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.
Do not can tomatoes with late blight. Tomatoes showing signs of late blight disease have firm, dark brown lesions that quickly become large, wrinkled and somewhat sunken. Diseases such as this may lower the acidity of the tomato flesh to a level that makes it unsafe for canning.ate blight in both tomatoes and potatoes is caused by the oomycete Phytophthora infestans, and is a worldwide destructive disease. Under favorable weather conditions, tomato and potato crops can be destroyed within days.