Evaluation the efficiency of chitosan and salicylic acid in controlling gray mold disease caused by Botrytis cinerea on eggplant

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Research Paper 01/02/2019
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Evaluation the efficiency of chitosan and salicylic acid in controlling gray mold disease caused by Botrytis cinerea on eggplant

Hind Basem Hattab Al-Hadithy, Hurria Hussien Al-Juboory
J. Bio. Env. Sci.14( 2), 9-16, February 2019.
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The study was conducted to isolate and identify the causal agent of gray mold disease on eggplant and evaluate the efficiency of chitosan (CH) and salicylic acid (SA) to control the disease. The morphological characteristics proved that the causal agent of gray mold on eggplant is Botrytis cinerea . Three isolates of the pathogen, from sample showing gray mold at different location of Baghdad area, were obtained and designated as BC1, BC2, BC3. The pathogenicity tests on wounded eggplant fruits revealed that the 3 isolates were highly pathogenic. The disease severity was found to be 90.25 , 83.21 , 69.52% followed by BC2 with disease severity , 72.20 , 66.39 , 57.20 % and BC1 , 56.20 , 56.72 , 39.59 % after 14 days of inoculation on wounded fruits inoculates on upper third , lower third , and on unwounded fruits respectively. The addition of chitosan at 300 mg / L and SA at 125 mg / L separately or in combination into PDA caused high reduction in B. cinerea growth. The combination of SA + CH was the more effective with growth inhibition percentage 95.29% compared with 87.84% and 87.83% with SA and CH respectively. The application of SA and Chitosan on the plants 7 days before leaves inoculation with BC3 caused signification reduction in disease severity to 4.23% compared with 55.6% in control.


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