the rootstocks was equally intense, and the seedlings development was similar in both systems, but the budded plants grew better at the conventional system. Copper treatments were not effective in controlling citrus canker at the rootstocks due the high inoculum concentration. On the budded plants, with low inoculum concentration, both the Bordeaux mixture and the copper oxichloride controlled the disease, and the better treatments were when 0.3% metallic copper was applied with interval of 14 days. To improve citrus canker control by Bordeaux mixture on organic systems, there is a need of efficient control strategies of the citrus leaf miner.

【 授权许可】

CC BY-NC