Determination of the efficacies of different phosphites in the management of tomato bacterial speck disease caused by Pseudomonas syringae pv. tomato

Year 2023, Volume: 28 Issue: 1, 25 - 37, 07.04.2023

Sa Ad Mohamed Haji Nour , Sümer Horuz

https://doi.org/10.37908/mkutbd.1136131

Cited By: 2

Abstract

This study tested the efficacy of five different phosphites (calcium, copper, magnesium, potassium and zinc/manganese phosphites) and a fungicide Fosetyl-Aluminum to inhibit bacterial speck disease severity caused by Pseudomonas syringae pv. tomato (Pst) on tomato leaves. The phosphites were applied at the recommended doses to the Pst inoculated plants in pots by foliar spraying at one-week intervals for a total of 4 weeks. The plants were kept in a controlled greenhouse under relative humidity (%75-90) and temperature (22-24 °C) until disease symptoms appeared in the control plants. Phosphites and Fosetyl-Aluminum inhibited the Pst symptoms on tomato leaves by 42.1-75.0% in the first and 22.8-90.3% in the second experiments. This study demonstrated the direct influence of phosphites on tomato bacterial speck. The study suggested that phosphites can be an effective alternative for the chemical control of tomato bacterial disease. The bacterial agent, Pst, causes bacterial speck disease in tomatoes. The initial symptoms of the disease are water-soaked, small dark brown spots surrounded by a yellow halo on tomato leaves. Since the pathogen is seed-borne, control of the disease is difficult.

Keywords

tomato, phosphite, Pseudomonas syringae pv. tomato, control

Supporting Institution

Erciyes University Scientific Research Projects Coordination Unit

Project Number

Grant no: FYL-2022-11632

Thanks

This study is a Master’s thesis and granted by Erciyes University Scientific Research Projects Coordination Unit (Grant no: FYL-2022-11632).

Pseudomonas syringae pv. tomato’nun neden olduğu domates bakteriyel benek hastalığının yönetiminde farklı fosfitlerin etkinliklerinin belirlenmesi

Abstract

Bu çalışmada, beş farklı fosfit (kalsiyum, bakır, magnezyum, potasyum ve çinko/mangan fosfit) ve fungisit Fosetyl-Aluminyum’un Pseudomonas syringae pv. tomato (Pst)’nun neden olduğu bakteriyel benek hastalığının domates yapraklarındaki gelişimini baskılama durumları test edilmiştir. Fosfitler saksıda bulunan Pst inokule edilmiş domates bitkilerine önerilen dozda 4 hafta boyunca haftada bir kez yapraktan püskürtme şeklinde uygulanmıştır. Bitkiler yüksek nem (%75-90) ve sıcaklıkta (22-24 °C) kontrollü serada kontrol bitkilerinde hastalık belirtileri gözleninceye kadar bekletilmiştir. Fosfitler ve Fosetyl-Aluminyum domates yapraklarında Pst belirtilerini birinci denemede %42.1-75.0, ikinci denemede ise %22.8-90.3 oranında azaltmıştır. Bu çalışma fosfitlerin domates bakteriyel benek hastalığının engellenmesi üzerine olan direk etkiyi ortaya koymuştur. Çalışma sonucunda fosfitlerin hastalığın mücadelesinde kimyasallara alternatif uygulama olarak kullanılabileceği vurgulanmıştır. Bakterial etmen, Pst, domateslerde bakteriyel benek hastalığına yol açar. Hastalığın yaprak belirtileri önceleri su emmiş, daha sonra etrafı sarı bir hale ile çevrili küçük koyu kahverengi lekeler şeklindedir. Hastalık etmeninin tohum kaynaklı olmasından dolayı hastalıkla mücadele oldukça zordur.

Keywords

Pseudomonas syringae pv. tomato, domates, fosfit, mücadele

Project Number

Grant no: FYL-2022-11632

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