Determination of the entomopathogenic potential of some Turkish fungal isolates in the control of Bemisia tabaci (Genn.) (Hemiptera: Aleyrodidae)

Öz

The cotton whitefly, Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae), is among the most important pests causing financial losses in agriculture. Due to its bio-ecological characteristics and resistance to insecticides, its control is getting more difficult. In this study, the entomopathogenic characteristics of Cladosporium xantochromaticum, Fusarium chlamydosporum and Penicillium oxalicum isolates from B. tabaci were determined under laboratory conditions for their potential use in the biological control of the pest . The P. oxalicum isolate had efficacies of 65% and 30% against the nymphal and adult stages of the pest, respectively. This isolate was followed by the C. xantochromaticum isolate with 48% and 31%, respectively. The mentioned isolates also prolonged the immature development period of B. tabaci. Two promising isolates (P. oxalicum and C. xantochromaticum) that can potentially contribute to the biological control of B. tabaci were identified in this study. It is expected that integrating these isolates with predators and parasitoids would increase the success of biological control programs of the pest.

Anahtar Kelimeler

• Bemisia tabaci
• entomopathogen fungus
• Cladosporium xantochromaticum
• Fusarium chlamydosporum
• Penicillium oxalicum

Bemisia tabaci (Genn.) (Hemiptera: Aleyrodidae)’nin biyolojik mücadelesinde bazı yerel fungus izolatlarının entomopatojenik potansiyellerinin belirlenmesi

Öz

Pamuk beyazsineği Bemisia tabaci (Gennadius) (Hemiptera: Aleyrodidae) tarımsal üretimlerde ekonomik kayıplara neden olan en önemli zararlılar arasında yer almaktadır. Gerek biyo-ekolojik özellikleri gerekse insektisitlere karşı geliştirdiği direnç nedeniyle mücadelesi giderek zorlaşmaktadır. Bu çalışmada zararlının biyolojik mücadelesinde kullanılabilecek B. tabaci’den izole edilmiş Cladosporium xantochromaticum, Fusarium chlamydosporum ve Penicillium oxalicum izolatlarının entomopatojenik özellikleri laboratuvar koşullarında belirlenmiştir. Çalışmada, P. oxalicum izolatı zararlının nimf ve ergin dönemine karşı sırasıyla %65 ve %30 oranlarında etki göstermiştir. Bu izolatı aynı sırayla %48 ve %31 oranlarıyla C. xantochromaticum izolatı izlemiştir. Belirtilen izolatlar aynı zamanda zararlının ergin öncesi gelişme sürelerinin uzamasına da neden olmuştur. Çalışmada B. tabaci’nin biyolojik mücadelesine katkı sunabilecek ümitvar iki izolat (P. oxalicum ve C. xantochromaticum) saptanmıştır. Bu izolatların, avcı ve parazitoitler ile entegre edilmesinin zararlıya karşı yürütülecek biyolojik mücadele uygulamalarının başarısını arttıracağı düşünülmektedir.

Anahtar Kelimeler

• Bemisia tabaci
• entomopatojen fungus
• Cladosporium xantochromaticum
• Fusarium chlamydosporum
• Penicillium oxalicum

Kaynakça

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