Definition of white tip
1 : a disease of leeks especially in Britain caused by a fungus (Phytophthora porri) and characterized by yellowing and dieback of the leaf tips which finally turn white
2 : any of several diseases of cereal grasses (as maize) and other crop plants caused by mineral deficiencies and resembling fungal white tip in symptoms
3 : a disease of rice caused by a nematode (Aphelenchoides oryzae) and characterized by whitening of the leaf tips
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