标题：THE INFLUENCE OF NANO-COPPER AND SAFETY
COMPOUNDS ON VEGETATIVE GROWTH YIELD AND
FRUIT OUALITY OF "LE CONTE" PEAR TREES UNDER
INFECTION WITH FIRE BLIGHT
摘要：Fire blight is the most thoughtful diseases that effects great damage of pome fruits trees particularly pears in Egypt and over world. The causal agent of fire blight is Erwinia amylovora, the Gram-negative bacteria, a disturbing disease troubling species ofthe family Rosaceae. In this study two extracts were ap- plied which were Hibiscus extract and pomegranate peel extract. Also, Nano cu, oxolinic acid (starner 20%) were evaluated on susceptible pear cultivar (Le-conte pear trees budded on Pyrus communis) and compared with the outcome of streptomycin as standard antibiotic in green house and under fielo conditions. Under greenhouse disease symptoms and severity of inoculated pear seedlings and treated withplant extracts, nano copper (cu), starner and strepto- mycin showed significant inhibition and decrease as compared with the control infected only. Under field conditions and natural infection, as a result of using with hibiscus extract, pomegranate peel, nano cop- per(cu), starner and streptomycin, disease severity, disease symptoms and electrolyte leakage % were decreased significantly. Consequently, that the vege-tative growth such as chlorophyll content, efficiency of photosynthesis, shoot length and diameter were significantly increased with all treatments. Fruit set, yield and quality were improved compared to the control.
