Usually my cherries ripen around the last day of May.
I was late this year putting out protection against birds and I wondered, when I went out to check on the 21st of May, if I was too late. There were not many cherries, compared to last year when I gathered hundreds, when I'd done nothing by the 21st.
Howewer when I went out yesterday, the 24th, there were no cherries!!!
Not even the pits! Three years ago was the only other time with no cherries and I looked on the ground for the pits. I'd been out of town until the last day of May, regretting that I wasn't there to protect the tree, but I had no choice.
The enemies of cherries, from a human pov are the ants and the birds. (From their pov, they are the friends of cherries. "I love cherries" they say. They even have a folk song about it.
Tanglefoot keeps the ants from climbing up the trunk. It's good for weeks but must be applied every year. it doesnt' hurt the tree.
For avoiding birds there is bird netting but the bigger the tree, the harder it is to get it on. And there are reflective mylar strips, like Irri-tape. Never userd before but that's what I planned to use yesterday.
Googling, I learned that some birds, including robins, eat the cherries including the pits!!! They poop out the pits elsewhere, spreading cherrydom. And this year for the first time I saw robins, one on the first day of spring iirc. And others and one yesterday. I looked closely at its mouth to see if any cherry flesh was dribbling from its beak, but it hid behind a tree and by the time I called a policeman, it was gone.
I also learned that robins will eat cherries even before they are ripe. The ants mostly seemed to wait. Robins have no class.
Now that they've found me, they may be back. Next year I will start May
10th or earlier, if I'm here.