Haku
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Control of Rhopalosiphum padi (L.) (Hom., Aphididae) with Coccinella septempunctata L. (Col., Coccinellidae) in cages, and effect of late aphid infestation on barley yield
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1975)
The importance of Coccinella septempunctata L. (Col., Coccinellidae) in controlling cereal aphids, and the effect of aphids on the yield and quality of barley
(Agricultural Research CentreMaatalouden tutkimuskeskus, 1972)