Reference for Pesachim 222:3
וכל דקשי סילויה קשי טולי' לבר מכרו משא אע"ג דקשי סילויה לא קשי טוליה דאמרה לה שידא לברה פירחי נפשיך מכרו משא דאיהו הוא דקטיל לאבוך וקטיל לדידיה אמר רב אשי חזינא לרב כהנא דפריש מכולהו טולי
Some say: Also the shade of a ship and the shade of a willow. This is the general rule: Whatever has many branches, its shade is harmful, and whatever has hard prickles [or, wood], its shade is harmful, except the service-tree, whose shade is not harmful although its wood is hard, because Shida [the demon] said to her son, 'Fly from the service-tree, because it is that which killed your father'; and, it also killed him. R'Ashi said: I saw R'Kahana avoid all shades. [The demons] of caper-trees are [called] Ruhe [spirits]: those of sorb-bushes are [called] Shide [demons]: those which haunt roofs are [called] Rishpe [fiery-bolts].