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Volume :28 Issue : 1 2001      Add To Cart                                                                    Download

Incidence and severity of black scorch on date palms in Kuwait

Auther : PATR1CE SULEMAN , AZZA AL-MUSALLAM AND CYNTHIA A. MENEZES

Department of Biological Sciences, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait, e -mail: suleman@kuc01.edu.kw

ABSTRACT

The causal agent of black scorch in date palms in nurseries, landscapes and a few plantations in Kuwait was found to be Thielaviopsis paradoxa and Ceratocystis radicicola. This is the first report of the occurrence of the disease in Kuwait. Both pathogens were isolated from all tissues of diseased trees with C. radicicola being more virulent and frequently found on diseased roots. The optimum growth temperature was 25 and 35 ؛C for T. paradoxa and C. radicicola, respectively. Optimum pH for growth of both pathogens was in the 5.0-6.0 range. Poor cultural practices, particularly drought stress, had the greatest impact on trees. Seedling infections on 4 5-leaf date palms in both the greenhouse and growth chambers produced cankers, tissue necrosis, wilting, death of buds, and plant mortality. Despite the common occurrence of visible cankers in field-infected palm trees, mortality of few plants was by death of the terminal bud. Histologically, damage was restricted to the parenchyma tissue. Five cultivars from tissue cultures were screened for genetic variability in the greenhouse, and Nabut-saif. Berhi and Kadrawi cultivars were found to be the most susceptible.

 

Keywords: Ceratocystis paradoxa, Ceratocystis radicicola. Phoenix dactylifera

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