Plant Protection (Scientific Journal of Agriculture)

Plant Protection (Scientific Journal of Agriculture)

Functional response of different developmental stages of Orius albidipennis (Reuter) (Hem.: Anthocoridae) feeding on the strawberry spider mite, Tetranychus turkestani (Ugarov & Nikolski) (Acari: Tetranychidae)

Document Type : Research paper-Persian

Authors
Hossein Hasanzadeh
Mehdi Esfandiari
parviz shishehbor
Ali Rajabpour
10.22055/ppr.2015.11377
Abstract
The strawberry spider mite, Tetranychus turkestani (Ugarov & Nikolski) is one of the most important pests of agricultural crops in Iran. Orius albidipennis (Reuter) is also an active predator of spider mites in agricultural ecosystems in Iran. One of the characters which is used for the evaluation of predators is their response to the different densities of prey (functional response). Functional response of different developmental stages of this bug by feeding on adult female T. turkestani was investigated at 25 ± 1 ºC, 60 ± 5% RH and a photoperiod of 16:8 (L:D) h under laboratory condition. The experiments were carried out in a petri (10 cm diameter) on a bean leaf with the densities of 5, 10, 20, 30, 50 and 70 adult female mites. Mean maximum feeding rate of first, second, third, fourth and fifth nymphal stages as well as female and male adults of this bug were 9.6, 23, 34.8, 39.2, 48.1, 56.4 and49.1female adult T. turkestani, respectively. Functional response of all developmental stages (except for fourth nymphal stage) was of the Holling’s type II. Fourth nymphal stage showed Holling’s type III. Based on the Rojer’s equation, estimated attack rates of O. albidipennis were0.0654, 0.0678, 0.075, 0.0098, 0.1834, 0.1691 and0.165 and estimated handling times were 2.3048, 0.8259, 0.4684, 0.6585, 0.3666, 0.2484 and 0.3336 h for the first, second, third, fourth, fifth, female and male adult, respectively.
Keywords
Functional response
Orius albidipennis
Tetranychus turkestani