roted pear by a plant pathogen

acervul agent agricultural agriculture agronomy attacked brown browning causing conidia conidium danger destruction deterioration disease diseased food fructification fruit fungi grape harvest health healthcare healthy infected infection inoculated intoxicate intoxication juice medical medicine mycelium natural nature pathogen pathology pear phytopathogen phytopathology plant postharvest produce product production pycnid pycnidia pycnidium quality research risk rot roting science security showing sign sound spores symptom symptoms syndrome toxin toxins vignard white