Bonide 167 1-Quart RTU Rot-Stop Tomato Blossom End Rot Rot Stop Tomato Blossom End rot. Chemical Pesticides and Herbicides Manufacturer: BONIDE PRODUCTS INC P Manufacturer part number: 167 Correct calcium deficiency Controls blossom end rot on tomatoes and other vegetables Apply to developing fruit and foliage after periods of heavy rain or rapid growth Nutritional Calcium 1.6-percent ready to use Correct calcium deficiency Controls blossom end rot on tomatoes and other vegetables Apply to developing fruit and foliage after periods of heavy rain or rapid growth Nutritional Calcium 1.6-percent ready to use