The Determination of the Efficacy of some Microbial Preparations against Apple Scab Disease (Venturia Inaequalis (cke) Wint.) in Isparta

Year 2018, Volume: 1 Issue: 1, 6 - 10, 01.01.2018

Oğuzcan Çaltılı Şerife Evrim Arıcı

Abstract

The effect of Trichoderma harzianum (T-22), Bacillus subtilis (BS),
mycorrhizal preparations (Endo Roots Soluble) and combinations was investigated
against apple scap disease [Venturia inaequalis (Cke.) Wint.].
Biological preparations were applied as foliar and soil application in
different combinations. The experiment was established in gardens with a
Scarlet-Spur apple variety of 3 years old in Eg􀇍irdir. Biological
preparations were applied at 3 times in April-May 2017, taking into account the
warnings of the early warning system at the recommended doses. Dictotom blue
(Mancozeb) + Nimbus (Micobuthanil) was used as commercial fungicide. After 21
days of application, disease severity was assessed according to scale 0-4. The
results obtained according to the scale values were calculated to the % disease
severity by applying the Towsend-Heuberger formula and the% effects of the
biological preparations according to the Abbott formula. Test results were
evaluated by Tukey multiple comparison test using variance analysis with SPSS
21 statistical program. As a result, the difference between all the
applications was found significant (p<0.05). Based on the results of the
experiment, the lowest disease severity was obtained from T-22 (foliar
application) (12.2%) against Venturia inaequalis. Disease severity was
determined in the application of Dicotom blue + Nimbus (13.2%) and Mycorriza
(14.8%) respectively. The percentage of disease severity in control plants was
observed as 40.2%. In the experiment, it was determined that the highest %
efficacy values of the biological preparations were for T-22 (foliar
application) (69.65%), T-22 (foliar application) + B. subtilis (foliar
application), (67.66%) Dikotom blue+Nimbus (67.19%) and mycorrhiza (soil
application) + B. subtilis (foliar application), (64.18%) respectively.
The lowest % efficacy values of the biological preparations were determined in
the application of B. subtilis (foliar application) (48.76%), T.
harzianum (soil application) (53.23%) and T-22 (soil application) + B.
subtilis (foliar application) (58.71%). As a result, biological preparations could be used as an
alternative to chemical control, because of its positive aspects in terms of
environment and food safety.

Keywords

Mycorrhizza, Trichoderma hazrianum, Bacillus substilis, Biological control, Apple scab, , Scarlet-spur

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