. [Scientific lectures]. es andfrom the same mycelium as the rust previously described, and isgenerally considered at the present time to bethe same fungus. Other grain and various otherplants are likewise affected. Fig. 3 represents at a, wheat straw infested withthis rust; 6, cluster of spores magnified ; c, singlespore magnified 300 diameters. This rust is so common and so much alike onaU plants that this plate will answer to representthe fungus wherever found. Let us now for the third time visit our wheatfield. It Is ripe, or else much damaged, possiblydestroyed by the fungi. On the straw
. [Scientific lectures]. es andfrom the same mycelium as the rust previously described, and isgenerally considered at the present time to bethe same fungus. Other grain and various otherplants are likewise affected. Fig. 3 represents at a, wheat straw infested withthis rust; 6, cluster of spores magnified ; c, singlespore magnified 300 diameters. This rust is so common and so much alike onaU plants that this plate will answer to representthe fungus wherever found. Let us now for the third time visit our wheatfield. It Is ripe, or else much damaged, possiblydestroyed by the fungi. On the straw we shall find black lines, or black-ish spots, from the size of a pins head to an inchin length ; this is the mildew, rust, or Puccinia—it matters not what name it is called, in fuU ma-turity, and when once seen it is never may dispute about its intermediatestages ;—may give it different names when foundon other plants,—but it still remains the greatpest of the husbandman. There are no lingering. 12 Vermont Board of Agkicolture. doubts in the minds of the agriculturists, botanists, savans of science,or laborers, that the rust is not injurious, because the most casualobservation shows it in the sickly condition of all plants affectedthrough the season. The manner of impregnation is unknown, or if known is in believe as the stomata or breathing pores of the plant are openin damp weather, that the infinitesimal germs enter these pores andgain a foothold, and push their rootlets into the cellular tissue of theplant. Others think they enter from the ground through the roots, andothers still do not believe that they enter the plant at all, but that theseeds are poisoned by the touch of their spores. Be it as it may, wewell know that it exists, and of course desire to have as little damagefrom it as possible. Observation has shown that rich land, or thatmanured by old manure, is much more likely to have the grain cropinjured than land not so rich
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
