Depolanmış çeltikte pirinç biti, Sitophilus oryzae L., 1763 (Coleoptera: Curculionidae)’nin mücadelesinde diyatom toprağı formülasyonlarının değerlendirilmesi

Bu çalışma 2012-2014 yılları arasında laboratuvar koşullarında yürütülmüştür. Bu çalışma ile diyatom toprağı (DT) formülasyonlarının, önemli bir depo zararlısı olan Sitophilus oryzae L., 1763 (Coleoptera: Curculionidae) (Pirinç biti)’ye karşı depolanmış çeltikte koruyucu etkisi araştırılmıştır. Çalışmalar 30°C sıcaklık ve %75 orantılı nemde, DT uygulanmış çeltikte yürütülmüştür. Denemelerde Protector® (DT formülasyonu) ve DEA-P (DT ile abemectin karışım formülasyonu) formülasyonlarının farklı konsantrasyonları kullanılmıştır. Çalışmalarda DT uygulamasının ardından birer hafta ara ile 4 kez ölü ergin birey sayımı yapılmış ve ölüm oranları belirlenmiştir. Ayrıca S. oryzae’nin F1 çıkışını (birinci nesil erginleri) belirlemek amacı ile çeltik tekrar aynı koşullarda 60 gün süre ile bekletilerek yeni nesil ergin sayıları hesaplanmıştır. Protector®, S. oryzae erginlerinde 1000 ppm konsantrasyonunda 14. günde %100 ölüm sağlarken DEA-P aynı ölüm oranını 75 ppm konsantrasyonda aynı sürede sağlamıştır. F1 çıkışlarını belirlemek için yapılan çalışmalarda ise Protector® 60 günlük depolama süresi sonunda 1750 ppm konsantrasyonda %100 etkili olurken, DEA-P ise 50 ppm konsantrasyonda %100 ölüme neden olmuştur. Sonuçlar değerlendirildiğinde, her iki diyatom toprağı formülasyonunun ürünü koruyucu etkisinin olduğu, ancak DEA-P’ nin S. oryzae’ye karşı Protector®’unkilerden daha düşük konsantrasyonlarda etkili olduğu saptanmıştır.

Anahtar Kelimeler:

Diyatom toprağı, fiziksel mücadele, Sitophilus oryzae, depolanmış çeltik

Evaluation of diatomaceous earth formulations for the control of rice weevil, Sitophilus oryzae L., 1763 (Coleoptera: Curculionidae) in stored rice

A study was conducted between 2012 and 2014 on the protective efficacy of diatomaceous earth (DE) formulations against Sitophilus oryzae L., 1763 (Coleoptera: Curculionidae) (rice weevil), a major pest of the stored rice. Biological tests were carried out at 30°C and 75% RH on rice treated with DE formulations. In the biological tests, different concentrations of Protector® (DE formulation) and DEA-P [mixture of natural DE (83%) and 0.25% abamectin (w:w)] were used. After DE treatment, dead adults were counted once a week for a month and percentage mortalities were determined. In order to determine progeny production (F1), rice was also incubated under the same conditions for a 60-day period. Protector® gave 100% mortality to S. oryzae adults at 1000 ppm after 14 d, and DEA-P gave the same mortality rate at 75 ppm at the same time. In studies to determine progeny (F1) emergence, Protector® resulted in 100% mortality at 1750 ppm after 60 d of storage, while DEA-P caused 100% mortality at 50 ppm concentration. In conclusion, the protective effect of both DE formulations was confirmed, however DEA-P was more effective against S. oryzae at lower concentrations than Protector®.

Keywords:

Diatomaceous earth, physical control, Sitophilus oryzae, stored rice,

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