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 . EFFECT OF ANTHRACNOSE ON THE BOLL A boll of cotton badly diseased with anthracnose and covered with a mass of pink spores. ground. Cold, dam]) weather in the spring is especiallylikely to cause this, and under such climatic conditions thespores of anthracnose are usually |)revalent and to their i)eculiar property of dissolving in water,the spores of fungi often become suspended in rain dropsand are
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 . EFFECT OF ANTHRACNOSE ON THE BOLL A boll of cotton badly diseased with anthracnose and covered with a mass of pink spores. ground. Cold, dam]) weather in the spring is especiallylikely to cause this, and under such climatic conditions thespores of anthracnose are usually |)revalent and to their i)eculiar property of dissolving in water,the spores of fungi often become suspended in rain dropsand are thus carried from infected to uninfected fields byrain and wind, and by insects and animals on whose bodiesthey have lodged, having been deposited by drops of the fungi cling to the stalks and live in the ground andseed and thus infect fields from year to year, recurrence of 25. EFFECT OF ANTHRACNOSE ON THE SEED Diseased seedlings caused by anthracnose. the disease condition will be noted from season to season tothe final total failnre of cotton on that particnlar field nnlessseed selection and crop rotation—to clear the seed and soilfrom the infection—are practiced. Angular Leaf Spot Angular leaf spot is named from the dark angularspots which appear in the. leaves. It is very widespread,but rarely appears to such an extent as to attract observation would x^robably reveal it in every cot-ton field during the growing season from May to July andfrequently later. The disease is first manifested l)y awatery appearance in definite spots which are bounded liythe veins of the leaves. The spots are sometimes very nu-merous and frequently unite into one large area of infec-tion. Often the disease follows one or more of tlie nuiin 26 ribs of the leaf, being bounded on either side by an ir-regular zigzag line. In time the spots become blackish andt
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