Environmental influence on the incidence of shoot diseases and health of Amaranthus seeds in humid tropics: Nigeria

amaranthus cruentus choanephora choanephora cucurbitarum developing countries dieback enfermedades fungosas environmental factors facteur du milieu factores ambientales fungal diseases harvesting date hortalizas (plantas) humid tropics maladie fongique marchitez descendente nigeria organisme transmissible par semence organismos transmitidos por semilla seed semence semillas tropiques humides variedades varieties vegetable crops