. Dairy farming : being the theory, practice, and methods of dairying. Dairy farms; Dairy plants; Milk plants. DISEASES OF PLANTS. 17J. Fig. G9.—Sectkin through OV.\RY OF , AT- TACKED BY Smut. immediately lieueath. % turn become also tlio prey of disease. These fui)<;'al diseases are known by such names as smut, Ijiuit, rust, mildew, and ergot. Some attack one part of a plant, others another. Smut attacks the younti' seed, and sometimes it de- stroys the glumes as well. It is indicated by masses of dark-coloured dust (the spores) emerging from the iuHoreseenee, and perhaps from that j
. Dairy farming : being the theory, practice, and methods of dairying. Dairy farms; Dairy plants; Milk plants. DISEASES OF PLANTS. 17J. Fig. G9.—Sectkin through OV.\RY OF , AT- TACKED BY Smut. immediately lieueath. % turn become also tlio prey of disease. These fui)<;'al diseases are known by such names as smut, Ijiuit, rust, mildew, and ergot. Some attack one part of a plant, others another. Smut attacks the younti' seed, and sometimes it de- stroys the glumes as well. It is indicated by masses of dark-coloured dust (the spores) emerging from the iuHoreseenee, and perhaps from that jiortion of the stem Barley, rye, wheat, and es- pecially oats are attacked by smut, wild grasses being less liable. In warmer countries, maize and millet suffer, swellings us large as a turnip being some- times produced in the former (Figs. (58 and 09). The bunt, brand, or pepper-brand infests all kinds of wheat, spelt being less liable to attack than other sorts, and winter wheat less than spring wheat. This fun- gus, like smut, attacks the young seed, which it destroys and re- places by a black greasy sub- stance of disagreeable odour. 70 and 71.^ Rust and mildew attack chiefly the leaves and stems, and not often the seads, so that the injury rests chiefly in the very bad quality of the straw; nevertheless, the grains suffer to some extent. Rust is first indicated by blotches of browh rust-coloured dust breaking out on the surface of the jjlant. Certain spnres are then produced which get transferred to the bar- berry plant, on the leaves of which another stage in the life-history of the fungus is completed, re- sulting in the production of a new set of spores which can only germinate on wheat or some similar plant. This disease usually attacks wheat, barley, and oats; it is Fig. 70.—Bunt less frequent in rye and pasture- grasses. Mildew forms a delicate web-like covering on the green leaves of clovers, turnips, mangolds, &c. Ergot, or ergot of rye, as it is fre
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