The effectiveness of some rhizobacteria on Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949 (Nematoda: Meloidogynidae) in cucumber plants

Abstract

In this study, the possibilities of using 3 specific rhizobacteria isolates for the control of Meloidogyne incognita (Kofoid & White, 1919) Chitwood, 1949 (Nematoda: Meloidogynidae) in cucumber plants of Beith alpha cultivar were investigated in 2023. The variables of the climate chamber experiment were seedling and seed treatments of the specific bacterial isolates and the QST713 (Serenade®) commercial isolate, nematode (1500 J2/pot) and non-nematode treatments, as well as positive and negative control treatments. As a result of the study, when the rate of root galling on cucumber roots was determined according to the Zeck scale, the most successful treatment in decreasing root galling was the seedling treatment of KD29 isolate (2.64), while the highest rate of root galling was observed in the positive control (6.27). When the bacterial treatments were compared with the positive control, it was observed that all bacterial treatments had a decreasing effect on the number of egg mass. When the effects of the treatments on the reproduction rate of the J2 population were analyzed, it was found that seedling treatments of isolate KD238 (0.69) and commercial isolate QST713 (0.86) had a decreasing effect on the J2 reproduction rate in the soil. As a result of the laboratory experiment, it was determined that KD157, KD238 and KD29 isolates had 42.25, 33.98 and 27.77% mortality effect on J2s after 96 hours, respectively. However, especially considering the decrease in the J2 population in the soil, the amount of root growth and the decrease in the number of egg mass, these bacteria stimulate the induced systemic resistance (ISR).