Pathogenicity of Entomopathogenic Fungi to Coccinella septempunctata L. (Col.: Coccinellidae) and A Survey of Fungal Diseases of Coccinellids

Yıl 2008, Cilt: 11 Sayı: 1, 118 - 122, 30.06.2008

Mehmet Kubilay Er Hasan Tunaz Ali Arda Işıkber Serdar Atar Cafer Mart Nedim Uygun

Öz

A survey to reveal naturally occurring entomopathogenic fungi on coccinellids in the East Mediterranean region of Turkey was conducted in 2004 and 2005. Beauveria and Paecilomyces species were found as pathogens of coccinellids. Fungal infection level in an overwintering site of coccinellids was significantly higher than those in the other locations. The pathogenicity of eight entomopathogenic fungi belonging to species (P. farinosus, P. fumosoroseus, B. bassiana, Lecanicillium lecanii and Metarhizium anisopliae) commonly considered as microbial control agents was investigated against Coccinella septempunctata. The experiment was conducted by
treating the adults with an appropriate conidial suspension of 105 conidia ml-1 for a period of 10 seconds. The mortality was significantly higher in all the treatments comparing with the control unit. Overall mortality within 8 days after set of experiment varied between 27 to 51% and there were statistically significant differences amongst the effects of the tested fungi. The study showed that fungal diseases are natural mortality factors in coccinellid
populations. Furthermore, it was demonstrated that not only naturally occurring fungal pathogens of coccinellids but also tested other entomopathogenic fungi isolated from non-coccinellid insect species were pathogenic to C. semptempunctata.

Anahtar Kelimeler

Deuteromycotina, Hyphomycetes, insect pathology, microbial control, natural enemy

Entomopatojen Fungusların Coccinella septempunctata L. (Col.: Coccinellidae)’ya Patojenisiteleri ve Coccinellidlerin Fungal Hastalıkları Üzerine Bir Sürvey

Öz

Coccinellidlerin doğal hastalık etmeni olan entomopatojen fungusları belirlemek üzere 2004-2005 yıllarında Türkiye’nin Doğu Akdeniz bölgesinde bir sürvey yürütülmüstür. Coccinellidlerin patojenleri olarak Beauveria ve Paecilomyces türleri saptanmıstır. Bir kıslak bölgesindeki enfeksiyon düzeyi diğer lokasyonlardan önemli derecede yüksek bulunmustur. Yaygın olarak mikrobiyal mücadele etmeni olarak ele alınan sekiz entomopatojen fungusun (P. farinosus, P. fumosoroseus, B. bassiana, Lecanicillium lecanii ve Metarhizium anisopliae) Coccinella septempunctata’ya patojeniteleri de test edilmistir. Deneme erginlerin 105 konidispor ml-1 yoğunluğundaki uygun konidispor süspansiyonuna 10 saniye süreyle maruz bırakılması ile gerçeklestirilmistir. Tüm uygulamalardaki ölüm oranları kontrol ünitesindekinden önemli derecede yüksek çıkmıstır. Sekiz gün içerisindeki ölüm oranı % 27 ile % 51 arasında gerçeklesmis olup test edilen fungusların etkileri arasında istatistiksel olarak önemli farklılıklar bulunmustur. Çalısma fungus hastalıklarının coccinellid popülasyonlarında doğal ölüm faktörleri olduğunu göstermektedir. Buna ilaveten, sonuçlar, sadece doğada görünen coccinellid patojeni fungusların değil aynı zamanda coccinellid olmayan diğer böcek türlerinden izole edilmis olan ve çalısmada test edilen diğer entomopatojen fungusların da C. septempunctata’ya pataojenik olduğunu göstermektedir.

Anahtar Kelimeler

Deuteromycotina, Hyphomycetes, böcek patolojisi, mikrobiyal mücadele, doğal düsman

Kaynakça

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