Leafroller parasitism across an orchard landscape in central Washington and effect of neighboring rose habitats on parasitism

Pfannenstiel, R. S.; Mackey, Bruce E.; Unruh, Thomas R.

doi:10.1016/j.biocontrol.2012.04.006

Cited by 11 publications

(14 citation statements)

References 47 publications

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“…, Pfannenstiel et al. ) could potentially generate large‐scale pulses in parasitoid activity. Competitive interactions (Carothers and Jaksić , Taylor , Harvey et al.…”

Section: Discussionmentioning

confidence: 99%

“… , b), or indirectly by other factors, such as the abundance of alternate hosts (Pfannenstiel et al. ) or changes in phenological synchrony with the host (Godfray et al. ).…”

Section: Discussionmentioning

confidence: 99%

“…Mort6, mortality in 6th instar larvae; Pred7, predator-caused mortality in pupae; SBW, wild SBW population abundance (as assessed using pheromone traps); Elac, mortality caused by the parasitoid Elachertus cacoeciae; Trano, mortality caused by the parasitoid Tranosema rostrale; DD, degree-days; Prec, precipitation. A "d" placed before the variable indicates that it represents the difference between year y and y À 1. temporal variation, spatial variation in T. rostrale performance could be itself influenced directly by climate (Seehausen et al 2017a,b), or indirectly by other factors, such as the abundance of alternate hosts (Pfannenstiel et al 2012) or changes in phenological synchrony with the host (Godfray et al 1994). As for predation, it was generally more important in colder locations (Fig.…”

Section: Spatial Variationmentioning

confidence: 97%

“…5a,b), suggesting the existence of compensatory dynamics between the two species. Factors such as year-to-year variation in phenological mismatch between host and parasitoids (Godfray et al 1994, van Asch andVisser 2007), or changes in the availability of alternate sources of food such as nectar (Cappuccino et al 1999) or alternate hosts (Cappuccino et al 1998, Pfannenstiel et al 2012) could potentially generate large-scale pulses in parasitoid activity. Competitive interactions (Carothers and Jaksi c 1984, Taylor 1988, Harvey et al 2013 are also likely to be involved in explaining the compensatory patterns between T. rostrale and E. cacoeciae.…”

Section: Temporal Variationmentioning

confidence: 99%

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Do natural enemies explain fluctuations in low‐density spruce budworm populations?

Bouchard

Martel

Régnière

et al. 2018

Ecology

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Understanding the causal pathways through which forest insect outbreaks are triggered is important for resource managers. However, detailed population dynamics studies are hard to conduct in low-density, pre-outbreak populations because the insects are difficult to sample in sufficient numbers. Using laboratory-raised larvae installed in the field across a 1,000 km east-west gradient in Québec (Canada) over an 11-yr period, we examined if parasitism and predation were likely to explain fluctuations in low-density spruce budworm (Choristoneura fumiferana; SBW) populations. Parasitism rates by the two main larval parasitoid species, Elachertus cacoeciae and Tranosema rostrale, peaked during different years. This suggests that temporal fluctuations in overall parasitism were partly buffered by compensatory dynamics among parasitoid species. Still, spatial covariance analyses indicate that the residual interannual variation in parasitism rates was substantial and correlated over large distances (up to 700 km). On the other hand, interannual variation in predation rates was not spatially correlated. Piecewise structural equation models indicate that temporal variation in parasitism and predation does not influence temporal variation in wild SBW abundance. Spatially, however, SBWs installed in warmer locations tended to show higher parasitism rates, and these higher rates correlated with lower wild SBW population levels. Overall, the results indicate that large-scale drops in parasitism occur and could potentially contribute to SBW population increases. However, during the period covered by this study, other factors such as direct effects of weather on SBW larval development or indirect effects through host tree physiology or phenology were more likely to explain large-scale variation in wild SBW populations.

