This section is from the book "The American Garden Vol. XI", by L. H. Bailey. Also available from Amazon: American Horticultural Society A to Z Encyclopedia of Garden Plants.
By Eleanor A. Ormerod, Consulting Entomologist of the Royal Agricultural Society of England. The first article called in the April American Garden. A disease which has appeared in many parts of England, and commonly called clover stem sickness is found to be caused by one of these minute destroyers - Tylenchus devastatrix. They work upon the inside of the stem, dwarfing and blasting the plant. This stem eelworm as the author calls it, infests many kinds of crop and weed plants, and can pass from one to the other; consequently rotation of crops is one point to be considered in the matter of prevention. Some of the field crops most subject to attack are oats, rye, clover, teasels and buckwheat; onions are also very liable to it, and there is also a potato-sickness caused by Tylenchus devastatrix. This new form of attack was observed by Dr. Kuhn in Germany, and also by Dr. Ritzema Bos in 1889 ; and as a threadworm or nematode attack has appeared in potatoes in the United States, it is probable that this same eelworm is causing it" of this valuable report brings to light another plant attacked by the nematode worms to which attention was "It is highly desirable, when there has been stem eelworm attack to take as the next crop something that is not known to suffer from it. * * * Infested earth may carry the eelworm from one place to another. * * One measure of prevention is deep plowing, or in smaller areas trenching, such as will turn a fresh clean unin-fested surface to the top ; and as a remedy when attack is even seriously present, a dressing chiefly or entirely composed of sulphate of potash and sulphate of ammonia, at the rate of 3½ to 4 cwt. to the acre has been found to answer".
Codlln Moth In Nevada.
Miss Ormerod illustrates and describes two currant insects, to which fortunately Americans are yet strangers. The first is a disease known as "bud-gall" caused by a naite, closely related to those which cause such curious malformations of maple leaves in this country. The second is the white woolly currant scale - an insect very similar to the cottony cushion scale of our maples.
A number of insects affecting fruit are discussed. The American reader is struck with the inconvenience of many of the remedies proposed as compared with our modern process of spraying with ar-senites. As noted in a recent American Garden this process encounters a very strong prejudice in England, but Miss Armerod is earnestly striving to introduce the practice there, and in the present report adduces much evidence from our experience in its favor. It is to be hoped that our conservative cousins will profit by it. C. M. W.
Clover Stem Slckness*
Current Insects.
Fruit Tree Pests.
Garden, I said that "there are only about 250 species of plants cultivated for food among civilized peoples." This is De Candolle's estimate, and it may be supposed to include all the important species. It is well known, however, that over four times this number of plants are cultivated for food in one form or another in all parts of the world. Dr. Sturtevant's notes (Agricultural Science, 1889, 174) record 1,070 species of "cultivated food plants." But even this number is less than one percent. of known species of plants, and it does not in the least invalidate my argument. - L. H. Bailey.
 
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