Central PA Fall Discussions and Obs

[Yardstickgozinya]

2 hours ago, Voyager said:

Hour past nooners and 83 here...so far. Part of me wishes we'd stay this warm through Halloween. Outside of a few early turners, nearly all the trees are still summer green. The anomaly lover in me wants to see how long it would hold, or would the lack of sunlight/photosynthesis turn them regardless of the summer-like temps.

Most plants are aborting at this point because of low moisture in the rhizospher. You need a shorter day than where we're at at this point to trigger etiolation in most plants and trees. However, auxins and other hormones are tied to photo period length and temperature. If the cooler temperatures don't cause abscission, first the shorter photo period eventually will.

[Voyager]

1 hour ago, Yardstickgozinya said:

Most plants are aborting at this point because of low moisture in the rhizospher. You need a shorter day than where we're at at this point to trigger etiolation in most plants and trees. However, auxins and other hormones are tied to photo period length and temperature. If the cooler temperatures don't cause abscission, first the shorter photo period eventually will.

That's kind of what I thought.