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.
Cloudy spot (stink bug damage) Stink bugs feed by inserting their needle-like mouthparts into the tomato fruit and sucking out the juice. Tomatoes with stink bug damage have pale yellow, irregular spots on the skin and white pithy areas just under the skin at the puncture site.