TY  - JA
AU  - Markkula,M.
AU  - Roukka,K.
TI  - Resistance of plants to the pea aphid acyrthosiphon pisum harris (hom., aphididae) I. Fecundity of the biotypes on different host plants
PY  - 1970///
T2  - Annales Agriculturae Fenniae
ER  -