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.
#2 Blossom-End Rot. Blossom end rot sounds like it should be terminal, but a tomato plant can usually pull itself out of this nosedive. The rot looks like pale, brown spots that turn black and flatten the bottom of the fruit due to a lack of calcium or uneven moisture.