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.
Colletotrichum coccodes. 1  Infections are visible only on ripe and over ripe tomatoes. 2  Fruit spots are sunken and round. 3  Mature fruit spots have a black center.  Fruit spots produce pink spores with 1  moisture. No visible spots on leaves and stems.  More information on Anthracnose...