Hybrid Poplar Clones with Populus maximowiczii Parentage Demonstrate Postoviposition Antibiosis to Cryptorhynchus lapathi (Coleoptera: Curculionidae)

Lanham

2005

S. 2254-2259

SonderdruckBandaufführung

189743

Damage caused by the poplar-and-willow borer, Cryptorhynchus lapathi (L.) (Coleoptera: Curculionidae), is reported to vary among hybrid poplar clones. We evaluated oviposition preferences and larval success in four hybrid poplars on potted and Þeld-planted trees. Oviposition occurred somewhat less frequently and abundantly on two clones with Populus maximowiczii Henry parentage in Þeld-planted and potted trees, and signiÞcantly fewer larvae survived to adulthood on those clones. No adults emerged from Þeld-planted NM 6 (Populus nigra L. P. maximowiczii) and four emerged from TM 256-28 (Populus trichocarpa Torrey & Gray P. maximowiczii) on which male-female pairs of C. lapathi had been caged. In contrast, 50 and 140 adults emerged over the same 2-yr period from two susceptible clones (n 20), TD 52-226 (P. trichocarpa Populus deltoides Bartram ex Marshall) andTN302-9 (P. trichocarpa P. nigra), respectively. Thus, resistance expressed by clones with P. maximowiczii parentage partially involves decreased levels of oviposition, but more signiÞcantly, antibiosis in resistant clones prevents the development of larvae, probably in early spring.
hybrid poplar, Cryptorhynchus lapathi, resistance, antibiosis, Populus maximowiczii