Prevention of arterial hypertension. Introduction.

Abstract

Root rot and wilt caused by Rhizoctonia solani, Fusarium solani and F. oxysporum is the most destructive diseases of tomato plants. Effect of some chemical inducers viz. ethephon, hydrogen peroxide (H2O2), mannitol, salicylic acid (SA) at three different concentrations (50,100, 200 ppm) on root rot and wilt diseases incidence as well as their influence on growth, quantity and quality parameters of tomato plants (cv. Super Strain B) when used as seedling soaking under greenhouse and field conditions were studied. All the tested chemical inducers significantly reduced root rot and wilt diseases severity either under greenhouse or field conditions. The efficiency of these compounds increased by increasing concentrations. Mannitol was the most effective inducer for decreasing area under disease progress carve (AUDPC) followed by salicylic acid, while ethephon recoded the lowest reduction ones. Also, under laboratory conditions, all tested chemical inducers were significantly reduced mycelial linear growth of all tomato root rot and wilt tested fungi compared with control. The highest decrease in linear growth was noticed with ethephon at concentration 200 followed by SA at 200 ppm. On the other hand, F. solani more affected with chemical inducers than F. oxysporum or R. solani. Under field conditions, the treatments were accompanied with significant increase in tomato growth, yield quantity and quality parameters. Application of mannitol at 200 ppm followed by SA at 200 was the most potent in all growth, quantity and some quality parameters compared with check treatment.