Le hanneton forestier (Melolontha hippocastani Fabricius 1801) en phase épidémique dans le nord de l’Alsace

Nageleisen, Louis-Michel; Belouard, Thierry; Meyer, Joseph S.

doi:10.4267/2042/59290

Cited by 1 publication

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“…We installed 106 study plots in and around the Ingwiller Forest (Fig. 1; north-eastern France; 48°54′26.9″N 7°25′13.4″E), which is the site of the initial M. hippocastani outbreak in the Vosges Mountains (Nageleisen et al 2015). This region has a continental climate with long, severe winters and short, hot summers.…”

Section: Study Areamentioning

confidence: 99%

“…Outbreaks have been described in the Czech Republic (Švestka 2010;Švestka and Drapela 2009), Germany (Wagenhoff et al 2014) and Poland (Niemczyk et al 2017). As a natural disturbance, M. hippocastani outbreaks can either incite or contribute to forest dieback (Cours 2019a;Manion 1981;Nageleisen et al 2015). In north-eastern France (Vosges Mountains), forest cockchafer populations have been at epidemic levels since 2007 (Nageleisen et al 2015), and high larval densities have been recorded (11.4 ± 0.7 3 rd -instar larvae/m 2 in 2018 (Cours 2019a) and 6.0 ± 0.3 2 nd and 3 rd -instar larvae/m 2 in 2014 (Nageleisen et al 2015)).…”

Section: Introductionmentioning

confidence: 99%

“…As a natural disturbance, M. hippocastani outbreaks can either incite or contribute to forest dieback (Cours 2019a;Manion 1981;Nageleisen et al 2015). In north-eastern France (Vosges Mountains), forest cockchafer populations have been at epidemic levels since 2007 (Nageleisen et al 2015), and high larval densities have been recorded (11.4 ± 0.7 3 rd -instar larvae/m 2 in 2018 (Cours 2019a) and 6.0 ± 0.3 2 nd and 3 rd -instar larvae/m 2 in 2014 (Nageleisen et al 2015)). Empirically, a density above five (2 ndinstar) or two (3 rd -instar)/m 2 of M. hippocastani larvae induces a high mortality risk for forest plantations (Späth and Schanowski 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Empirically, a density above five (2 ndinstar) or two (3 rd -instar)/m 2 of M. hippocastani larvae induces a high mortality risk for forest plantations (Späth and Schanowski 2007). High larval densities are associated with tree regeneration mortality and, in the longer term, dieback in adult trees (Nageleisen et al 2015;Woreta and Sukovata 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Soil properties as well as other environmental factors appear to influence oviposition behavior, leading to an uneven distribution of M. hippocastani larvae in the forest (Nageleisen et al 2015;Niemczyk et al 2017;Švestka and Drapela 2009). Oviposition preference is an important aspect of female behavior because it has a great influence on the fitness of a species: the female insect's choice of an egglaying site is generally one of the last decisions taken to ensure her progeny's survival (Cury et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Oviposition preference of the forest cockchafer (Melolontha hippocastani Fabr. 1801) at the stand scale depends on oak proportion, canopy openness and ground accessibility

Cours

Nageleisen

Touffait

et al. 2021

Annals of Forest Science

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& Key message Melolontha hippocastani is a major pest in European mixed and broadleaf forests. Investigating its oviposition behavior, we observed that a dense shrub layer reduces the density of egg clusters and eggs in the soil. Conversely, canopy openness and a large proportion of oak appear as favoring conditions. & Context Melolontha hippocastani is a major pest in European mixed and broadleaf forests. In north-eastern France, an epidemic phase has been observed since 2007, characterized by a high mortality rate of seedlings and young trees, and by massive swarming flights every 4 years. & Aims We investigated the oviposition behavior of M. hippocastani in the northern Vosges Mountains. & Methods We set up study plots in the infected area after adults had emerged and the females had laid their eggs. We excavated pits and counted the eggs and egg clusters they contained. We also carried out dendrometric surveys. & Results A dense shrub layer had a negative effect on the density of egg clusters and the number of eggs in the soil, while canopy openness and the proportion of oak basal area had positive effects. & Conclusion We hypothesized that a dense shrub layer could create a barrier for females. On the other hand, an open canopy may improve conditions for the larvae in the soil, just as a high proportion of oak trees in the surrounding area may provide a good food source for both larvae and adults. We suggest several research orientations and propose guidelines for forest management in view of our results.

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Section: Study Areamentioning

confidence: 99%