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“…, Pfannenstiel et al. ) could potentially generate large‐scale pulses in parasitoid activity. Competitive interactions (Carothers and Jaksić , Taylor , Harvey et al.…”

Section: Discussionmentioning

confidence: 99%

“… , b), or indirectly by other factors, such as the abundance of alternate hosts (Pfannenstiel et al. ) or changes in phenological synchrony with the host (Godfray et al. ).…”

Section: Discussionmentioning

confidence: 99%

Section: Spatial Variationmentioning

confidence: 97%

Section: Temporal Variationmentioning

confidence: 99%

See 2 more Smart Citations

Do natural enemies explain fluctuations in low‐density spruce budworm populations?

Bouchard

Martel

Régnière

et al. 2018

Ecology

View full text Add to dashboard Cite

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“…However, the response of insect pests to landscape changes and climate changes in this dynamic process and over long periods have not received much attention (Perrin and Phillips, 1978). The effects of pest damage on crop production in agro-ecosystems varied in different years due to landscape or climate changes, but the reasons for this are largely unknown (Pfannenstiel et al, 2012;Pluess et al, 2010). We selected six important insect pests to analyze how their damage was affected by global changes over time.…”

Section: Introductinmentioning

confidence: 99%

Landscape changes have greater effects than climate changes on six insect pests in China

Zhao

Sandhu

Ouyang

et al. 2016

Sci. China Life Sci.

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In recent years, global changes are the major causes of frequent, widespread outbreaks of pests in mosaic landscapes, which have received substantial attention worldwide. We collected data on global changes (landscape and climate) and economic damage caused by six main insect pests during 1951-2010 in China. Landscape changes had significant effects on all six insect pests. Pest damage increased significantly with increasing arable land area in agricultural landscapes. However, climate changes had no effect on damage caused by pests, except for the rice leaf roller (Cnaphalocrocis medinalis Guenee) and armyworm (Mythimna separate (Walker)), which caused less damage to crops with increasing mean temperature. Our results indicate that there is slight evidence of possible offset effects of climate changes on the increasing damage from these two agricultural pests. Landscape changes have caused serious outbreaks of several species, which suggests the possibility of the use of landscape design for the control of pest populations through habitat rearrangement. Landscape manipulation may be used as a green method to achieve sustainable pest management with minimal use of insecticides and herbicides. biological control, cropland expansion, global warming, mosaic landscape, pest damage Citation:

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The activities of generalist parasitoids can be segregated between crop and adjacent non-crop habitats

et al. 2016

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Non-crop habitat adjacent to crops may be important for enhancing the activity of natural enemies in crops. However, it is not always clear whether natural enemies that are active in non-crop habitats actually contribute to pest suppression in adjacent crop habitats. We hypothesised that parasitic wasps that utilise the same hosts can be segregated between crop and non-crop habitats in an agro-ecosystem. We tested this hypothesis using the light brown apple moth, Epiphyas postvittana (Walker) (Lepidoptera: Tortricidae), in vineyards and adjacent native vegetation. We experimentally measured the parasitism rate of larval E. postvittana at six and eight sites in both vineyards and the adjacent native vegetation in two consecutive years. Wild larval Tortricidae were also collected at each experimental site to assess their diversity and related parasitoids. Parasitised hosts were then identified using a PCR-based protocol to examine the parasitoids' host ranges. The parasitoid Therophilus unimaculatus (Turner) (Hymenoptera: Braconidae) was most active in non-crop native vegetation, whereas Dolichogenidea tasmanica (Cameron) (Hymenoptera: Braconidae) parasitised the most larvae in vineyards. Parasitism of E. postvittana by D. tasmanica was higher on grape than on plantain, which indicates that host plants influence activities in different habitat. Both species shared the same range of tortricid hosts. Overall, our results indicate the two key parasitoids that attack E. postvittana differ in their pattern of habitat use. The native vegetation adjacent to crops may not enhance the activity of some natural enemies for pest control in an agricultural ecosystem.

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Leafroller parasitism across an orchard landscape in central Washington and effect of neighboring rose habitats on parasitism

Cited by 11 publications

References 47 publications

Do natural enemies explain fluctuations in low‐density spruce budworm populations?

Do natural enemies explain fluctuations in low‐density spruce budworm populations?

Landscape changes have greater effects than climate changes on six insect pests in China

The activities of generalist parasitoids can be segregated between crop and adjacent non-crop habitats

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