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.
septoria leaf spot septoria leaf spot is a disease caused by the fungus septoria lycopersici according to iowa state university this is the most common foliar leaf disease in tomato plants small spots appear that initially look water soaked then develop gray and white centers with darker edges tiny black spots appear in the center of the spot as the disease matures lower leaves are infected first but the disease spreads to the top leaves over time this eventually causes defoliage of the plant