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.
Q. I have 4'x 8' raised beds in my garden. My peppers, squash, and beans grow well, but my tomatoes have a horrible disease. The leaves get spotty, turn yellow, and eventually fall off. The fruits do fine, but the vines look horrible. Through the help of garden books, I think it's Verticillium Wilt, Fusarium Wilt, or Septoria Leaf Spot.