Yavuz Selim ŞAHİN, Ahcen BOUHARI, İsmail Alper SUSURLUK

Hümik ve fülvik asitlerin entomopatojen nematodlar Steinernema carpocapsae (Weiser) Steinernema feltiae (Filipjev) (Rhabditida: Steinernematidae) ve Heterorhabditis bacteriophora (Poinar) (Rhabditida: Heterorhabditidae) üzerine etkileri

Hümik maddelerin (hümik ve fülvik asit) toprak yapısını iyileştirdiği ve bitki verimini artırdığı bilinmektedir. Ayrıca yapılan bazı araştırmalarda, hümik asitlerin bitki paraziti nematodlara (PPNs) karşı öldürücü etki gösterdiği belirtilmektedir. Bu çalışmadaki amaç, entomopatojen nematodlara (EPNs) karşı bu hümik maddelerin etkisini belirlemektir. Denemede %15 oranında humic ve fülvik asit içeren organik gübre ile üç farklı EPN ırkı Steinernema carpocapsae (Weiser), (Rhabditida: Steinernematidae) TURS4, Steinernema feltiae (Filipjev), (Rhabditida: Steinernematidae) TUR3 ve Heterorhabditis bacteriophora (Poinar) (Rhabditida: Heterorhabditidae) HBH kullanılmıştır. Denemede kullanılan bu EPN'ler iki farklı gübre dozuna (2 ml/l ve 5 ml/l) maruz bırakılmıştır. Deneme sonunda, hümik ve fülvik asidin bu EPN'lere karşı olumsuz bir etki göstermediği ve bu iki farklı gübre dozunun (2 ml/l ve 5 ml/l) istatistiksel olarak bu nematodlara aynı etkiye sahip olduğu da tespit edilmiştir. Ayrıca, deneme sonucuna göre; bu iki gübre dozunun H. bacteriophora HBH ve S. feltiae TUR3’ün ölüm oranını azalttığı da tespit edilmiştir.

The effects of humic and fulvic acids on the entomopathogenic nematodes, Steinernema carpocapsae (Weiser), Steinernema feltiae (Filipjev) (Rhabditida: Steinernematidae) and Heterorhabditis bacteriophora (Poinar) (Rhabditida: Heterorhabditidae)

Humic substances (humic and fulvic acids) are known to improve soil structureand plant yield. It has also been reported that humic acids have a nematicidal effect againstplant parasitic nematodes (PPNs). The aim of this study was to determine the effect of thehumic substances on entomopathogenic nematodes (EPNs). Three different species of EPN,Steinernema carpocapsae (Weiser), (Rhabditida: Steinernematidae) TURS4, Steinernemafeltiae (Filipjev), (Rhabditida: Steinernematidae) TUR3 and Heterorhabditis bacteriophora(Poinar) (Rhabditida: Heterorhabditidae) HBH, and an organic fertilizer that contained 15%humic and fulvic acid, were used in this experiment. The EPNs were exposed to two differentdoses (2 ml/l and 5 ml/l) of the fertilizer. The EPNs were not negatively affected by humicand fulvic acids. In addition, it was determined that the effect of the two different doses onthe three species was not significantly different. Moreover, both doses of the fertilizersdecreased the mortalities of H. bacteriophora HBH and S. feltiae TUR3.

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