Responses of Neodiprion sertifer (Hym., Diprionidae) larvae to variation in needle resin acid concentration in Scots pine

Larsson, Stig; Björkman, Christer; Gref, Rolf

doi:10.1007/bf00377113

Cited by 98 publications

(79 citation statements)

References 47 publications

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“…Fitness components of herbivorous insects are often negatively correlated with increasing levels of plant allelochemicals (Harborne 1982(Harborne , 1988Rosenthal and Berenbaum 1991;Speight et al 1999) and with morphological features such as trichomes (Gange 1995;Lambert et al 1995) or the toughness of leaves and stems (Raupp 1985;Stevenson et al 1993;Eigenbrode et al 1995). As with resistance, intraspecific variation in host plant quality is often genetically based (Whitham 1983;Larsson et al 1986;McCrea and Abrahamson 1987;Karban 1992).…”

mentioning

confidence: 99%

Inbreeding Alters Resistance to Insect Herbivory and Host Plant Quality in Mimulus Guttatus (Scrophulariaceae)

2002

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Abstract. Previous studies have demonstrated genetic variation for resistance to insect herbivores and host plant quality. The effect of plant mating system, an important determinant of the distribution of genetic variation, on host plant characteristics has received almost no attention. This study used a controlled greenhouse experiment to examine the effect of self-and cross-pollination in Mimulus guttatus (Scrophulariaceae) on resistance to and host plant quality for the xylem-feeding spittlebug Philaenus spumarius (Homoptera: Cercopidae). Spittlebugs were found to have a negative effect on two important fitness components in M. guttatus, flower production and aboveground biomass. One of two M. guttatus populations examined showed a significant interaction between the pollination and herbivore treatments. In this case, the detrimental effects of herbivores on biomass and flower production were much more pronounced in inbred (self) plants. The presence of spittlebug nymphs increased inbreeding depression by as much as three times. Pollination treatments also had significant effects on important components of herbivore fitness, but these effects were in opposite directions in our two host plant populations. Spittlebug nymphs maturing on self plants emerged as significantly larger adults in one of our host plant populations, indicating that inbreeding increased host plant quality. In our second host plant population, spittlebug nymphs took significantly longer to develop to adulthood on self plants, indicating that inbreeding decreased host plant quality. Taken together these results suggest that the degree of inbreeding in host plant populations can have important and perhaps complex effects on the dynamics of plant-herbivore interactions and on mating-system evolution in the host.

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mentioning

confidence: 99%

Inbreeding Alters Resistance to Insect Herbivory and Host Plant Quality in Mimulus Guttatus (Scrophulariaceae)

2002

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“…Similar adverse effects of feeding on non-preferred current-year needles have been observed in the pine-feeding sawfly Neodiprion sertifer (Niemelä et al, 1984). The poorer performance of larvae on current-year needles is likely to be caused by higher concentrations of defensive compounds such as resin acids in younger needles (Hanover, 1975;Larsson et al, 1986). Several studies on pine-feeding insects have documented decreased host plant resistance or increased suitability after defoliation (Niemelä et al, 1984(Niemelä et al, , 1991Wagner & Evans, 1985;McMillin & Wagner, 1997).…”

Section: Discussionmentioning

confidence: 75%

Performance of pine looper Bupalus piniarius larvae under population build‐up conditions

Smits

2002

Entomologia Exp Applicata

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In the first year of an outbreak, Bupalus piniarius larvae, encounter intense crowding. In the later stages of larval development, they are forced to feed on the non-preferred current-year needles of Scots pine or even on alternative hosts. It was hypothesized that larval feeding on a non-preferred resource (current-year needles) will negatively affect B. piniarius performance. It was also hypothesized that larval mutual interference (crowding without competition for food) will have negative additive effects. These hypotheses were tested in laboratory and field experiments. Fourth instar larvae were reared singly and under crowded conditions in cohorts of ten. Larvae in both situations were reared on control branches (containing both mature and current-year shoots) and branches containing only current-year shoots. Crowded larvae were reared also on Norway spruce, an alternative host. Crowding and feeding on a non-preferred resource had opposite effects on B. piniarius larval performance. Crowding in the late larval instars enhanced larval performance while absence of the preferred resource had negative effects. Larval growth rate was higher and development time was shorter for larvae exposed to crowded conditions than for solitary larvae. There was, however, no difference between the groups in final pupal weights or survival. Survival was 25% lower for larvae feeding on non-preferred current-year needles and pupal weights 9% lower, compared with results for larvae feeding on mature needles. Larvae feeding on Norway spruce suffered greatly extended development time, 82% lower survival, and resulted in 60% lighter pupae compared with conspecifics on Scots pine. It was concluded that not only quantity but also quality of the available food resource is critical for B. piniarius development.

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“…C-based defensive compounds, such as resin acids (Larsson et al 1986), phenolics (Giertych et al 2007) and 3-carene monoterpene (Barre et al 2003) have been found to have negative effects on pine sawfly performance. Bryant et al (1983) suggested that plants growing on nutrientpoor sites have a surplus of C from which they can allocate a part to C-based defense compounds.…”

Section: Soil Fertility Effectsmentioning

confidence: 99%

“…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. In addition, site and stand characteristics, such as site type and stand age (Larsson & Tenow 1984, De Somviele et al 2007, Nevalainen et al 2015, and natural enemies (Hanski & Parviainen 1985, Kollberg et al 2014) have been observed to modify sawfly performance and affect the level of tree damage.…”

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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Responses of Neodiprion sertifer (Hym., Diprionidae) larvae to variation in needle resin acid concentration in Scots pine

Cited by 98 publications

References 47 publications

Inbreeding Alters Resistance to Insect Herbivory and Host Plant Quality in Mimulus Guttatus (Scrophulariaceae)

Inbreeding Alters Resistance to Insect Herbivory and Host Plant Quality in Mimulus Guttatus (Scrophulariaceae)

Performance of pine looper Bupalus piniarius larvae under population build‐up conditions

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

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