diseased orchid leaf inside a petri dish with black fungi botanical study chemical industry

plague isolated damaged orchidaceous fungicide background rot death disease green growth stem fungal illness damage gardening flowerpot leaf black spot flora botanical bud floral diseases orchids growing orchid spread branch phalaenopsis symptom fungus plant florist control symptoms gardener orchidaceae orchidea injury botany epidemic laboratory nursery foliaceous development morphology plate petri diseased inside dish fungi study chemical industry