Abstract
The functional response of the phytoseiid predator Chileseius camposi González y Schuster, 1962 (Acarina:Phytoseiidae) on densities of its prey Panonychus ulmi (Koch, 1836) was evaluated under controlled temperature (20 +/- 2 degrees C), relative humidity (75 +/- 15%) and photoperiod (16:8h L:D). A functional type II response was displayed (Holling's disk). Holling, Wolf transformation and Rogers models gave similar values for estimating parameters of the Holling's disk equation; however, estimates produced by the Livdahl and Stiven model were higher. Values of attack rate and handling time can be considered within the normal range for phytoseiid generalists.
Highlights
Chilesius camposi González y Schuster is a dominant phytoseiid mite associated in sympatry with the European red mite Panonychus ulmi (Koch) on apple tree Malus sylvestris Mill., in southern Chile (Venegas 1977, Guajardo 1993)
An increase in prey density eventually resulted in a higher predation rate
Initial prey density (No), observed mean number of prey attacked (Na) and expected number of prey attacked based on Holling (1959b) (NH), Woolf transformation (NW), Livdahl and Stiven (1983) (NL&S) and Rogers (1972) (NR) models
Summary
Chilesius camposi González y Schuster is a dominant phytoseiid mite associated in sympatry with the European red mite Panonychus ulmi (Koch) on apple tree Malus sylvestris Mill., in southern Chile (Venegas 1977, Guajardo 1993). Mori and Chant (1966) proposed a type IV, due they found a dome-shaped response resulting from confusing or inhibiting behavior of a timid predator and the consequent lower rate of attack at high prey densities.
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