تقويم كفاءة تراكيز مختلفة من منظم النمو حامض السالساليك في استحثاث مقاومة نبات الخيار Cucumis sativus ضد الفطر Sclerotinia sclerotiorum و مقارنتها بالمبيد Bastin

الملخص EN

The study aimed to evaluate the efficiency of different concentrations of Salicylic acid in the induction of resistance of Cucumis sativus L.

plant against fungus Sclerotinia sclerotiorumin compared with the fungicide (Bastin).

The results of laboratory experiments had proved that the Salicylic acid had a considerable influence in the inhibition of pathogenic fungus S.

sclerotiorum at the lowest concentration, where as the percentage of inhibition was 95.13 % at a concentration 0.05 mg.

L-1 .

Also the results showed an increasing in plant growth indicator after 90 days.

The fresh and dry weight of vegetation and root shoot and leaf area were increased to 93.80 , 25.77 , 22.50 , 3.86 g , 159.5 cm2 respectively compared with the control treatment which were 58.03 , 19.97 , 16.23 , 2.68 gm , 136.4 cm2 respectively.

After 30 days from cultivation,Salicylic acid treatments with fungicide increased of the fresh weight of vegetation and root system and dry weight of root system which reach 14.18 , 4.75 , 0.35g compared with the control, which amounted 7.42 , 1.16 , 0.05 g , respectively.