prey preference of natural enemies is among the phenomena that should be considered in determining the efficacy of natural enemies. when the predators are faced with a choice between two or more preys, they often show their preference to one from among them. temperature is one of the environmental factors that can affect insect foraging behavior. two aphid species namely aphis fabae and acyrtho...

Predators determine herbivore and plant biomass via so-called trophic cascades, and the strength of such effects is influenced by ecosystem productivity. To determine whether evolutionary trade-offs among plant traits influence patterns of trophic control, we manipulated predators and soil fertility and measured impacts of a major herbivore (the aphid Aphis nerii) on 16 milkweed species (Asclep...

the distribution pattern of pest population is one of the factors not only effects on sampling program and data analysis method, but also can be used to measure the density of pests and their natural enemies. thus, the spatial distribution pattern of the pea aphid, acyrthosiphon pisum harris (hem.: aphididae) and its two major predators, hippodamia variegata goeze (col.: coccinellidae) and cocc...

Resource consumption often increases with greater consumer biodiversity. This could result either from complementarity among consumers or the inclusion of particular key species, and it is often difficult to differentiate between these two mechanisms. We exploited a simple plant mutation (reduced production of surface waxes) to alter foraging within a community of aphid predators, and thus perh...

Performance of oleander aphid (Aphis nerii Boyer de Fonscolmbe) and large milkweed bug (Oncopeltus fasciatus Dallas) on 21 species of Asclepias was evaluated in a two-year field study. Season-long pest and beneficial insect population growth was monitored. Plant quality ratings also were obtained. Relative numbers of Monarch butterfly (Danaus plexippus (Linnaeus)) larvae were also recorded. All...


 Aphids generally attack vegetative plant parts, preferably leaves, and devitalize the by sucking cell sap. Thorough knowledge of pest-predator ecology their interaction is requisite to initiate timely pest management strategies. Therefore, we aimed study population dynamics aphids predators on tomato in Hisar, Haryana during Rabi, 2016-17 2017-18. We observed two dominant aphid species v...

Oleander is very frequently planted as an ornamental shrub in urban areas of the Mediterranean. Its most common pest aphid Aphis nerii, and heavy infestations produce aesthetic damage disturbances to citizens, they are sprayed with insecticides order reduce population density. One alternative method conservation biological control which enhanced by provisioning food, refuges, reproduction sites...

Facultative endosymbionts can induce benefits and costs to their aphid hosts. In the pea aphid, Acyrthosiphon pisum (Harris) (Hemiptera: Aphididae), infection with ?-proteobacterium Hamiltonella defensa Moran et al. confer resistance against parasitoids, but may also reduce frequency of aggressive escape behaviours exhibited in response predators. potato aphids, Macrosiphum euphorbiae (Thomas) ...