Characterization of powdery mildew (Leveillula taurica) in globe artichoke (Cynara scolymus)

Year 2021, Volume: 34 Issue: 1, 17 - 24, 01.04.2021

Mehmet Aydoğdu Görkem Sülü İlker Kurbetli

https://doi.org/10.29136/mediterranean.770306

Cited By: 1

Abstract

Globe artichoke (Cynara scolymus L.) is an economically important plant that is mostly grown in Mediterranean Basin in the world. In 2016 and 2017, chlorotic spots on adaxial surface but white fungal patches abaxial surface of leaves of globe artichoke were observed in the Western Mediterranean Region of Turkey. To determine causal agent of these symptoms, leaf samples were taken sporadically in 2016, 2017 and 2020. Based on morphological and ITS sequence data, the causal agent was determined to be powdery mildew fungus Leveillula taurica (Lév.) G. Arnaud. Pathogenicity test was conducted using seedlings of globe artichoke in a greenhouse. Additionally, infections caused by the fungus were examined in a two-year field study. Several surveys were carried out according to simple random sampling method and a total of 79 farmer fields (570 da) were screened in the region. Disease incidence and prevalence of the powdery mildew in 2016 were 14.2 and 36.1%, while they were 30.1 and 53.4% in 2017, respectively. Mean disease incidence and prevalence in the both years were 22.1 and 45.5%, respectively. The disease was previously reported on globe artichoke in Italy, U.S.A., Spain and Egypt. To our knowledge, this is the first record of L. taurica causing powdery mildew on globe artichoke in Turkey and globe artichoke is a new host for L. taurica in Turkey.

Keywords

Cyanara scolymus, Leveillula taurica, characterization

Supporting Institution

General Directorate of Agricultural Research and Policies

Project Number

TAGEM-BS-15/09-10/02-10

Enginarda (Cynara scolymus) külleme (Leveillula taurica) karakterizasyonu

Abstract

Enginar dünyada çoğunlukla Akdeniz havzasında yetiştirilen ekonomik olarak önemli bir bitkidir. 2016 ve 2017 yıllarında Türkiye’de Batı Akdeniz Bölgesinde enginar bitkilerinin yapraklarının üst yüzeylerinde klorotik fakat alt yüzeylerinde beyaz fungal alanlar gözlenmiştir. Bu belirtilere neden olan etmeni tespit etmek amacıyla 2016, 2017 ve 2020 yıllarında belirli aralıklarla yaprak örnekleri alınmıştır. Morfolojik ve ITS sekans verilerine dayanarak etmenin külleme fungusu Leveillula taurica (Lév.) G. Arnaud olduğu belirlenmiştir. Patojenisite testleri enginar fideleri kullanılarak serada yürütülmüştür. Ayrıca, fungusun neden olduğu enfeksiyonlar iki yıllık bir arazi çalışması ile araştırılmıştır. Hastalık surveyleri basit tesadüfi örnekleme yöntemine göre yapılmış olup toplam 79 üretici tarlası (570 dekar) bölgede incelenmiştir. 2016 yılında hastalık oranı ve yaygınlığı sırasıyla %14.2 ve %36.1 olurken 2017 yılında bunlar sırasıyla %30.1 ve %53.4 olmuştur. Her iki yılda ortalama hastalık oranı ve yaygınlığı sırasıyla %22.1 ve %45.5 olmuştur. Hastalık daha önce İtalya, A.B.D., İspanya ve Mısır’da enginarda rapor edilmiştir. Bildiğimiz kadarıyla bu, Türkiye’ de L. taurica’nın enginarda külleme hastalığının etmeni olduğuna dair ilk kayıt ve enginar L. taurica için Türkiye’de yeni bir konukçudur.

Keywords

Cynara scolymus, Leveillula taurica, karakterizasyon

Project Number

TAGEM-BS-15/09-10/02-10

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