Insecticidal and Repllenet Activities of Citrus Peel Oils Against Mealybug Icerya Seychellarum (Westwod)

Abstract

ssential oils extracted from peels of five citrus fruit species namely: navel and baladi oranges (Citrus sinensis L.), grapefruit (Citrus paradisi Macfad), lemon (Citrus limon L.) and mandarin (Citrus reticulata Blanco), belonging to family Rutaceae were tested for their insecticidal and repellent activities at three different concentrations (1000, 5000, 10000ppm) against nymphs and adults of mealybug Icerya seychellarum . Also, formulated compounds, navel orange oil (1%), limonene (1%) and two recommended reference products (2% insecticidal soap and 1.5% Super Misrona), were bioassayed against mealybug I. seychellarum. The results revealed that, the oil of navel orange achieved the highest toxicity against nymphs and adults of mealybug I. seychellarum with LC 50 values of (406.97, 370.04 ppm), respectively, while, oil of mandarin recorded the lowest toxicity (LC 50 = 4148.80, 3435.99 ppm), respectively. Navel orange oil (1%) was more potent than limonene (1%) alone, while, limonene (1%) was more potent than the two reference products. Citrus species oils exhibited high repellency rate against the nymphs of I. seychellarum at the used concentrations. The highest repellency was achieved by navel orange oil, while, the lowest one was recorded with mandarin oil. The essential oils of five citrus species were isolated by hydrodistillation and the analysis of essential oil by GC/MS revealed the presence of 32 peaks, approximately all peaks were identified. The chemical composition showed that limonene was the main constituent in the five citrus oils and ranged from 67.50 to 91.20%. No phytotoxic symptoms were observed on Mango leaves treated by the citrus essential oils (Orange and baladi) and limonene. The results of the present study suggested that, orange oils (Navel and baladi) and pure limonene used as safe, potential natural products for control of I. seychellarum on Mango trees and may be used as alternatives to the reference products after application of these results in the semifield and field experiments.

Portakal Yağının Laboratuvar Koşullarında İki Noktalı Kırmızıörümcek, Tetranychus urticae Koch (Acari: Tetranychidae) Üzerine Akarisit Etkisi

“…Bitkisel ekstraktlar doğada mevcut bulunan, çevreye toksik etkisi bulunmayan, kolaylıkla parçalanabilmesi nedeniyle çevre kirliliğine yol açmayan, hedef dışı organizmalara daha az zararlı olan ve kırmızıörümceklerin mücadelesinde sentetik pestisitlere karşı son zamanlarda iyi bir alternatif olarak karşımıza çıkmaktadır (Feng ve Isman, 1995;Wewetzer, 1998;Erdoğan ve ark., 2010;Yorulmaz Salman ve ark., 2014, 2015Pavela, 2016;Kasap ve Kök, 2019). Bu ekstraktlar öldürücü (toksik), uzaklaştırıcı (repellent), beslenmeyi engelleyici (antifeedent), yumurta bırakmayı engelleyici, beslenme ve gelişmeyi engelleyici gibi zararlı üzerinde birçok biyolojik aktivite göstermektedir (Isman, 2006).…”

“…Bu biyopestisit, zararlıların kütikulalarının kurumasına neden olarak canlı dokuları yok etmektedir (Anonim, 2021). Turunçgillerden elde edilen yağların T. urticae ve diğer zararlılara karşı akarisit (Araujo-Junior ve ark., 2010;Attia ve ark., 2011), repellent (Da Camara ve ark., 2015, fumigant (Motazedian ve ark., 2012;Reddy ve Dolma, 2017) ve insektisit (Akhtar ve ark., 2012;Pavela, 2013;El-Badawy, 2015) etkileri üzerine bazı çalışmalar bulunmaktadır.…”

Impact of Silver Nanoparticles on Lemon Growth Performance: Insecticidal and Antifungal Activities of Essential Oils From Peels and Leaves

“…Compounds of limonene, β-pinene, neral, sabinene, geranial, geranyl acetate, neryl acetate, and geranyl acetate were identified in leaf EOs from C. limon ( Vekiari et al, 2002 ; Hossain et al, 2021 ). Citrus essential oils and their compounds are informed to have multifarious activities, limonene is the main constituent compound ( Mohamed and Mohamed, 2015 ; Khanikor et al, 2021 ). CEOs compounds having vital insecticidal potency tolerate all attributes to be utilized as green pesticides control of insect pests.…”