Haku
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Resistance of plants to the pea aphid Acyrthosiphon pisum Harris (Hom., Aphididae) : II. Fecundity on different red clover varieties
(Agricultural Research centreMaatalouden tutkimuskeskus, 1970)
Pests of cultivated plants in Finland in 1969
(Agricultural Research centreMaatalouden tutkimuskeskus, 1970)