. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 213 tention than a careless one and must prove of much greater benefit. The matter of apparatus, as pumps, nozzles, etc., must also be left to the judgment and to the financial possibilities of the operator. Good apparatus is, however, indispensable. Whether or not this shall be expensive depends on his ingenui- ty and knowledge. Effect of fungicides. The object of the application of fungi- cides is the destruction of the fungus pest. The substances are necessarily of a poisonous nature and the fear is often en- tertained by
. Minnesota plant diseases. Plant diseases. Minnesota Plant Diseases. 213 tention than a careless one and must prove of much greater benefit. The matter of apparatus, as pumps, nozzles, etc., must also be left to the judgment and to the financial possibilities of the operator. Good apparatus is, however, indispensable. Whether or not this shall be expensive depends on his ingenui- ty and knowledge. Effect of fungicides. The object of the application of fungi- cides is the destruction of the fungus pest. The substances are necessarily of a poisonous nature and the fear is often en- tertained by growers of plants that such applications may be in- jurious to the host plant or to the consumers of the crops or to domestic animals to which the crops or foliage may be fed. It has been found that the fungicides listed below, if sprayed on plants even with considerable frequency, can be made very effective and yet never injure in the least the plant foliage. It has even been claimed that copper solutions such as bor- deaux are beneficial, but such an action is doubtful, or, at best, but very slight. The arsenic mixtures, such as Paris green, which are used to combat insects, likewise exercise no injurious effects upon the host plant when sprayed on in proper amounts. Copper salts in strong solutions are able to injure the roots of plants very seriously but it has been shown that by ordinary spraying absolutely no danger arises from this source, since but a very minute quantity of the salts penetrate to the roots. q HnaTTHM n â imiiB ir' Sprays sometimes fall from trees \ ^nlHHHJffilBll °"^° grass beneath but experi- ments have proven that the quantity is not sufficient to be injurious to cattle, horses or sheep. This was demonstrated for arsenical insecticides. Still another question arises, viz., the effect of sprays on such crops as -A barrel pump. (The Deming Qrchard crops whcrc the fruits Co.) ^. Fic. 10^.-. Please note that these images are extracted from sc
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