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.
Overview. If your roses are displaying black spots and yellow leaves, the plants are infected with a fungal disease called black spot.Though the disease is referred to as black spot, other symptoms of the underlying problem, like yellowing of leaves, become apparent.f your roses are displaying black spots and yellow leaves, the plants are infected with a fungal disease called black spot.