Spatial distribution of flying <i>neodiprion sertifer</i> (hymenoptera, diprionidae) males in a mature <i>pinus sylvestris</i> stand as determined by pheromone trap catch

Simandl, J.; Anderbrant, Olle

doi:10.1080/02827589509382867

Cited by 12 publications

(7 citation statements)

References 19 publications

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“…Weather influences trap catch of N. sertifer, especially air temperature which has a positive relation explaining up to 86% of the variation in catch (J0nsson & Anderbrant, 1993). In addition, alternative lures (Anderbrant et al, 1992a, b), trap type and height of the traps (Simandl & Anderbrant, 1995) have been investigated for N. sertifer.…”

Section: Introductionmentioning

confidence: 99%

Influence of wind conditions and intertrap spacing on pheromone trap catches of male European pine sawfly, Neodiprion sertifer

Wedding

Anderbrant

Jönsson

1995

Entomologia Exp Applicata

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The spatial distribution of catches of male European pine sawfly, Neodiprion sertifer (Geoffr.) (Hymenoptera, Diprionidae), was studied using different pheromone trap arrays. In hexagonal trap groups, trap interference was evident by reduced catch in the central of seven traps spaced 10 to 40 m apart. When the trap spacings were either 5 or 80 m no significant reduction could be shown. The interaction was more pronounced for strong (100 μg) pheromone ([2S, 3S, 7S]‐3, 7‐dimethyl‐2‐pentadecanyl acetate) lures than for weak ones (10 μg). Similarly, the inner traps caught less than the outer traps in grids of 6 × 6 traps spaced 20 or 50 m apart. Mark‐release‐recapture experiments in the grid array confirmed that a majority of the males originated from outside the trap group and were caught in the first trap they encountered. There were no differences between catches in downwind, crosswind and upwind traps. Thus, no ‘overshooting’ was evident during average conditions, i.e. the sawflies did not divert from the trap initially attracting them by flying to the upwind trap. However, the proportion caught in the upwind traps increased with increasing wind velocity, suggesting more overlapping pheromone plumes at higher wind speeds. Also, the recapture rate of released males increased with increasing wind velocity up to a daily average of 3.1 m/s at 2 m, indicating that sawflies more easily find the pheromone source, probably due to a more stable pheromone puff trajectory during higher wind velocities. The application of pheromone traps in e.g. monitoring studies is discussed and a distance of at least 50 m between the traps with strong lures used in the present study is recommended to avoid trap interaction.

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Section: Introductionmentioning

confidence: 99%

Influence of wind conditions and intertrap spacing on pheromone trap catches of male European pine sawfly, Neodiprion sertifer

Wedding

Anderbrant

Jönsson

1995

Entomologia Exp Applicata

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“…This is an important factor to consider when using pheromone‐based control strategies in forestry or in orchards, but up to now there have been few direct investigations of this phenomenon. Most activity of tree defoliating insects occurs, of course, at the canopy level and trap catches of N. sertifer were sometimes more than 10 times as large in the canopy than at 2.5 m height (Simandl & Anderbrant, 1995).…”

Section: Resultsmentioning

confidence: 99%

Disruption of pheromone communication in the European pine sawfly, Neodiprion sertifer, at various heights

Anderbrant

2003

Entomologia Exp Applicata

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“…For example, the density of flying N. sertifer males is higher at canopy level than it is closer to the ground (Simandl & Anderbrant, 1995). Hence, if the trap had been placed higher up the tree, more N. sertifer may have been caught.…”

Section: Discussionmentioning

confidence: 99%

From where are insects recruited? A new model to interpret catches of attractive traps

Östrand¹,

Anderbrant²

2003

Agri and Forest Entomology

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1 Two new concepts describing the origin of insects caught in an attractive trap are presented. 2 Male European pine sawflies Neodiprion sertifer Geoffroy (Hymenoptera: Diprionidae) were marked and released from 50, 100, 200, 400 and 800 m in the four cardinal directions around a centrally placed pheromone trap. 3 Based on linear regression of transformed data, we calculated the seasonal sampling range (r s ) as 1040 m. 4 We estimated the previously defined`effective sampling area' (a) at 4.9 ha, assuming that the insects are evenly distributed around the trap and that they are attracted from a circular area around it. This is the area from which all insects originate if the trap is 100% effective within the area but captures nothing outside of it. The effective sampling area reveals nothing about the origin of the insects caught. We defined the Cumulative Proportional Catch (CPC) that gives the proportion of the trap catch that originates from an area within a distance r from the trap. At r r s CPC 1, and in our study 50% of the captured insects originated up to 450 m from the trap. Thus, for the trap used in this study, a relatively large proportion of the catch originates some distance from the trap. 5 We also defined the Catch Concentration (CC), which is the ratio of the radius of the effective sampling area (r a ) to r s . For our data, CC 0.12, which is intermediate to high compared to the few other studies that we have extracted information from. If r a is considerably lower than r s , then only a small proportion of the insects caught originate from close proximity to the trap. When r a is close to r s , the catch adequately mirrors the population within most of its sampling range. 6 By using these two new concepts, we will better understand why monitoring traps mirror the local population in some cases but not in others. This will help in designing more reliable monitoring programmes.

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Spatial distribution of flying neodiprion sertifer (hymenoptera, diprionidae) males in a mature pinus sylvestris stand as determined by pheromone trap catch

Cited by 12 publications

References 19 publications

Influence of wind conditions and intertrap spacing on pheromone trap catches of male European pine sawfly, Neodiprion sertifer

Influence of wind conditions and intertrap spacing on pheromone trap catches of male European pine sawfly, Neodiprion sertifer

Disruption of pheromone communication in the European pine sawfly, Neodiprion sertifer, at various heights

From where are insects recruited? A new model to interpret catches of attractive traps

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