Current Status of Verticillium Wilt of Cotton in Southern Spain: Pathogen Variation and Population in Soil
Aproximately 80% of the total national acreage of cotton (Gossypium hirsutum L.) is grown under irrigation in the Guadalquivir Valley of Andalucia, southern Spain. In this region, cotton has usually been grown in rotation with crops such as corn, sunflower, sugar beet and Wheat. However, high yields and income obtained by farmers with cotton crops as compared to other crops, have led to shorten rotations and intensified cotton cultivation. This trend has been associated with increased attacks by pests and diseases, of which Verticillium wilt (VW) induced by Verticillium dahliae Kleb, is the most important. Recently, VW epidemics have become highly severe in the lower Guadalquivir Valley (Marismas) as a result of high inoculum densities (ID) in the soil and/or the existence of a defoliation-inducing pathotype. These severe epidemics are limiting the use of cotton as a crop in many fields at Marismas.
KeywordsDisease Incidence Verticillium Wilt Inoculum Density Cotton Cultivar Verticillium Dahliae
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