Using Rot-Stop For Tomato Blossom End Rot | Willow Ridge Tomato Blossom End Rot Using Rot-Stop by Bonide to correct the calcium deficiency that causes Tomato Blossom End Rot. Related: Controlling Leaf Eating Worms with BT Using Neem Oil To Control Fungus and Insects Willow Ridge2023-05-18T09:19:06-04:00