Insecticidal efficacy of local diatomaceous earths against adult and larvae of Tenebrio molitor L., 1758 (Coleoptera: Tenebrionidae)

Abstract

In this study, insecticidal activity of diatomaceous earths (DE) of different particle size (Turco 000, 004 and 020) obtained from domestic sources in Turkey were tested against Tenebrio molitor L., 1758 (Coleoptera: Tenebrionidae) larvae and adults under laboratory conditions. DE were tested against larvae and adults of T. molitor at four different rates (0, 0.001, 0.002, 0.003 and 0.004 mg/cm²), and LC₅₀ and LC₉₀ values were calculated. Turco 000 grade DE with the smallest particle size had 100% efficacy at all rates against the adults at 60 h, and after 48 h, LC₅₀ and LC₉₀ values were 0.006 and 0.019 g/cm², respectively. After 48 h treatment, the LC₅₀ and LC₉₀ values for Turco 004 were 0.013 and 0.022 g/cm², respectively, whereas they were 0.022 and 0.041 g/cm² with Turco 020, respectively. The DE applied to the larvae had activity in varying proportions. LC₅₀ values were 0.014, 0.034 and 0.032 g/cm² after 72 h for Turco 000, 004 and 020 , respectively. LC₉₀ values were 0.053, 0.089 and 0.075 g/cm², respectively. The results obtained in this study are promising for control of this pest with local DE.

Keywords

• Lethal toxicity,diatomaceous earth,particle size,Tenebrio molitor

Yerli diyatom topraklarının Tenebrio molitor L., 1758 (Coleoptera: Tenebrionidae)’ün ergin ve larvalarına karşı insektisidal etkinliği

Abstract

Bu çalışmada Türkiye’de yerli kaynaklardan elde edilen farklı tanecik boyutuna sahip diyatom topraklarının (Turco 000, 004 ve Turco 020) Tenebrio molitor L., 1758 (Coleoptera: Tenebrionidae) larva ve erginlerine karşı insektisidal etkinliği laboratuvar koşullarında test edilmiştir. Bu amaçla diyatom toprakları dört farklı dozda (0.001, 0.002, 0.003 ve 0.004 g/cm²) zararlının larva ve erginlerine karşı denenmiş, LC₅₀ ve LC₉₀ değerleri hesaplanmıştır. En küçük parçacık boyutuna sahip Turco 000 kodlu diyatom toprağı zararlının erginlerine karşı 60. saat uygulama yapılan dozlarda %100 ölüme neden olmuş ve 48. saat sonunda LC₅₀ ve LC₉₀ değerleri sırasıyla 0.006 ve 0.019 g/cm²olarak hesaplanmıştır. 48 saatlik uygulama süresi sonunda Turco 004 için LC₅₀ ve LC₉₀ değerleri sırasıyla 0.013 g/cm², 0.022g/cm² olarak hesaplanmıştır. Aynı zaman dilimi içerisinde Turco 020 kodlu diyatom toprağı için LC₅₀ ve LC₉₀ değerleri ise sırasıyla 0.022 ve 0.041 g/cm² olmuştur. Zararlının larvaları için uygulama yapılan diyatom toprakları değişen oranlarda aktiviteye sahip olmuştur. Turco 000, 004 ve 020 kodlu diyatom toprakları için 72. saat sonunda LC₅₀ değerleri sırasıyla 0.014, 0.034 ve 0.032 g/cm² olarak hesaplanırken LC₉₀ değerleri sırasıyla 0.053, 0.089 ve 0.075 g/cm² olarak hesaplanmıştır. Bu çalışmada elde edilen sonuçlar yerel diyatom topraklarının bu zararlının mücadelesinde kullanımı açısından ümit var sonuçlar içermektedir.

Keywords

• Letal toksisite,yerel diatom toprağı,tanecik büyüklüğü,Tenebrio molitor

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