Kharakteristika razvitija najjbolee vazhnykh boleznejj i vreditelejj kartofelja i svjokly v 1968 godu i prognoz ikh pojavlenija i vredonosnosti v 1969 godu
EN
Characteristic of development of the most importany diseases and pests of potatoes and sugar beets in Poland in 1968 and forecast of their appearance and noxiousness in 1969