Bazı Kekik Türlerine Ait Uçucu Yağların Çam Kese Tırtılı [Thaumetopoea pityocampa (Lepidoptera: Notodontidae)]’na Karşı Toksisitesinin Belirlenmesi

Türkiye’de orman alanlarında önemli orman zararlılarından biri olan Thaumetopoea pityocampa (Lepidoptera: Notodontidae) özellikle çam ağaçlarında ciddi zararlara neden olmaktadır. Ülkemizde orman alanlarında bu zararlının mücadelesinde mekanik ve kimyasal mücadele yapılmaktadır. Son yıllarda bu zararlıya karşı kimyasal mücadele en çok tercih edilen yöntemdir. Fakat kimyasal mücadelenin çevre ve insan sağlığına olan zararlı etkilerinden dolayı günümüzde alternative mücadele yöntemleri ön plana çıkmaktadır. Tarımsal alanlarında zararlılara karşı bitkisel yağların kullanımı ile ilgili birçok çalışma bulunmaktadır. Ancak çam kese böceğine karşı bitkisel yağların etkisi üzerine yapılmış çalışmalar oldukça sınırlıdır. Bu çalışmada beş farklı kekik türüne ait uçucu yağların (Origanum majorona, O. multiflorum, O. saccatum, Thymus cillilus, T. spicata) üçfarklı dozu (%0,1, %0,5 ve %1) dört tekerrürlü olarak çam kese tırtılının larvalarına uygulanmıştır. Denemeler %70 nem ve 20±2oC laboratuvar şartlarında yürütülmüştür. Çalışma beş gün takip edilmiş ve sonuçlar yüzde ölüm oranı üzerinden değerlendirilmiştir. Tüm yağların %1 dozu değerlendirildiği zaman en yüksek ölüm oranı T. cilicus ‘da %95 belirlenmiştir. Diğer türlerde ise sırasıyla O. saccatum (%90), T. spicata ve O. multiflorum (%80) ve O. majorona (%75) olarak bulunmuştur.

Anahtar Kelimeler:

Kekik türleri, Çam, Zehirlilik, Bazı uçucu yağlar

Determining the Toxicity of Some Thyme Essential Oils Against the Pine Processionary [Thaumetopoea pityocampa (Lepidoptera: Notodontidae)]

One of the major forest pests in Turkey, Thaumetopoea pityocampa (Lepidoptera: Notodontidae), causes serious damage in pine trees. Mechanical and chemical control tactics are applied for management of this pest in forest areas where the chemical control is mostly preferred. However, due to its adverse effects of chemicals on the environment and human health, alternative control methods have gained importance. In this study, three different doses (0,1%, 0,5% and 1%) of each of five different thyme essential oils (Origanum majorona, O. multiflorum, O. saccatum, Thymus cilicus, T. spicata) were applied to the larvae of the pine processionary in four replications. When the 1% dose of all oils were assessed, the highest mortality rate was observed in T. cilicus with 95%, followed by O. saccatum (90%), T. spicata and O. multiflorum (80%) and O. majorona (75%). As a result of the study, it was seen that the application of essential oils is effective even at low doses, and the effect increases along with the respective doses. This study revealed that thyme oil could be used as a bio insecticide in the control of T. pityocampa in forests.

Keywords:

Thyme species, Pine, Toxicity, Some essential oils,

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