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lternaria solani (Ellis and Martin) Jones and Grout, the causal of tomato early blight, attacks all tomato hybrids and varieties, either in open field or in greenhouse, causing a serious damage that led to decrease in tomato yield. The fungus A. solani was isolated from tomato leaves and fruits, showing typical symptoms of early blight, collected from different locations distributed in six Egyptian Governorates. Pathological studies cleared that A. solani isolate taken from Menufiya was the most aggressive one; meanwhile, Ismailiya isolate was the lowest one in this concern. Disease control experiments revealed that all the tested fungicides inhibited, to different degrees, the in vitro growth of A. solani and decreased early blight severity under greenhouse conditions. The contact fungicides were more effective than the systematic ones, in controlling tomato early blight. Moreover, mancozeb 64% + metalaxyl 4% and copper hydroxide were the most effective ones, followed by systematic fungicides shirlan and dolphin Alfa.

Efficiency of fungicides; Shirlan 50% SC, Ranman 40% SC, Revus 25% SC, Leimay 20% SC, Vegeclean 15% WG and Evito 48% SC against tomato late blight disease was conducted In vitro and In vivo tests. The variation in the aggressiveness of the two isolates of P. infestans could be clearly differentiated to most aggressive one (PhK-2) and least aggressive (PhK-1). Medium effective concentrations (EC 50) of the candidate fungicides indicated that Shirlan 50% SC was the superior fungicides against mycelial growth of PhK-1 and PhK-2 isolates. Revus 25% SC and Ranman 40% SC were less efficiency against mycelial growth of PhK-1 and PhK-2 isolates, respectively. The tested fungicides gave excellent control of tomato late blight disease under greenhouse conditions especially Evito 48% SC and vegeclean 15% WG when applied as protective or curative. The candidate fungicides were used separately at their recommended rates of application against late blight disease on tomato plants during the season of 2015-2016 in two different locations (Fayoum and Sharkia Governorates). In Sharkia Governorate, all the candidate fungicides gave excellent control of late blight disease, which their efficiency ranged between 80.03 and 85.93% except Revus 25% SC gave 63.67% only. Efficiency of Leimay 20% SC and Shirlan fungicides against late blight disease was increased from 63.73 and 65.61% in Fayoum trial to 80.03 and 80.69% in Sharkia trial, respectively. Efficacy percentages of tested fungicides were highly correlated with area under the disease progress curve (AUDPC) values. All candidate fungicides when treated as curative were effective in controlling late blight disease except Revus 25% SC.

Efficiency of fungicides; Teldor 50%SC, Nowton 50% SC, Toledo 43% EC, Kenzo 50% WG and Suntop El-nasr 70% WP against tomato gray mold disease was conducted In vitro tests. The sensitivity of Botrytis cinerea isolates to tested fungicides differed significantly according to their aggressiveness. The lowest pathogenicity isolate BcI-3 ranked as the most susceptible isolate, while the highest pathogenicity isolate BcB-2 was the least susceptible isolate to the tested fungicides. Medium effective concentrations (EC 50) of the tested fungicides indicated that Teldor 50%SC was the superior fungicides against mycelial growth of the all tested isolates, while Suntop El-nasr 70% WP was the inferior one. The EC 50 values of the tested fungicides for mycelial growth of the least aggressive isolate (BcI-3) were less than that of the other tested isolates. Under greenhouse condition, all tested fungicides were control gray mold disease on tomato. Data revealed that when tested fungicides treated as curative or protective, were effective in reducing the disease severity of gray mold produced from the most and least aggressive isolates. Tested fungicides Teldor 50% SC and Toledo 43% EC gave excellent control of gray mold disease when applied as protective or curative. All tested fungicides, expect Suntop El-nasr 70% WP, were effective in controlling gray mold as curative treatement.

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