Insecticidal effect of diatomaceous earth formulation against Pear lace bug, Stephanitis pyri (Fabricius, 1775) (Hemiptera: Tingidae)

Öz

The pear lace bug, Stephanitis pyri (Fabricius, 1775) (Hemiptera: Tingidae), is an economically important pest of pome fruit trees. This study was conducted under controlled laboratory conditions to determine the insecticidal efficacy of Detech® WP 95 against the nymphal instars and adults of S. pyri. Experiment was carried out on apple, Malus domestica Borkh. (Rosales: Rosaceae) leaves using aqueous DE suspensions at three concentrations (2.5, 5, and 10 g/m²), and mortality was recorded daily from the first to the fifth day after treatment. 100% mortality was achieved within 24h in all treatments with 1st nymphal instars, indicating a high susceptibility of early instar nymphs to DE exposure. In the 5th nymphal instar, at a rate of 2.5 g/m², mortality increased from 70 to 100% on the third and fifth day, respectively. At 5 g/m², mortality was 80% on the second day and 100% on the third day of the treatment. Overall, mortality was positively correlated with both exposure time and DE concentration. Lethal time (LT₅₀) value for adults at the lowest concentration was 1.29 days, which was lower than that of fifth-instar nymphs (2.56 days). In conclusion, DE shows significant toxicity against S. pyri and highlights its potential as a natural insecticidal agent in integrated pest management programs.

Anahtar Kelimeler

• Detech
• IPM
• natural insecticide
• nymphal instars
• toxicity

Destekleyen Kurum

No

Proje Numarası

No

Etik Beyan

This research does not contain any studies with human participants.

Teşekkür

The authors express their sincere gratitude to Prof. Dr. Ali Arda Işıkber for providing a thorough review of the manuscript.

Armut kaplanı, Stephanitis pyri (Fabricius, 1775) (Hemiptera: Tingidae) üzerinde diatom toprağı formülasyonunun etkisi

Öz

Armut kaplanı, Stephanitis pyri (Fabricius, 1775) (Hemiptera: Tingidae), yumuşak çekirdekli meyve ağaçlarının ekonomik açıdan önemli bir zararlısıdır. Bu araştırma Detech® WP 95 preparatının S. pyri'nin 1. ve 5. dönem nimf ile ergin dönemlerine karşı öldürücü etkisini belirlemek amacıyla, kontrollü laboratuvar koşullarında 2024 yılında Tekirdağ'da yürütülmüştür. Denemeler elma, Malus domestica Borkh. (Rosales: Rosaceae) yaprakları üzerinde üç konsantrasyon düzeyinde (2.5, 5 ve 10. g/m²) sulu DE süspansiyonları ve kontrol grubu kullanılarak gerçekleştirilmiştir. Ölüm oranları uygulamadan 1-5 gün sonra değerlendirilmiştir. Birinci dönem nimfler üzerinde tüm konsantrasyonlarda yüksek etkinlik göstermiş ve 24 saat içinde %100 ölüm meydana gelmiştir. Bu durum, erken dönem nimflerin DE’ye karşı oldukça duyarlı olduğunu göstermiştir. Beşinci dönem nimflerde ise 2.5 g/m² konsantrasyonlarda ölüm oranı 3. günde %70’ten 5. günde %100’e yükselmiştir, 5 g/m² konsantrasyonlarda ise 2. günde %80 ve 3. günde %100 ölüm oranına ulaşılmıştır. Genel olarak, ölüm oranının hem maruz kalma süresi hem de DE konsantrasyonu ile pozitif korelasyon gösterdiği belirlenmiştir. Öldürücü süre (LT), en düşük konsantrasyonda erginlerin LT₅₀ değeri 1.29 gün olup beşinci dönem nimflerden (2.56 gün) daha düşük bulunmuştur. Bu sonuçlar, DE'nin S. pyri üzerinde önemli toksik etkiler gösterdiğini ve entegre zararlı yönetimi kapsamında doğal bir böcek öldürücü olarak kullanılabilme potansiyelini ortaya koymuştur.

Anahtar Kelimeler

• Detech
• IPM
• doğal böcek ilacı
• nimf evreleri
• toksisite

Destekleyen Kurum

Yok

Proje Numarası

No

Etik Beyan

Bu araştırma, insanlarla yapılan herhangi bir çalışma içermemektedir.

Teşekkür

Makaleyi kapsamlı bir şekilde değerlendiren Prof. Dr. Ali Arda Işıkber'e içten teşekkürlerimizi sunarız.

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