Effect of Reforestation Methods on Pine Weevil (Hylobius abietis) Damage and Seedling Survival

Örlander, Göran; Nilsson, Urban

doi:10.1080/02827589950152665

Cited by 158 publications

(151 citation statements)

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“…Hylobius abietis breeds in fresh conifer stumps and feeds on young seedlings; hence it is a major pest where clearfelling and replanting is practiced and represents a serious obstacle to successful reforestation (Orlander and Nilsson, 1999). Adult H. abietis are attracted to clearfell sites by the volatiles from cut or damaged coniferous trees (Nordlander, 1987;Nordlander et al, 1986).…”

Section: Introductionmentioning

confidence: 99%

Suppression of the large pine weevil Hylobius abietis (L.) (Coleoptera: Curculionidae) in pine stumps by entomopathogenic nematodes with different foraging strategies

et al. 2006

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Hylobius abietis is the most important pest of reforestation in Northern Europe. Weevils develop in stumps of felled conifers and emerging adults feed on and kill young trees. In trials conducted in each of 3 years, entomopathogenic nematodes were applied around pine stumps containing late instar weevils. Since these immature weevils are sedentary and occur within stumps at varying depths in soil, it is predicted that nematodes with a cruise foraging strategy, such as Heterorhabditis spp., should be most eVective. The three commercially available species used in our trials, H. megidis, Steinernema feltiae, and S. carpocapsae, have cruise, intermediate and ambush strategies, respectively. We also included the indigenous species H. downesi and a strain of S. feltiae isolated from an Irish coniferous forest. Heterorhabditis downesi suppressed emergence of adult weevils in 2 of 3 trials; and commercial S. feltiae and H. megidis NLH85 in 1 trial each. Stump excavation showed that H. downesi parasitized 55-63% of developing weevils; this was matched by H. megidis NLH85 and S. carpocapsae in 2 and 1 years, respectively. A higher proportion of larvae (46%) than of pupae (32%) or callow adults (30%) were parasitized by nematodes. All nematodes, including S. carpocapsae, parasitized weevils 40-49 cm from the bole of the stump and 30-39 cm below soil level. We conclude that heterorhabditids, particularly H. downesi, have greatest potential against pine weevils in stumps, but that a reputation as an ambush forager should not exclude a species such as S. carpocapsae from trials against sedentary subterranean insect pests.

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Section: Introductionmentioning

confidence: 99%

Suppression of the large pine weevil Hylobius abietis (L.) (Coleoptera: Curculionidae) in pine stumps by entomopathogenic nematodes with different foraging strategies

et al. 2006

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“…In North America its niche is filled by two species from the same genus, Hylobius congener Dalla Torre (Martin, 1964) and Hylobius pales Herbst (Coleoptera: Curculionidae) (Lynch, 1984). It is the adult weevils that cause the financial damage, by feeding on and killing replanted seedlings (Orlander and Nilsson, 1999). This feeding not only causes seedling mortality but also reduced growth and stem deformation (Eidmann et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

The lethal and sub-lethal consequences of entomopathogenic nematode infestation and exposure for adult pine weevils, Hylobius abietis (Coleoptera: Curculionidae)

Girling

Ennis

Dillon

et al. 2010

Journal of Invertebrate Pathology

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a b s t r a c tEntomopathogenic nematodes (EPN) frequently kill their host within 1-2 days, and interest in EPN focuses mainly on their lethality. However, insects may take longer to die, or may fail to die despite being infected, but little is known about the effects of EPN infection on insects, other than death. Here we investigate both lethal and sub-lethal effects of infection by two EPN species, Steinernema carpocapsae and Heterorhabditis downesi, on adults of the large pine weevil, Hylobius abietis. Following 12 h nematode-weevil contact in peat, S. carpocapsae killed a significantly higher proportion of weevils (87-93%) than H. downesi (43-57%) at all concentrations tested. Less than 10% of weevils were dead within 2 days, and weevils continued to die for up to 10 days after exposure (LT 50 of 3 days or more). In a separate experiment, live weevils dissected 6 days after a 24 h exposure to nematodes on filter paper harbored encapsulated and dead nematodes, showing that weevils could defend themselves against infection. Some live weevils also harbored live nematodes 6 days after they had been removed from the nematode infested medium. Feeding by weevils was not affected by infection with, or exposure to, either species of EPN. We discuss these results in relation to the use of EPN in biological control against H. abietis.

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“…Upon emergence, adult weevils feed on young seedlings and can cause significant mortality: a single adult can damage or kill several young plants (Eidmann andLindelow 1997, Heritage andMoore 2001) and thus even a low number of adults emerging from stumps can have a significant impact on sites that have been replanted. Current approaches to management of LPW are moving away from pesticide applications and there is a need for more environmentally sustainable approaches, besides delaying of restocking (Leather et al 1999;Ö rlander and Nilsson 1999;Ö rlander and Nordlander 2003).…”

Section: Introductionmentioning

confidence: 99%

Optimizing the application method of entomopathogenic nematode suspension for biological control of large pine weevil Hylobius abietis

et al. 2017

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Entomopathogenic nematodes (EPNs) are effective against the immature stages of the large pine weevil Hylobius abietis. In three field trials we compared the efficacy of the application method of EPN for weevil suppression below the suggested threshold of 20 weevils per stump: applying the EPN suspension in the top edges of the stumps ('top') vs. drenching the soil around stumps ('standard'). For Steinernema carpocapsae, weevil suppression was below the targeted threshold only when suspension was applied in the standard way (two of the three sites). On the other hand, weevil suppression was provided in all three cases of 'top' application of Heterorhabditis downesi suspension, whereas suppression in 'standard' application was observed in one site. Percentage parasitism of developing weevils in relation to depth and distance help explain EPN movement post-application. Weevil suppression relative to suggested thresholds can be improved by altering the method of EPN application depending on the nematode species.

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Effect of Reforestation Methods on Pine Weevil (Hylobius abietis) Damage and Seedling Survival

Cited by 158 publications

References 0 publications

Suppression of the large pine weevil Hylobius abietis (L.) (Coleoptera: Curculionidae) in pine stumps by entomopathogenic nematodes with different foraging strategies

Suppression of the large pine weevil Hylobius abietis (L.) (Coleoptera: Curculionidae) in pine stumps by entomopathogenic nematodes with different foraging strategies

The lethal and sub-lethal consequences of entomopathogenic nematode infestation and exposure for adult pine weevils, Hylobius abietis (Coleoptera: Curculionidae)

Optimizing the application method of entomopathogenic nematode suspension for biological control of large pine weevil Hylobius abietis

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