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Methodology to Test Control Agents and Insecticides Against the Coffee Berry Borer Hypothenemus hampei

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Interactive effects of pests increase seed yield.

Vesna Gagic¹, Laura Ga Riggi¹, Barbara Ekbom¹

¹Department of Ecology Swedish University of Agricultural Sciences SE-75007 Uppsala Sweden.

Ecology and Evolution

|April 22, 2016

Summary

Multiple insect pests attacking oilseed rape can have non-additive impacts on seed yield. Plant overcompensation to combined damage from seed and stem weevils can increase yield, challenging single-pest economic thresholds.

Keywords:

Herbivore oilseed rape plant compensation plant damage pollen beetle weevils

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Area of Science:

Agricultural Entomology
Crop Science
Ecology

Background:

Crop seed yield losses from single pests are typically studied in isolation.
Crop plants face simultaneous attacks from multiple herbivores, with impacts not always additive.
Understanding interactive pest effects is crucial for crops with compensatory or overcompensatory abilities.

Purpose of the Study:

To investigate the interactive impacts of four insect pests on oilseed rape seed yield.
To determine if combined pest attacks alter individual pest effects on yield.
To assess the implications for current pest management strategies.

Main Methods:

Field study across 15 oilseed rape sites in Sweden.
Estimation of damage from seed and stem weevils, pollen beetles, and pod midges.
Analysis of pest pressure variation and correlation among pests to assess interactive impacts.

Main Results:

Individual pest damage generally had neutral or negative effects on seed yield, with pollen beetles showing the strongest negative impact.
High damage from seed and stem weevils, when combined, led to increased seed yield, suggesting plant overcompensation.
Pest pressure varied significantly among fields with low inter-pest correlations.

Conclusions:

Simultaneous insect pest attacks can lead to non-additive effects on crop yield.
Current pest management relying on single-species economic thresholds may be suboptimal and lead to excessive insecticide use.
Plant compensatory responses to multiple stressors can significantly influence overall yield outcomes.