noun
also pear tree psylla
: a yellowish or greenish jumping plant louse ( Psylla pyricola ) that is often destructive to the pear — called also pear louse
noun
also pear tree psylla
: a yellowish or greenish jumping plant louse ( Psylla pyricola ) that is often destructive to the pear — called also pear louse
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012