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Show TIME FOR SPRAYING. Editor Tribune: The time has arrived ar-rived for spraying all apple, pear and quince trees and gooseberry and black currant bushes with arsenical spray, also called formula No. 1, which is either paris green or white arsenic dissolved dis-solved In soda or lime, thc formula of which is given In all notices circulated by Inspectors, and can also be had on application. Some people will most seriously tell you there is no good in spraying, as they have tried to put the spray on worms or insects, or dropped them in paris green spray and the worm or insect in-sect has crawled away unharmed. Such people show how little they know of the principle of spraying. With your permission I will explain. Paris green or any arsenical spray only kills Insects whenever said insects either eith-er eat part of the leaves or fruit whereon where-on it is sprayed, and does not affect them by coming in contact with their bodies, but only when it gets Inside of said insect, so you may readily see that dipping them In it would be harmless to them. On the other hand, the kerosene emulsion, emul-sion, also tobacco, or nicotine, or caustic caus-tic spray, kills Insects by contact, an altogether al-together different principle. Some will Bay, "Why not up that, then, to get immediate im-mediate results r' For this reason: "Though you may kill all insects today, the eggs that have been laid will not hatch out before tomorrow or next day, or next week, .and you fall to reach the embryo insect which said egg contains, whereas spraying with paris green it settles on the foliage and fruit, so whenever the young worm crawls out of its egg and commences to eat. itB first or second meal, it gets a little of said arsenlous poison in its inside, and of course goes on a strike and gives up business. Here, then, is the difference: The one acts as a trap, always ready to destroy the insect as long as the spray docs not lose Its vitality through exposure or being washed off or blown off, the other acts like a shot of a gun; you hit tho Insect, In-sect, and It Is done for; you miss it and it lives and increases and prospers. One class of spray acts immediately and destroys de-stroys by contact, and Its use 2s over, the other does not hurt anything to look at, but keeps Its destroying power In operation for about fourteen days, under un-der ordinary conditions, i " One point more. Sucking insects cannot can-not be reached by paris green or arsenical arsen-ical spray, and must therefore be reached by caustic, nicotine or keroseno spi-ay. Under tho head of' sucking insects, in-sects, wc class all scale and all kinds of lice or aphis or red spider. There- lore, u your peacn or pium trees, or rotse bushes are affected by Ucc do not try ! to spray with paris greon, but use the kerosene emulsion or nicotine wash; but if you aro going to protect your apples and pears, or gooseberries from worms, use the arsenical spray, and repeat in fourteen days, and again in fourteen days, auu so on until the fruit Is ripe. The Bluestone wash or what Is called thc Bordeaux mixture, is also valuable but only in cases where fungus is present; pres-ent; or, in other words, where plant or fruit is inclined to rot, or disease or destruction de-struction outside of thc damage usually inflicted by insects. JOHN P. SORENSEN, Inspector of Pests. Salt Lake countx. |
