بررسي رفتار شكارگري سن ORIUS NHGER WOLFF روي تريپس پياز THRIPS TABACI LIND در شرايط آزمايشگاه

Study on predatory behavior of Orius niger Wolff on onion thrips Thrips tabaci Lind. in laboratory conditions

The parameters of the predatory activity in densities I and 4, gut content and constant rate of gut emptying of the predatory bug, Orius niger Wolff on cucumber leaf disc containing of second onion thrips larvae, Thrips tabaci Lind. were studied under laboratory conditions (26 °C, 65±5 % rh). hunting and attack behavior of the predator and prey reaction were also investigated. The mean parameters of predation rate were recorded 6.22±1.18, 8.60±0.76 preys killed per hour; encounter rate 0.525±0.08, 0.724±0.029 h^-1; success ratio 0.973±0.14, 0.852±0.041and handling time 4.095±0.672, 3.006±0.520 larvae per minute in 1 and 4 densities respectively. Of these parameters, the encounter rate and success ratio were significantly higher in densities of 4 than 1. Gut capacity and the rate constant of gut emptying were 0.059 mg, and 0.151 h-ʹ. The effect of interference on predatorʹs behavior is discussed.