Secondary or ‘rat tail’ blossoms of pears are blooms that develop from new flower buds on this years growth. Mature fruit rarely develop from these blossoms. The above image of Bartlett pear was taken in mid June. Some apples also produced Rat Tail Bloom in June this year
Flower buds for the main bloom that occurred in early May developed last summer and were on the tree through the winter.
Rat Tail bloom is important as an entry point for fire blight, a bacterial disease that is one of the most serious diseases of apples and pears worldwide. Fire blight is rare in South West BC, but it is here. For more information see this source in the BC Commercial Tree Fruit Production Guide.