Species composition of ladybirds (Col., Coccinellidae) on hazelnut plantations
Magdalena Gantner, Bożenna Ja¶kiewicz
Department of Entomology
Króla Leszczyńskiego 7, 20-069 Lublin, Poland
During the years 1994-1996 studies on species composition and the number
of Coccinellidae were carried out on an intensively protected hazel
plantation and on an unprotected one. On both localities, 14 species of
ladybirds were found, the most numerous being Propylea
quatuordecimpunctata (L.) and Coccinella septempunctata L.
Throughout the vegetative season, coccinellids occurred in 2 or 3 peaks in
number, while at the same time the maximum number of aphids feeding on
hazel leaves occurred once. Ladybirds, especially Propylea
quatuordecimpunctata (L.) and Coccinella septempunctata L.,
play a significant role in controlling the number of hazel aphids in early
spring. If the population of these pests is low, it does not seem
justified to use insecticides. On the other hand, in the years that favour
the growth of aphids, the threshold of harm may be surpassed and chemical
treatments must be applied.
Gantner M., Ja¶kiewicz B., 2001. Species composition of ladybirds (Col., Coccinellidae)
on hazelnut plantations. Folia Horticulturae 13/1: 91-100.