what happened to my Honeycrisp apples?
Mason County Washington
Let’s tackle the easy question first. For a pollinizer, you have to make sure that the two varieties bloom at the same time. Here’s a chart for bloom times. http://s3-us-west-2.amazonaws.com/treefruit.wsu.edu/wp-content/uploads/2015/01/W-D_Apple-bloom-chart.png
Here’s a chart that shows the compatible pollinizer varieties: http://s3-us-west-2.amazonaws.com/treefruit.wsu.edu/wp-content/uploads/2015/01/12082434/Apple-pollen-chart_ed.png
Now for the more complicated questions. Your apples appear to be infested with Apple Maggot. All of western Washington is under a permanent apple maggot quarantine in hopes that it won’t spread east of the cascades and the commercial apple growers there. There is a prohibition on transporting fresh homegrown or foraged fruit from the quarantine zone into the pest free zone. State law says we have to control apple maggot on our property.
The damage to the apple is caused by a fly that lays its eggs in the apple, and the larvae hatch and eat their way through the apple. It’s a summer-long task to manage this insect. They start laying their eggs in July, and stop in October, so timing is critical. This is a WSU publication that walks you through it step by step. http://pubs.cahnrs.wsu.edu/publications/wp-content/uploads/sites/2/publications/eb1928.pdf If you carefully follow all the instructions, you should have good fruit next year.
This is one of the best publications I’ve seen for organic management of insect pests in home trees. This is the website to the html version, https://catalog.extension.oregonstate.edu/ec631/html . The PDF version is easier to navigate. Click the PDF button to download a free copy of the publication. https://catalog.extension.oregonstate.edu/ec631