Laboratuvar koşullarında spinosad, azadirachtin ve kaolinin Stephanitis pyri (Fabricius, 1775) (Hemiptera: Tingidae) üzerine etkileri

Bu çalışma doğal insektisitlerden spinosad, azadirachtin ve kaolinin Stephanitis pyri (Fabricius, 1775) (Hemiptera: Tingidae)’nin dördüncü dönem nimfleri ve erginler üzerine olan etkilerini tespit etmek amacıyla 2019 yılında Diyarbakır (Türkiye)’da yürütülmüştür. Çalışma 25 ± 1ºC sıcaklık, %65 ± 5 orantılı nem ve 16:8 (A:K) aydınlatmalı laboratuvar koşullarında yürütülmüştür. Çalışma sonucunda spinosad, azadirachtin ve kaolin uygulaması sonrası toplam ölü nimf oranı üçüncü günde sırasıyla %49, %44 ve %11; altıncı günde sırasıyla %54, %51 ve %47 olarak gerçekleşmiştir. Spinosad, azadirachtin ve kaolin uygulaması sonrası toplam ölü ergin oranı üçüncü günde sırasıyla %75, %11 ve %14; altıncı günde sırasıyla %89, %18 ve %12 olarak gerçekleşmiştir. Yaprak yüzeyinde beslenme sonrası oluşan zarar oranını ifade eden zarar indeksi nimflerde spinosad, azadirachtin ve kaolinde sırasıyla 1.25, 1.50 ve 1.50; erginlerde sırasıyla 1.00, 2.00 ve 2.00 olarak tespit edilmiştir. Beslenme sonucu bıraktıkları dışkı sayısı spinosad, azadirachtin ve kaolinde sırasıyla nimflerde 55, 98 ve 75; erginlerde 15, 98 ve 93 olarak tespit edilmiştir. Bu veriler ışığında nimf zarar indeksi hariç çalışmada incelenen bütün parametrelerde spinosad en etkili ürün olarak tespit edilmiştir. Azadirachtin ve kaolin ise nimfleri baskı altına alma açısından ön plana çıkmıştır.

Anahtar Kelimeler:

Kontrol, zarar indeksi, Diyarbakır, ölüm oranı, doğal insektisitler

Effect of spinosad, azadirachtin and kaolin on Stephanitis pyri (Fabricius, 1775) (Hemiptera: Tingidae) under laboratory conditions

This study was conducted in Diyarbakır (Turkey) in 2019 to determine the effects of natural insecticides, spinosad, azadirachtin and kaolin, on the fourth instar nymphs and adults of Stephanitis pyri (Fabricius, 1775) (Hemiptera: Tingidae). The study was conducted under the laboratory conditions; 25 ± 1ºC, 65 ± 5% humidity and 16:8 h L:D photoperiod. The mortality of nymphs 3 and 6 d after treatment with spinosad, azadirachtin and kaolin was 49, 44 and 11%, and 54, 51 and 47%, respectively. The mortality of adults 3 and 6 d after treatment with spinosad, azadirachtin and kaolin was 75, 11 and 14%, and 89, 18 and 12%, respectively. The damage index, feeding damage ratio on the upper surface of the leaf, after spinosad, azadirachtin and kaolin treatment of nymphs was 1.25, 1.50 and 1.50, and adults was 1.00, 2.00 and 2.00, respectively. After the application of spinosad, azadirachtin and kaolin, the number of droppings left by nymphs was 55, 98 and 75, and adults was 15, 98 and 93, respectively. Based these data, spinosad was determined as the most effective product in all parameters except for the fourth instar nymph damage index. However, azadirachtin and kaolin were somewhat inhibitory to nymphs.

Keywords:

Control, damage index, Diyarbakır, mortality ratio, natural insecticides,

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