Abstract
The spread of ratoon stunting disease by the mechanical harvester was followed in disease-free sugarcane plants of cultivars susceptible, intermediate, or resistant to the disease. Incidence in a 12-m row of susceptible cultivar L 62-96 preceded by one, two, or four diseased plants was 30, 60, and 75%, respectively, after one harvest and 84, 98, and 99%, respectively, after two harvests. Incidence in intermediate cultivar CP 65-357 was 10, 11, and 9% in the first ratoon and 26, 24, and 44% in the second ratoon. No spread was detected in resistant cultivar L 60-25. Gradients were apparent in consecutive 3-m segments of rows (.)
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