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The effect of temperature on the functional response of Phytoseiulus persimilis (Acari: Phytoseiidae).

David J Skirvin¹, John S Fenlon

¹Department of Entomological Sciences, Horticulture Research International, CV35 9EF Wellesbourne, Warwick, UK. david.skirvin@hri.ac.uk

Experimental & Applied Acarology

|February 6, 2004

Summary

This summary is machine-generated.

Temperature significantly impacts the predatory behavior of Phytoseiulus persimilis on Tetranychus urticae. Optimal biological control occurs between 15-25°C, with reduced efficacy at higher temperatures.

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Area of Science:

Entomology
Ecology
Pest Management

Background:

Environmental variables, particularly temperature, critically influence biological control efficacy in ornamental crops.
Understanding predator-prey dynamics is essential for optimizing pest management strategies.

Purpose of the Study:

To investigate the effect of temperature on the functional response of Phytoseiulus persimilis (predator) to Tetranychus urticae (prey) eggs.
To develop a model describing the combined effects of temperature and prey density on predation rates.

Main Methods:

A novel functional response assay using plant stems as the arena was employed to assess predation.
Abbot's formula and a binomial model were used to analyze data, correcting for natural prey losses.
Predation rates were evaluated across a temperature range of 15°C to 30°C.

Main Results:

Predation rates increased with temperature from 15°C to 25°C.
A decline in prey consumption was observed at 30°C, though predation remained higher than at 20°C.
A combined equation was derived to predict predation based on temperature and prey density.

Conclusions:

Temperature plays a crucial role in the predatory efficiency of Phytoseiulus persimilis.
The findings suggest that current temperature regimes in some ornamental crops may exceed optimal conditions for this biological control agent.
Further research is needed to optimize biological control strategies considering temperature fluctuations.