Does this look like sunburn or something else? This Comice pear is about 1.5 years old and is in full sun in a windy area. The trunk and branches look healthy, and I follow a spraying regimen for pests and diseases. It was last fed in January (balanced granular, compost, and bone meal).

I am in zone 10a, with very mild Summers (high 60's to mid 70's) and almost no frost.