تأثير بعض عوامل الاستحاثة الكيميائية و الإحيائية في خفض إصابة نبات الطماطا بالفطر Fusarium oxysporum schl. f.sp.lycopersici

Abstract EN

This study was aimed to evaluate the affectivity of some chemical and biological factors (the fungicide Esla, copper, and salicylic acid) and the bacteria Pseudomonas fluorescens pf.

DS singularly or collectively in reduce infection of plant tomato by disease Fusarium wilt disease caused by Fusarium oxysporum Schl f.sp lycopersici.The results showed that P.

fluorescens and the bacterial filtered treated and untreated with heat have a high antagonistic ability in inhibition growth of F.o.l.

in the culture where inhibition zone reached 3,3 and 2.4 cm respectively.

The results also showed that fungicide Elsa inhibition the growth of the infections fungus F.o.l completely reaching 100% rate in all concentration tested 10-50 ppm.

Copper and salicylic acid showed no effect on the fungus growth at low concentration , whereas high concetration inhibted the fungus growth.

The treatment with ( P.

fluorescens + salicylic acid + CuSO4 H2O + F.o.l ) achieves the least infection rate in the green house and the field.

The chemical factors induce resistance and P.

fluorescens cause an increase in some parameters of the shoot growth as the dry wieght of shoot and root system and N.

P.

K .