Studies on wilt of cotton, powdery mildews and diseases of fruit trees and ornamentals [Sudan]

arbre ornemental aubergine aubergines berenjena chemical control citrus concombre cucumbers dieback disease resistance enfermedades de las plantas fusarium gossypium lutte chimique maladie des plantes marchitez marchitez descendente mildews mildiou oidium ornamental trees pepino plant diseases resistencia a la enfermedad soudan sudan tomate tomatoes wilts