STUDIES ON BUGHT DISEASE AFFECTING MANGO INFLORESCENCES AND FRUITS IN EGYPT.

Abstract

Isolation procedures from inflorescences and fruits of mango produced certain fungi. The most frequently isolated and virulent fungi were F.sacchari, F.oxysporum, A.alternata and B.rhodino. There is a positive correlation between values of the maximal RH and AT in orchards and the percentage of infection. Pathogenicity tests in vitro and in vivo showed that F.sacchari, F.oxysporum, A.alternata and B.rhodina were more pathogenic to mango. Ability of fungal culture filtrates to produce disease symptoms was studied. Reaction of mango cultivar showed that Taymour is highly susceptible while Zebda is least susceptible. Optimum temperature for linear growth was 25&30°C and the optimum RH for linear growth was between 80&95%. The activity ofPME, PG and CX increase with culture filtrate age. Application with Baker's yeast, Goemar, Aluminum ferric sulphat, Topsin M70 showed that Topsin M-70 and Goemar were the best applications for disease controL Spray with foliar spray (potassium sulphate . Noshader sulphate+ copper sulphat and Goemar) decrease sharply infection. Biochemical changes in sugars, Amino acid, phenoles content and oxidative reductive enzyme activities were also studied in both healthy and artificialilly infected inflorescences and fruits of the two tested mango cultivars by the four isolasted fungi.