RANA AKYAZI, YUNUS EMRE ALTUNÇ, METE SOYSAL

Amblyseius swirskii ve Neoseiulus californicus (Mesostigmata: Phytoseiidae)’un Tüketim Kapasitesine Avın Yumurta Yaşının Etkisi

Amblyseius swirskii Athias-Henriot ve Neoseiulus californicus (McGregor) (Mesostigmata: Phytoseiidae)’un tüketim kapasitesine, Tetranychus urticae Koch (Prostigmata: Tetranychidae)’ nin yumurta yaşının etkisi, kontrollü koşullar altında araştırılmıştır. Bu amaçla, av olarak T. urticae’nin 0-24, 24-48 ve 48-72 saatlik olmak üzere 3 farklı yaştaki yumurtaları kullanılmıştır. Deneyler, N. californicus ve A. swirskii (2-3 günkük)’ nin deneme öncesi 24 saat açlığa maruz bırakılmış ve tok olan döllenmiş ergin dişi bireyleri kullanılarak yürütülmüştür. Her predatör akar, üzerinde 30 adet T. urticae yumurtası bulunan fasulye yaprak diskleri üzerine, bireysel olarak yerleştirilmişlerdir. 24 saat sonra predatör akarlar diskler üzerinden uzaklaştırılarak, tüketilen yumurta sayıları kaydedilmiştir. Deneyler 2 cm çaplı fasulye yaprak diskleri kullanılarak, 25°C ± 1, 65 ± 5% nisbi nem ve 16A:8K (Aydınlık: Karanlık) aydınlanma koşullarında yürütülmüştür. Sonuçlar, N. californicus ve A. swirskii’nin tüketim kapasitelerinin T. urticae’nin yumurta yaşından etkilendiğini göstermiştir. Açlığa maruz bırakılmış N. californicus ve A. swirskii bireylerinin, yaşlı T. urticae yumurtalarını, genç olanlara göre daha fazla tükettikleri de belirlenmiştir. Ayrıca, açlığa maruz bırakılan predatör akarların tüketim miktarlarının önemli derecede arttığı da tespit edilmiştir. Fakat ileriki çalışmalarda, yumurta yaşının predatör akarların besin tercihi, üreme kapasitesi ve ömürleri üzerine etkileri de araştırılmalıdır.

Anahtar Kelimeler:

Predatory mite, starvation, consumption, egg age, twospotted spider mite, biological control.

Influence of Prey Egg Age on The Consumption Capacity of Amblyseius swirskii and Neoseiulus californicus (Acari: Mesostigmata: Phytoseiidae)

The influence of egg age of Tetranychus urticae Koch (Prostigmata: Tetranychidae) on consumption capacity of Amblyseius swirskii Athias-Henriot and Neoseiulus californicus (McGregor) (Mesostigmata: Phytoseiidae) were evaluated under controlled conditions. To determine the effect of egg age on the predator's consumption rate, three different groups of T. urticae egg, 0-24, 24-48 and 48-72 hour-old, were offered as prey. All experiments were performed using unstarved and starved (24 hours) mated female adults of N. californicus and A. swirskii (2-3 day old). Each predatory mite was individually placed on each leaf disc containing 30 T. urticae eggs. After 24 hours of exposure, the predatory mites were removed and the number of consumed eggs was recorded for each treatment. All experiments were carried out on bean leaf discs (2 cm in diameter) at 25°C ± 1, 65 ± 5% R.H. and a photoperiod of 16 Light:8 Dark. The result showed that the consumption capacities of N. californicus and A. swirskii were influenced by eggs age of T. urticae. The amounts of older T. urticae eggs consumed by starved N. californicus and A. swirskii were higher than younger eggs'. The prey consumption was also significantly higher than when predators were deprived for prey for 24 h on a leaf. However, the effect of host egg age on the preference, fecundity and longevity of the predatory mites should also be needed further studies.

Keywords:

Predatory mite, starvation, consumption, egg age, twospotted spider mite, biological control.,

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