pplicability of some isolates and Eminent for control sugar beet cercospora leaf spot disease which cused by C.ercospora beticola was inestigated. The fungicide, Eminent was the superior in vitro treatment in suppressing growth of the pathogenic fungus. Bacillus subtilis (B1), B. subtilis (B2) and Trichoderma koningii (T1) were the most antagonistic against the pathogen. Mycelia of Cercospora beticola were in vitro partially prevented due to application of Eminent, by which its IC 50 reached 1.20 ppm. Whereas 88.12 % of the pathogenic fungus were inhibited due to Trichoderma koningii (T1). Additionally, Relative power of antibiosis (RPA) reached their maximal of 2.11 by B. subtilis (B1). Under field conditions, disease severity was reduced to 20.0 and 21.0 % by Eminent during both seasons, respectively, followed by B. subtilis (B1) and T. koningii (T1). Efficiencies of the tested Epicoccum nigrum isolates for controlling sugar beet Cercospora leaf spot disease were not as expected. The enzyme activities of Peroxidase (POX), Catalase (CAT), and Polyphenol oxidase (PPO) was increased in sugar beet to control C. beticola, and induce systemic acquired resistance. Accordingly, chlorophyll content, total soluble solids (T.S.S), sucrose % and root productivity per ton fed. -1 were also enhanced due to the use the superior control of Eminent, Trichoderma koningii (T1) and Bacillus subtilis (B1), respectively.
aize genotypes reactions against turcicum leaf blight (TLB) caused by Exserohilum turcicum showed high disease incidence in case of fertilized by fresh animal manure comparing with which fertilized by decomposing animal manure (5-6 weeks old) and control treatment (no fertilized manure). Moreover, the fertilized by fresh animal manure resulted in increased disease severity and decreased all tested yield characters and also decreased considerable grains components, indicating the complex danger of using fertilized by fresh animal manure. On the other hand, maize hybrids (SC10 and SC 176) were had suitable level of resistance to tested disease comparing with open pollinated variety (balady). The obtained results showed also that, turcicum leaf blight disease was recorded high disease severity, approximately because the climatic conditions were very suitable for development infection by TLB. Moreover, the obtained results also indicated high yield production (kg/2rows), high weight of 100 kernels, high germination %, high length of both of radical and plume cm as well as high length of plants, and high percent of grain components ( oil %, carbohydrates%, fiber%, silica , phenols, protein % ),all were obtained from plots which were fertilized by decomposing animal manure (5-6 weeks old) comparing with untreated control treatment, while, fertilized by fresh animal manure resulted in lowest values of all characters which mentioned above, with except of ash% and EC which were increased, indicating the considerable of fertilized by decomposing manure. Overall, this study recommended never use of fresh farmyard animal manure in fertilization of the soil. In the same respect, spraying of new natural substance extract which named Frankincense (Boswellia serrata) at 3000 ppm on maize plants 10 days after inoculation (45 days from sowing) resulted in decreasing of maize leaf blight disease severity and increasing of yield and their component. While, spraying by fungicide Dithane M45 was slightly high effective in decreasing diseases severity increasing yield and their components, comparing with Frankincense (Boswellia serrata) extract.
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