Kubilay Kurtuluş BAŞTAŞ, Salih MADEN, Y. Zekai KATIRCIOĞLU, Nuh BOYRAZ

Determination of application time for chemical control of fire blight disease in pear varieties

Erwinia amylovora’ nın sebep olduğu ateş yanıklığı, armut, elma ve diğer Rosaceae familyası bitkilerinin ciddi birhastalığıdır. Bu çalışmada, ateş yanıklığı hastalığına karşı, yetiştirme sezonu içerisinde korunmanın devamlılığı vesürgün gelişimi bakımından, geleneksel ürünlere, streptomisin, bakır ve maneb+bakır, alternatif olarak konukçudayanıklılığını teşvik edicilerin, harpin protein, benzothiadiazole, prohexadione-Ca etkililiği ve uygulama zamanlarıhassas armut çeşitlerinde, sera ve arazi koşullarında değerlendirilmiştir. Tip 1 ve Tip 2 uygulamaları hastalığınengellenmesi, Tip 3 ve Tip 4 uygulamaları sürgün gelişimi değerlendirilmesi için yapılmıştır. Harpin proteinin Tip 2uygulaması hastalığın önlenmesinde sırasıyla sera ve arazide %49 ve %65 oranlarında dikkate değer etkililik vermiştir.Prohexadione-Ca ve benzothiadiazole ile Tip 1 ve Tip 2 uygulamalarından sonra, hastalık şiddeti bakır, maneb+bakıruygulamalarına ve kontrollere kıyasla önemli ölçüde azalmıştır. Sürgün uzunluklarını sadece prohexadione-Cauygulamaları önemli olarak azaltmış ve bitkiler, bu kimyasalın Tip 4 uygulamasından büyük ölçüde etkilenmişlerdir.Elde edilen bulgulara göre, tüm armut çeşitlerinde, sera ve arazi koşullarında Tip 2 uygulamaları, Tip 1’den daha iyisonuçlar sağlamıştır ve ateş yanıklığı hastalığının sürgün yanıklığı evresi kontrolünde, dayanıklılığı teşvik edenkimyasalların kullanımı önerilmektedir.

Armut çeşitlerinde ateş yanıklığı hastalığının kimyasalmücadelesinde uygulama zamanının belirlenmesi

Fire blight, caused by the bacterium Erwinia amylovora, is a serious disease of pear, apple, and other plants of theRosaceae family. In this study, from the point of view of continuousness of protection of fire blight disease andshoot growth in growing season, application times and effectiveness of host resistance inducers, harpin protein,benzothiadiazole, prohexadione-Ca as alternatives to conventional products, streptomycin, copper andmaneb+copper were evaluated on susceptible pear varieties in greenhouse and field conditions. Type 1 and Type 2applications for prevention of the disease and Type 3 and Type 4 applications for evaluation of shoot growth wereperformed. Type 2 application of harpin protein gave remarkable effectiveness on prevention of the disease about49% and 65% in greenhouse and field, respectively. After Type 1 and 2 applications by prohexadione-Ca andbenzothiadiazole, disease severity significantly decreased comparing to applications of copper and maneb+copperand, controls. Only prohexadione-Ca applications significantly reduced shoot lengths and plants were highly affectedby the application Type 4 of this chemical. According to findings, applications of Type 2 provided better results thanType 1 on all of pear varieties in greenhouse and field conditions and use of resistance inducing substances duringthe production season is proposed in managing of shoot blight phase of fire blight disease.

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