. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 29 spreading the disease. The early spring spores of rusts are often accompanied by structures exuding sweet fluids that are attractive to insects and may be materially beneficial in the sow- ing of spores. There is a certain group of fungi, often known as the honey-dew fiingi, which grow chiefly on the leaves of higher plants. They are not parasites but hve on insect secre- tions and excreta which are deposited upon the leaves of plants. In this rich pabulum the fungi grow luxuriantly and often form very black sooty coats o
. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 29 spreading the disease. The early spring spores of rusts are often accompanied by structures exuding sweet fluids that are attractive to insects and may be materially beneficial in the sow- ing of spores. There is a certain group of fungi, often known as the honey-dew fiingi, which grow chiefly on the leaves of higher plants. They are not parasites but hve on insect secre- tions and excreta which are deposited upon the leaves of plants. In this rich pabulum the fungi grow luxuriantly and often form very black sooty coats on the leaves. Such fungi are often specialized to the secretions of certain specific insect forms. A very curious device has been developed among the so-called birds-nests fungi—a device which has to do with the utilization of insects for the spreading of spores. The fruiting. Fig. 12.—A carrion fungus. The black head at the top of the fruiting body (lying on the leaf) is covered with a sticky solution in which spores are found. Insects, at- tracted by the odor, carry off this solution and thus scatter the spores. Original. body is beaker-shaped and in the little beaker are tiny flattened egg-like bodies, in reality closed cases, the interior of which contains numerous spores. The "eggs-stalks" become gelat- inous and very elastic when wetted and can be pulled out to a comparatively enormous length. These stalks probably serve to attach the "eggs" to insects' legs and later, becoming en- tangled in twigs or leaves, fasten the "eggs" to these objects. Germination of the spores follows immediately under favorable conditions. Undoubted and remarkable examples of insect aid to spore sowing occurs in the so-called carrion fungi. Here the spores are found in a sticky, usually brownish mass, which is at matu-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and app
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