I'm planning to trellis my squash plants this year in the hopes that better airflow will slow down the powdery mildew. My question is how long will the vines get of these varieties? I want to plan the length of the trellis correctly.

1. spaghetti squash (pasta hybrid)

2. acorn squash (honey bear)

3. pumpkin (early sweet sugar pie)

4. tromboncino rampicante (grown as summer squash)

Last year the spaghetti, acorn, and pumpkin grew together on the ground into a huge mass of leaves and vines that were wiped out by PM in early August. This year I'm going to trellis, spray with milk and/or baking soda (any advise there?) and I have switched the Acorn to a PM resistant variety.

The garden is in full sun, zone 5 (upstate NY).