Abstract
The study aimed to investigate the effect of different densities of M.persicae and T. tabaci on the predatory ability of the predator O. albidipennis and determine the preference for one of the two prey, in addition to assessing the in vitro predator's efficiency in reducing the number of aphids on the carrot plant. The results indicated that the rates of predated adult and nymph thrips were significantly higher than that of predated aphids. The highest rate of predation for nymphs and adults thrips was 33.2 and 25 preys per day, respectively, at a density of 60prey/container, while the highest rate of predation of adults and nymphs of aphids was 19 and 13.2prey/day, respectively, at a density of 60prey/container. The food preference experiment showed that the adults of the predator O. albidipennis feed on the immature stages thrips and aphids when introduced together and have no clear preference for one of the prey. The results of evaluating the efficiency of predator adults on reducing different densities of aphids showed that the predator was effectively able to reduce the population increase of aphids when the insect densities were 10, 20 or 30 insect. however, the predator was not effective when introduced to aphids at starting density of 40, no significant difference was found due to predator presence or absence as the aphids population density were 118.4 and 135.2 insects/cage after four days, respectively.
Highlights
The green peach aphid Myzus persicae Sulzer (Homoptera: Aphididae) is an important pest on vegetable and fruit crops in different regions of the world, infects more than 400 species of plants [1,2]
It is difficult to control these pests with insecticides due to their small size and hidden habits [5], and their development of insecticide-resistant groups [6,7]
Due to the importance of these pests and the lack of studies on the ability of the predator O. albidipennis to control these pests, this study aimed to evaluate predator predation rates for different population densities of M. persicae and T. tabaci, and determine whether there is a preference for one of the two prey, in addition to evaluating the predator's efficiency in Reducing the population of aphids on carrot plant under laboratory conditions
Summary
The green peach aphid Myzus persicae Sulzer (Homoptera: Aphididae) is an important pest on vegetable and fruit crops in different regions of the world, infects more than 400 species of plants [1,2]. It is difficult to control these pests with insecticides due to their small size and hidden habits [5], and their development of insecticide-resistant groups [6,7]. Among the most successful control agents against common pests such as thrips, whitefly, mites and aphids [8,9,10,11,12] The success of this predator is due to a set of behavioral and environmental characteristics, including the predator's ability to be present on crops when pests are absent or at low densities, and its ability to supplement its diet with alternative plant sources that enable it to survive periods of absence of prey[11,12,13,14]. The predator's high reproduction rate, its relatively easy production in large quantities, its ability to respond to different environments, the fact that all its stages are predators and its high potential to prey on more than its need, make it successful in a rapid response to increasing the number of pests
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