Losses to cotton, what to look for and where to find it, being one of a series of articles in relation to crops, their common diseases and insect pests to which they are subject . urn brown, and the brown parts enlarge and show aseries of concentric markings. If very dark-colored fungigrow upon these spots, they soon become black-coated, andfrom this fact take the popular name black rust, which,however, bears no similarity to, or relation with, the rustof the cereals. The attack of the fungus causes the pre-mature falling of the leaf, thus preventing the proper ma-turity of the i^lant. Losses
Losses to cotton, what to look for and where to find it, being one of a series of articles in relation to crops, their common diseases and insect pests to which they are subject . urn brown, and the brown parts enlarge and show aseries of concentric markings. If very dark-colored fungigrow upon these spots, they soon become black-coated, andfrom this fact take the popular name black rust, which,however, bears no similarity to, or relation with, the rustof the cereals. The attack of the fungus causes the pre-mature falling of the leaf, thus preventing the proper ma-turity of the i^lant. Losses may vary from 5 to 50 per cent,and, being widely distributed, such losses are often veryheavy. It may be safely asserted that this disease cannotattack a cotton plant that is in full vigorous growth, buta sudden checking of growth and lowering of vitality fromany cause. will render it liable to serious injury if theweather conditions favor the growth of this fungi. Frosty Mildew The leaf spot caused by frosty mildew is limitedsharply by the smaller veins, and bears upon the lowersurface numerous colorless spores upon a colorless coat-ing, thus lending a frosted MILDEW OF COTTONShowing the spots of mildew on the leaves. • 28 As seen from above the spots are light yellow or of apaler green than the normal leaf tissue. Widespread,though not especially destructive, frosty mildew does notusually attract the attention of the planter, with the re-sult that the damage done by this disease is most generallysaid to be due to the attack of some insect, or some otherdisease. Red Leaf Blight The foliage of cotton frequently presents a red colora-tion which is not unlike the red or brown of autumn is of exceedingly common occurrence toward the matur-ity of the cotton, even where the growth is quite healthyand rank, but is of rarer occurrence in rich soils than onpoor land. It is es])ecially common on the drier ui)landswhere the soil is worn and poor. Here it occurs (
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Keywords: ., bookcentury1900, bookdecade1910, bookidlossestocott, bookyear1919
