The effects of different temperatures on the biology of Rhyzobius lophanthae Blaisdell (Coleoptera: Coccinellidae)

Öz

The purple-scale predator, Rhyzobius lophanthae Blaisdell (Coleoptera: Coccinellidae), is a coccidophagous ladybug. The aim of the present study was to determine the optimal temperature for this species to be most efficient reproductively.. For that purpose, the life cycle parameters of R. lophanthae were determined at different temperatures, namely14, 16, 18, 20, 22, 24, 26, 28, 30 and 32 °C, 60% RH and long day photoperiod, with Aspidiotus nerii Bouché (Hemiptera: Diaspididae) as the prey. Calculations were performed with RmStat-3 software, based on the use of the Euler-Lotka equation. At 26, 28 and 30 °C, the intrinsic reproduction rates (rm) were 0.120, 0.142 and 0.132 females/day, respectively, and the net reproduction rates (R0) were 56.883, 80.944 and 31.149 females/generation, respectively. Mean generation times (T0) were 33.801, 30.866 and 25.978 days, respectively. Total productivity rates (GRR) were 177.779, 303.751 and 105.751 eggs/female, respectively. In this study, 28 °C was the optimal temperature for the reproductive efficiency of R. lophanthae under laboratory conditions. There is a need for further studies on the interactions between pests, predators and environmental conditions.

Anahtar Kelimeler

• Coccinellids
• Rhyzobius lophanthae
• Life table parameters
• Optimum temperature

Farklı sıcaklıkların Rhyzobius lophanthae Blaisdell (Coleoptera: Coccinellidae)’nin biyolojisi üzerindeki etkileri

Öz

Rhyzobius lophanthae Blaisdell (Coleoptera: Coccinellidae) kabuklubitlerin avcısı olarak bilinmektedir. Çalışmada türlerin daha verimli olduğu optimum sıcaklık değerinin belirlenmesi amaçlanmıştır. Bu çalışmada 14, 16, 18, 20, 22, 24, 26, 28, 30 ve 32 °C, %60 orantılı nem ve uzun gün aydınlatmalı iklim koşullarında R. lophanthae'nin yaşam çizelgesi parametreleri Euler-Lotka eşitliğine göre RmStat-3 kullanılarak hesaplanmıştır. 26, 28 ve 30 °C elde edilen sonuçlara göre Kalıtsal üreme yeteneği (rm) 0.120, 0.142, 0.132 dişi/dişi/gün olarak hesaplanırken, Net üreme gücü (R0) 56.883, 80.944, 31.149 dişi/dişi/döl olarak hesaplanmıştır. Ortalama döl süresi (T0) sırasıyla 33.801, 30.866, 25.978 gün olmuştur. Toplam üreme oranı (GRR) 177.779, 303.751, 105.751 yumurta/dişi olarak hesaplanmıştır. Çalışmada laboratuvar koşullarında R. lophanthae'nin etkinliği için 28 °C’nin optimum sıcaklık olduğu sonucuna varılmıştır. Elde edilen sonuçlara göre avcılar ve zararlıların çevresel koşullardaki etkileşimleri hakkında daha fazla çalışmaya ihtiyaç duyulduğu gözlenmiştir.

Anahtar Kelimeler

• Coccinellidler
• Rhyzobius lophanthae
• Yaşam çizelgesi parametreleri
• Optimum sıcaklıklar

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