Basic elements of plant protection in May [in the Czech Republic]

aphis nasturtii beta vulgaris cereal crops cultivos de cereales cydia pomonella enfermedades fungosas erysiphe graminis fruit crops frutales fungal diseases gnomonia hoplocampa leptinotarsa decemlineata maladie fongique mycosphaerella graminicola myzus persicae panonychus ulmi pesticide pesticides pests of plants plagas de plantas plaguicidas puccinia recondita pyrenophora teres ravageur des plantes solanum tuberosum virose viroses virosis