Severidad de la roya naranja en cultivares de caña de azúcar infectados en la provincia de Villa Clara
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Abstract
The objective of the present study was to evaluate the infection and severity of the sugarcane orange rust [Puccinia kuehnii (Krüger) Butler], in a group of commercial cultivars, by means of the calculation of epidemic variables. The experiment was developed at the Sugarcane Territorial Station in Villa Clara province. 25 commercial cultivars were evaluated, among them to B7274, C89-147 and C95-414 as susceptible controls, 11 progenitors infected naturally by P. kuehnii since 2009. Besides cultivars Q124 and CP72-2086, susceptible in Australia and Central America respectively were also included as control. Affected foliar area (AFA), area under the disease progress curve (ABCPE) and rate of progression of the disease (r) were calculated. 18 cultivars were infected; six of them were commercial cultivars. The highest disease severity was observed on the progenitors CSR81-86, CSG398-92 and B52107. With the exception of C89-147, all the controls were infected and the smallest severity was registered on CP72-2086 and Q124. During the evaluation period an epidemic was not occurred. The infection was extended from november to july with a maximum in january, to the seven months of age of the plants.
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