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.
Tomato stems and leaves. Tomato plants are also susceptible to late blight, and the foliar symptoms are similar. Like potato, infected tomato plants (Figure 12) may be rapidly infected and destroyed by P. infestans.White sporulation (sporangia and sporangiophores) (Figure 13) may be visible in humid weather.omato stems and leaves. Tomato plants are also susceptible to late blight, and the foliar symptoms are similar. Like potato, infected tomato plants (Figure 12) may be rapidly infected and destroyed by P. infestans.