The Pine Sawfly in Central France

Geri, C.

doi:10.1007/978-1-4899-0789-9_19

Cited by 61 publications

(66 citation statements)

References 31 publications

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“…This could lead to a total defoliation of host trees in the peak phase of population dynamics [9,10]. Mature and maturing trees have the highest defoliation risk [10,11], and trees of that age have the highest economic value. A massive outbreak by D. pini occurred in dry and dryish pine forests in central Finland between 1997 and 2001, covering 500,000 ha [6].…”

Section: Introductionmentioning

confidence: 99%

Classification of Defoliated Trees Using Tree-Level Airborne Laser Scanning Data Combined with Aerial Images

Kantola

Vastaranta

et al. 2010

Remote Sensing

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Climate change and rising temperatures have been observed to be related to the increase of forest insect damage in the boreal zone. The common pine sawfly (Diprion pini L.) (Hymenoptera, Diprionidae) is regarded as a significant threat to boreal pine forests. Defoliation by D. pini can cause severe growth loss and tree mortality in Scots pine (Pinus sylvestris L.) (Pinaceae). In this study, logistic LASSO regression, Random Forest (RF) and Most Similar Neighbor method (MSN) were investigated for predicting the defoliation level of individual Scots pines using the features derived from airborne laser scanning (ALS) data and aerial images. Classification accuracies from 83.7% (kappa 0.67) to 88.1% (kappa 0.76) were obtained depending on the method. The most accurate result was produced using RF with a combination of data from the two sensors, while the accuracies when using ALS and image features separately were 80.7% and 87.4%, respectively. Evidently, the combination of ALS and aerial images in detecting needle losses is capable of providing satisfactory estimates for individual trees.

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Section: Introductionmentioning

confidence: 99%

Classification of Defoliated Trees Using Tree-Level Airborne Laser Scanning Data Combined with Aerial Images

Kantola

Vastaranta

et al. 2010

Remote Sensing

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“…E' seemed to possess a null allele. The specific female esterase E 4 was monomorphic and proceeded from the female cementary gland (Beaudoin and Allais, 1991 (Géri, 1988;Géri andGoussard, 1988, 1991;Beaudoin et al, 1992 France to the north as described previously (Géri and Goussard, 1984 (Knerer and Atwood, 1973).…”

Section: Resultsmentioning

confidence: 89%

“…However, this classification may be defective owing to the permanent dependence of the sawfly reaction to the photoperiod and temperature conditions previously experienced by the insect during its whole life cycle, as shown by Géri andGoussard (1988, 1991 (Pamilo et al, 1978;Kuenzi and Coppel, 1986;Woods and Guttman, 1987). D pini has only been the subject of brief study of individual allozymic variability (Steinhauer, 1979).…”

mentioning

confidence: 99%

Enzymatic polymorphism in natural populations of the sawfly Diprion pini L (Hymenoptera: Diprionidae)

Beaudoin¹,

Allais²,

Geri³

1997

Ann. For. Sci.

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“…The common pine sawfly (Diprion pini L., Hymenoptera: Diprionidae) is distributed throughout Europe and northern Africa (Geri 1988). Until the 1990's the species caused only small-scale defoliation of P. sylvestris in Finland (De Somviele et al 2007).…”

Section: Introductionmentioning

confidence: 99%

“…In Finland the economic losses of reduced tree growth and mortality related to D. pini has been estimated to be 93-530 US$ ha -1 depending on defoliation intensity (Lyytikä-inen-Saarenmaa & Tomppo 2002). Overall, sawfly outbreaks seem to be more frequent and severe on monoculture, evenaged and plantation stands, compared to forests with several tree species, age classes and layers (Geri 1988, McMillin & Wagner 1993. In Scandinavia, the performance of pine sawflies and the frequency, intensity and spatial extent of damage has been related to temperature (Kollberg et al 2015) and host plant quality, especially needle carbohydrate and terpene concentrations (Larsson et al 1986, Lyytikäinen 1994, Kollberg et al 2015.…”

Section: Introductionmentioning

confidence: 99%

Influence of soil and topography on defoliation intensity during an extended outbreak of the common pine sawfly (Diprion pini L.)

Kosunen¹,

Kantola²,

Starr³

et al. 2017

iForest

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Insect herbivore disturbances are likely to intensify as a consequence of climate change. In Finland, outbreaks of the common pine sawfly (Diprion pini L.), which feeds on Scots pine (Pinus sylvestris L.) needles, and resulting damage to forests have already increased. Although drivers of sawfly outbreak dynamics have been investigated, the effects of topography and soil fertility have not been fully elucidated. We studied the effect of elevation, slope and soil properties (carbon and nitrogen contents, C/N ratio, pH, texture and horizon thicknesses) on the defoliation intensity of 28 plots (227-531 m 2 ), located in a 34.5 km 2 forested area in eastern Finland suffering from an extended outbreak of D. pini. Plot elevation and slope (relative relief 35 m, maximum elevation 200 m a.s.l.) were derived from a digital elevation model and the soil properties from samples of the humus layer (Of+Oh), (Ah+)E and B horizons of podzol profiles. Defoliation was greater on the more fertile and flatter sites than on less fertile and steeper sites, but independent of elevation. The soil property most strongly correlated to plot mean defoliation was the C/N ratio of the humus layer (Spearman's ρ = -0.68). However, logistic modelling showed that the thickness of the (Ah+)E-horizon had the highest classification accuracy in predicting the probability of a plot having moderate to severe (>20%) defoliation. Our study showed that forest damage caused by D. pini was related to topography and soil fertility. Taking these factors into account could help in understanding the population dynamics of D. pini, in modeling of insect outbreaks and in forest management planning.

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The Pine Sawfly in Central France

Cited by 61 publications

References 31 publications

Classification of Defoliated Trees Using Tree-Level Airborne Laser Scanning Data Combined with Aerial Images

Classification of Defoliated Trees Using Tree-Level Airborne Laser Scanning Data Combined with Aerial Images

Enzymatic polymorphism in natural populations of the sawfly Diprion pini L (Hymenoptera: Diprionidae)

Influence of soil and topography on defoliation intensity during an extended outbreak of the common pine sawfly (Diprion pini L.)

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