The volume of flame, however, is increased by inert gas, and there is a proportionate diminution of the heating effect. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 Various. Nitrogen by itself is an inert gas, colorless and uninflammable. Scientific American Supplement No. 819 Various.
There are two primary fungus diseases that can produce black spots on tomato plant leaves: Septoria leaf spot and Alternaria leaf spot, also known as early blight. Septoria and Alternaria differ slightly in appearance and prefer slightly different weather climates.
Blossom End Rot. A small, watery-looking spot on the blossom end of young tomato fruits may be blossom end rot. This black spot may remain small or it may enlarge to engulf as much as half the fruit. Blossom end rot does not spread from plant to plant and may not affect all tomatoes on the same plant.