Feeding Preferences of the Rearing of Thanasimus formicarius (L.) (Coleoptera, Cleridae)

Abstract

Predators have an efficient role on the control of scolytidae (Coleoptera: Curculionidae, Scolytinae) in the biological control. The most common and effective natural enemies of the scolytidae is clerid beetle. Since those natural enemies also feed from the individuals in the different development period of the scolytidae, it is effective for increasing the predation rate of the predator beetle. Besides that, the interaction and preferences between predator beetle-prey have potential importance for the efficacy of control programs. The aim of this study is to determine the feeding preferences of Thanasimus formicarius (L.) (Coleoptera, Cleridae) adults which feed from Ips sexdentatus (Boerner) (Coleoptera: Curculionidae, Scolytinae) adults and larva, quantitatively.. It is determined that the predator beetle consumed the given adult prey and its larva, respectively by the weight of 0-50,79% to 21,43-72,92% and by the feeding customs, 0-66,57% to 50-100% in a one-day period. The differences between the averages of the weights of its adult prey and its larva which the predator consumed is statistically significant and it is determined that predator beetle preferenced for the larva of the prey more than the adults. It is observed that the predations of T. formicarius adults is important on the different development periods of the species I. sexdentatus. As the pressure of the predator with accurate timing decrease the invasion rate, it will also decrease the amount of trees to be harmed. 

Keywords

• Biological control,Predator beetle,prey interactions

Thanasimus formicarius (L.) (Coleoptera, Cleridae)’un Üretilmesinde (Rearing) Beslenme Tercihi

Öz

Predatörler, biyolojik mücadelede özellikle kabuk böceklerinin (Coleoptera: Curculionidae, Scolytinae), kontrolünde etkili bir role sahiptirler. Kabuk böceklerinin en yaygın ve etkili doğal düşmanları clerid böceklerdir. Bu doğal düşmalar kabuk böceklerinin farklı gelişim dönemlerindeki bireyleriyle de beslenebildiklerinden avcı böceğin predasyon oranının artması yönünde etkilidir. Bunun yanında avcı böcek - av etkileşimleri ve tercihleri biyolojik control programlarının etkinliğinde potansiyel öneme sahiptir. Bu çalışmanın amacı sabit sıcaklık ve nem koşullarında Ips sexdentatus (Boerner) (Coleoptera: Curculionidae, Scolytinae) ergin ve larvaları ile beslenen Thanasimus formicarius (L.) (Coleoptera, Cleridae) erginlerinin beslenme tercihini nicel olarak tanımlayabilmektir. Avcı böceğin bir günlük sürede beslenmesi için verilen avının erginlerinin ve larvalarının ağırlıklarına göre sırasıyla %0-50,79 ile %21,43-72,92’sini adetlerine göre ise sırasıyla %0-66,57 ile %50-100’ünü tükettiği belirlenmiştir. Predatörün tükettiği avının ergin ve larvalarının ağırlıklarının ortalamaları arasındaki fark istatistiksel olarak anlamlı olup, avcı böceğin avının larvalarını erginlerine oranla daha fazla tercih ettiği belirlenmiştir. T. formicarius erginlerinin zararlı tür olan I. sexdentatus’un farklı gelişim dönemleri üzerindeki predasyonunun önemli olduğu görülmektedir. Doğru bir zamanlama ile predatörün oluşturabileceği baskı, istila oranını azaltabileceği gibi zarar görecek ağaç sayısını da azaltacaktır.

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