Life table parameters and predation of Orius niger Wolff (Hemiptera: Anthocoridae) feeding on two different preys

Tetranychus cinnabarinus Boisduval (Acari: Tetranychidae) ve Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) üzerinde beslenen Orius niger (Hemiptera: Anthocoridae)' in gelişme süresi, ömrü, üreme gücü ve av tüketim kapasitesi, 25±1 °C sıcaklık, %65±10 orantılı nem ve 16 saat aydınlık koşulları içeren iklim odasında araştırılmıştır. Erkeklerin üçüncü nimf dönemi ve dişilerin beşinci nimf dönemleri hariç, T. cinnabarinus ve B. tabaci ile beslenen O. niger' in erkek ve dişi bireylerin yumurta, nimf ve toplam gelişme süreleri, besin kaynakları arasında önemli farklılık göstermemiştir. B. tabaci ile beslenen O. niger' in dişi ömür uzunluğu ve yumurtlama periyodu, T. cinnabarinus ile beslenmesine göre önemli derece uzun olmuştur. 8. tabaci ile beslenen O. niger' in günlük ve toplam bıraktığı yumurta sayısı, T. cinnabarinus ile beslenmesine göre önemli derece yüksek bulunmuştur. B. tabaci ile beslenen O. niger' in net üreme gücü (R0 = 87.2 Ş/Ç) ve kalıtsal üreme yeteneği (rm = 0.120 Ş/y/gün) daha yüksek, ortalama döl süresi (T0= 37.2 gün) de daha uzun olarak saptanmıştır. O. niger, artan av yoğunluğuna bağlı olarak tüketimini arttırmış ve tüketilen T. cinnabarinus yumurtalarının sayısı av yoğunlukları arasında önemli farklılık göstermiştir. Avcıya günde 150 T. cinnabarinus yumurtası verildiğinde, bunun ortalama 89,95 adedini tükettiği görülmüştür.

İki farklı av üzerinde beslenen Orius niger Wolff (Hemiptera: Anthocoridae) in yaşam çizelgeleri ve av tüketim kapasitesi

The development period, longevity, fecundity, and prey consumption of Orius niger Wolff (Hemiptera: Anthocoridae) feeding on Tetranychus cinnabarinus Boisduval (Acari: Tetranychidae) and Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) were studied in a climate room under 25±1 °C, 65±10% RH and 16 h of artificial light conditions. Feeding with different food sources did not change duration of egg, nymphal stages and total immature period for both males and females of O. niger except the third nymphal stage of males and the fifth nymphal stage of females. Oviposition period and female longevity of O. niger fed on B. tabaci were significantly longer than those of O. niger fed on T. cinnabarinus. Average total and daily fecundity of O. niger fed on B. tabaci was significantly higher than those of O. niger fed on T. cinnabarinus. The higher net reproductive rate (Rq = 87.2 y/Ş), intrinsic rate of increase (rm = 0.120 "//t / day) and the longer mean generation time (T0 = 37.2 days) of O. niger were obtained for individuals fed on B. tabaci than those of O. niger fed on T. cinnabarinus. O. niger showed increasing consumption withincreasing prey densities and, the number of T. cinnabarinus eggs consumed by O. niger significantly changed depending on prey densities. The highest number of eggs consumed by O. niger per day was 89.85 when confined to 150 eggs.

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niger on a diet of E. kuehniella eggs. The rm value of O. niger varies according to the different species of the prey offered and greater difficulty for Orius species to catch adult and nymphal stages of prey than the egg stage (Teerling, 1993; Fathi, 2009).
In conclusion, our study indicated that O. niger exhibited a high capacity for population increase when fed B. tabaci compared to T. cinnabarinus, and thus may be able to provide effective control of 8. tabaci in the field. For test this hypothesis, field experiments are needed to investigate the effect of O. niger on B. tabaci populations.
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