Author
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Fisher, James |
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Submitted to: Agricultural and Forest Entomology
Publication Type: Peer Reviewed Journal Publication Acceptance Date: 6/2/2006 Publication Date: 9/13/2006 Citation: Fisher, J.R. 2006. Fecundity, longevity, and establishment of Otiorhynchus sulcatus (Fabricius) and Otiorhynchus ovatus (Linnaeus) (Coleoptera: Curculionidae) from the Pacific Northwest of the United States of America on selected host plants. Agricultural and Forest Entomology. 8:281-287. Interpretive Summary: The egg production, longevity and establishment of Otiorhynchus sulcatus and Otiorhynchus ovatus from the Pacific Northwest of the United States was studied on five selected host plants: Picea abies ‘Nidiformis’, Picea glauca ‘Conica’, Taxus baccata, Rhododendron catawbiense ‘Boursault’ and Fragaria X ananassa ‘Totem’. Newly emerged adult weevils were used to study adult longevity and reproductive success. Fragaria x ananassa ‘Totem’ produced the longest survival, shortest preoviposition time, the greatest number of eggs, and the highest fertility for adults of both species. Picea spp. were not good adult hosts for O. sulcatus. Taxus was a good adult host for O. sulcatus but was a non-host for adults and larvae of O. ovatus. Adult hosts did not affect preoviposition time or egg viability with O. ovatus adults. But with O. sulcatus, preoviposition time was greatly increased and egg hatch was < 50% with Picea spp. The best larval host was F. x a.‘Totem’ for O. sulcatus and P. g.‘Conica’ for O. ovatus. Rhododendron was a poor larval host for both species. It appears that when all of the studies on these two pests are considered, O. sulcatus may be diverging in host preference from one geographic area to another, but O. ovatus has a more universal host selection. Thus, further studies with O. sulcatus should consider comparative studies across geographic origins. Technical Abstract: The fecundity, longevity and establishment of Otiorhynchus sulcatus and Otiorhynchus ovatus from the Pacific Northwest of the United States was studied on five selected host plants: Picea abies ‘Nidiformis’, Picea glauca ‘Conica’, Taxus baccata, Rhododendron catawbiense ‘Boursault’ and Fragaria x ananassa ‘Totem’. Teneral adults were used to study adult longevity and reproductive success. Leaves of these host plants were used for sustenance for nine months. Larval establishment was studied by infesting eggs on potted host plants. Fragaria x ananassa ‘Totem’ produced the longest survival, shortest preoviposition time, the greatest number of eggs, and the highest fertility for adults of both species. Picea spp. were not good adult hosts for O. sulcatus. Taxus was a good adult host for O. sulcatus but was a non-host for adults and larvae of O. ovatus. Adult hosts did not affect preoviposition time or egg viability with O. ovatus adults. But with O. sulcatus, preoviposition time was greatly increased and egg viability was < 50% with Picea spp. The best larval host was F. x a.‘Totem’ for O. sulcatus and P. g.‘Conica’ for O. ovatus. Rhododendron was a poor larval host for both species. It appears that when all of the studies on these two pests are considered, O. sulcatus may be diverging in host preference from one geographic area to another, but O. ovatus has a more universal host selection. Thus, further studies with O. sulcatus should consider comparative studies across geographic origins. |
