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.
Tomato Spotted Wilt Virus. The tomato spotted wilt virus (TSWV) causes dark brown, purple or black spots on leaves. The spots can spread to the stems, causing cankers and streaks. The foliage begins to wilt once the disease spreads, and the leaves become stiff.
If you have noticed tomato leaf spots and the lower leaves turning yellow, you may have tomato early blight alternaria. This tomato disease causes damage to the leaves, stems and even the fruit of the plant.Keep reading to learn more about what causes tomato early blight alternaria and how to treat leaf spot.he best treatment for tomato plant leaf spots is to make sure that you donât get it in the first place. Proper care of your tomato plants will make sure you avoid the dreaded yellow leaves and leaf spots that come with Alternaria Alternata.