predation rate is basic to any investigation of prey-predator interaction and a major component in the selection of predators for biological control. the predation rate of variegated lady beetle, hippodamia variegata (goze), fed on different densities (20, 40, 60, 80 and 100) of third instar nymphs of cotton aphid, aphis gossypii glover, was studied under laboratory conditions (25 ± 1 °c, 65 ± ...

the green peach aphid,myzuspersicae  (hem:aphididae) is a polyphagus aphid species that infects over 400 plants species belonging to 40 different families. the oenopia conglobata contaminata  (col.: coccinellidae) is one of the most important predator of orchard pests in iran. in this study, efficiency and predatory of this predatoron green peach aphid m.persicaewas evaluated under laboratory c...

the stage specific functional response of the acarophagous ladybird beetle stethorus gilvifrons mulsant to varying densities of citrus brown mite eutetranychus orientalis (klein) eggs was examined in a simplified castor bean leaf arena under laboratory conditions. all stages of s. gilvifrons were individually isolated for 24 hours with different prey densities at 30âºc and a photoperiod of 14: ...

In this study we investigated predation rates on third instar larvae of Chrysomya putoria and C. megacephala by third instar larvae of C. albiceps in a two-choice situation. The highest predation rate occurred on C. putoria larvae and this result is compared to previous experiments, in which C. macellaria larvae were present. Our results suggest that, when C. macellaria is absent C. albiceps la...

The invasive container-dwelling mosquito Aedes albopictus (Skuse) shows modest behavioral responses to water-borne cues from predatory Corethrella appendiculata Grabham in North America. We investigate whether Ae. albopictus adjust their antipredatory responses to be proportional to size-dependent risk of predation. Fourth-instar Ae. albopictus attain a size refuge from C. appendiculata predati...

The decline of Coccinella novemnotata Herbst, the ninespotted lady beetle, across North America has been attributed to the introduction of Coccinella septempunctata L. It has been suggested that C. septempunctata negatively impacted C. novemnotata through a combination of mechanisms. We investigated the effects of scramble competition and intraguild predation between groups of C. septempunctata...

Using larval Cx. annulirostris mosquitoes, this study compared the predation rate of Pseudomugil signifer and Gambusia holbrooki for four larval instars, three prey densities, and three vegetation densities. There was no significant difference in the quantity of first, second, and third instar larvae consumed by the two fish species after 24 h. There was a significant negative relationship betw...

cryptoleamus montrouzieri is the most important natural enemy of pseudococcus citri. the effects of different temperatures and different densities of c. montrouzieri on predation rate, searching efficacy and mutual interference of the mentioned coccinellid feeding on the nymphs of p. citri was studied. hassel and varley model was applied for estimation of interference constant. according to the...