| influence of climatic conditions on white tip disease (phytophthora porri) in leek (allium porrum). | in leek, one of the major vegetable crops in belgium, phytophthora porri causes the so-called white tip disease. during the growing seasons of 1999, 2000 and 2001 the incidence of the white tip disease and the role of environmental conditions in the appearance were investigated on several non-treated leek fields in flanders (belgium). the first symptoms of white tip disease on leek where recorded in july and the disease progressed until march. lesions appeared after an incubation period of 91 to ... | 2002 | 12701432 |