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Incompatibility of Cleopatra mandarin rootstock for grafting citrus in Central Amazon, State of Amazonas, Brazil

2011; Volume: 54; Issue: 3 Linguagem: Inglês

10.4322/rca.2012.026

2177-8760

Larissa Alexandra Cardoso Moraes, Adônis Moreira, José Clério Rezende Pereira,

Plant Disease Management Techniques

In sweet orange 'Pêra-Rio' and acid lime 'Tahiti' citrus plants (Citrus spp.) stalked on "Cleopatra" mandarin, a necrosis in the grafting point was observed, causing plant death and dry fruits.Aiming to identify the causes of changes in the rootstock, which lead to grafting incompatibility, an anatomical study comparing plants with and without symptoms, stalked on Rangpur lime, was performed.In addition, the plant nutritional conditions and soil fertility of orchards were evaluated.Necrotic processes caused by vascular discontinuity between the crown and the rootstock were the main causes of loss in productivity and fruit quality.The incompatibility between the rootstock with the crown of 'Pêra-Rio' orange or 'Tahiti' lime causes plant nutritional imbalance that is not related to low natural fertility of the soil in the region.The results indicated problems in the use of 'Cleopatra' mandarin rootstock with the soil and climatic conditions of the Central Amazon region.