Diseases and pests of cereals

avena sativa bacteria biological properties biologie cereal crops champignon clima climat climate cultivos de cereales diptera enfermedades de las plantas fungi getreide gramineae hongos hordeum vulgare hymenoptera insecta insecte nuisible klima krankheit lepidoptera maladie des plantes mangel nematodos de las plantas pest insects plant diseases plant nematodes plant viruses secale cereale symptom symptome symptoms thysanoptera triticale triticale (gramineae) triticum aestivum virus virus de las plantas wirt