Simultaneous outbreaks of three species of larch web-spinning sawflies: influences of weather and stand structure

Fukuyama, Kenji; Isono, Masahiro; Takao, Gen

doi:10.1016/s0378-1127(03)00308-6

Cited by 11 publications

(3 citation statements)

References 17 publications

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“…They typically start in medium age to mature stands and last for several years. The same pattern was observed in plantations of similar type in Japan (Ozaki et al., ).…”

Section: Pest Categorisationsupporting

confidence: 79%

Pest categorisation of Cephalcia lariciphila

Jeger¹,

Bragard²,

Caffier³

et al. 2017

EFS2

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The Panel on Plant health performed a pest categorisation of the larch web-spinning sawfly Cephalcia lariciphila (Hymenoptera: Pamphiliidae) for the EU. The insect has been reported in 11 EU Member States (MSs). It is a quarantine pest listed in Annex IIB of Council Directive 2000/29/EC. Protected zones are in place in Ireland and the UK (Northern Ireland, Isle of Man and Jersey). C. lariciphila can feed on all species of the genus Larix. There have been reported outbreaks in the Czech Republic, Germany, the Netherlands and the UK (England and Wales) in plantations of European larch (Larix decidua) and Japanese larch (Larix kaempferi = Larix leptolepis). C. lariciphila is absent in the protected zones. The pest can enter the protected zones by human-assisted spread or by natural spread from EU areas where the pest is present. Plants for planting are considered the most important pathway for the pest. The pest can establish in the protected zones because the climatic conditions are similar to those of the 11 MSs where C. lariciphila is established, and the pest's main host plants are present. The prepupae overwinter in the litter, the adults emerge during May-June, and each female lays 30-40 eggs in slits in mature needles. The larvae feed on the needles through four instars. There is one generation per year; some of the prepupae undergo prolonged diapause for more than 1 year. The impact where the pest occurs is mainly related to the loss of tree growth following defoliation, while tree mortality was locally observed only after repeated defoliation. However, impact is likely to be mitigated by local biological control agents. All criteria assessed by EFSA above for consideration as a potential protected zone quarantine pest and as a potential regulated non-quarantine pest were met.

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“…They typically start in medium age to mature stands and last for several years. The same pattern was observed in plantations of similar type in Japan (Ozaki et al., ).…”

Section: Pest Categorisationsupporting

confidence: 79%

Pest categorisation of Cephalcia lariciphila

Jeger¹,

Bragard²,

Caffier³

et al. 2017

EFS2

View full text Add to dashboard Cite

show abstract

“…Although several studies have analyzed the relationship between pest density and stand characteristics, the results have always been ambiguous. In a previous study, Japanese larch (Larix leptolepis Gordon) density, tree height, DBH, and the proportion of larch stems were not strongly correlated with the prepupal densities of larch web-spinning sawflies (C. koebelei Rohwer) when larch stands had closed canopies [25]. McMillin et al [26] reported inconsistent effects of stem density on three species of sawflies.…”

Section: Discussionmentioning

confidence: 92%

Stand Characteristics and Soil Properties Affecting the Occurrence of Kunyushan Web-Spinning Sawfly (Cephalcia kunyushanica Xiao) in Japanese Red Pine (Pinus densiflora) Pure Forests in the Kunyushan Mountains, China

Ruirui

Liang

Xie

et al. 2018

Forests

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: The Kunyushan web-spinning sawfly (Cephalcia kunyushanica) is a major pest in the Japanese red pine (JRP, Pinus densiflora) pure forests in the Kunyushan Mountains of China. In this study, four stand types (ST1–4) were identified in plots of JRP pure forests, based on the pest severity index (PSI; ranging from 0–100). The order of infestation ratio in the four type stands was as follows: ST4 > ST3 > ST2 > ST1. We investigated the correlation of C. kunyushanica occurrence with stand characteristics and soil physicochemical properties in the four stand types. The results showed that all stand characteristics were different among the four stand types. Compared with infested plots, healthy (ST1) plots had a higher soil bulk density, and the differences among the groups were significant. Differences in soil water content, non-capillary porosity, and total porosity were significant among the four ST groups. The average organic matter content, total nitrogen (N), and available N were lower in ST1 plots, whereas total potassium (K) was higher compared with other ST groups. In addition, a redundancy analysis suggested that seven (total N, diameter at breast height (DBH), soil water content, bulk density, available K, zinc ion (Zn2+), and stem density) of 24 environmental variables were significantly correlated with the ordinations of C. kunyushanica occurrence. The results provide theoretical guidance for the ecological control of C. kunyushanica, and are also useful for the management of forests in areas where C. kunyushanica is a major pest and where site and stand conditions are similar.

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“…Long-term datasets have become important tools for correlating observed population fluctuations to observed weather patterns. This approach has been used with varying degrees of success for various species [10][11][12][13][14][15][16][17], revealing patterns and correlations related to the weather. Using long-term datasets changes in outbreak behavior of several species have been detected.…”

Section: Historical Data To Predict the Futurementioning

confidence: 99%

Insect Pests in Future Forests: More Severe Problems?

Björkman

Bylund

Klapwijk

et al. 2011

Forests

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Abstract:A common concern is that damage by insects will increase in forests as a consequence of climate change. We are assessing the likelihood of this predicted outcome by examining how other factors (especially changes in forest management practices) may interact with effects of climate change. Here we describe the strategies for improving understanding of the causes of insect outbreaks and predicting the likelihood of insect-mediated damage increasing in the future. The adopted approaches are: (i) analyses of historical data, (ii) comparison of life history traits of outbreak and non-outbreak species, (iii) experiments along climatic gradients to quantify the strength of trophic interactions, and (iv) modeling. We conclude that collaboration by researchers from many disciplines is required to evaluate available data regarding the complex interactions involved, to identify knowledge gaps, and facilitate attempts to progress beyond speculation to more robust predictions concerning future levels of insect damage to forests.

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Simultaneous outbreaks of three species of larch web-spinning sawflies: influences of weather and stand structure

Cited by 11 publications

References 17 publications

Pest categorisation of Cephalcia lariciphila

Pest categorisation of Cephalcia lariciphila

Stand Characteristics and Soil Properties Affecting the Occurrence of Kunyushan Web-Spinning Sawfly (Cephalcia kunyushanica Xiao) in Japanese Red Pine (Pinus densiflora) Pure Forests in the Kunyushan Mountains, China

Insect Pests in Future Forests: More Severe Problems?

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