[en] After its recent introduction to Chile, the aphid Chaitophorus leucomelas Koch is
becoming a serious pest affecting commercial poplar, Populus spp., plantations. The pattern of natural
infestation of C. leucomelas among poplar hybrids with different pedigrees and the aphid intrinsic rate
of increase (rm), of C. leucomelas were assessed in the Þeld. In most of the hybrids, aphid abundance
peaked in March (late summer). Among 12 types of poplar crosses, [(P. trichocarpa Torr. & Gray
P. deltoides Bartram ex Marshall) (P. trichocarpa P. deltoides)] and [(P. trichocarpa P. maximowiczii
Henry) P. maximowiczii] showed the highest and lowest aphid densities, respectively. A
trend to Þnd more aphids in branch bases was apparent. The intrinsic rate of C. leucomelas increase
was higher in [(P. trichocarpa P. deltoides) P. deltoides] hybrids, and lower in [(P. trichocarpa
P. maximowiczii) P. trichocarpa] hybrids. Aphid density and performance were higher in hybrids
with P. deltoides parentage, whereas hybrids with P. maximowiczii parentage showed lower aphid
densities and performance. Hybrids with P. nigra L. parentage, namely, [P. trichocarpa P. nigra],
also had high aphid density, but aphid performance was lower compared with hybrids with P. deltoides
parentage. These results suggest that among poplar hybrids studied, susceptibility to C. leucomelas is
inherited through P. deltoides, whereas resistance seems to be inherited through P. maximowiczii.
Thus, P. maximowiczii hybrids are recommended for commercial or ornamental planting programs in
zones where there is a high risk of aphid infestation.
Disciplines :
Entomology & pest control
Author, co-author :
Ramírez, Claudio; Universidad de Talca- UTALCA > Instituto de Biología Vegetal y Biotecnología, Talca, CHILE
Zamudio, Francisco; Universidad de Talca- UTALCA > Facultad de Ciencias Forestales, Talca, CHILE
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