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.
My plants are dying from the ground up. I have tons of fruit on the plants but I'm afraid the plant won't live long enough for the fruit to ripen. I'm at a loss yet again this year. Q: My tomato plants have black spots all over the leaves and stems and although I keep trimming them off, it persists.