. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. 540 ENCYCLOPEDIA OF PRACTICAL HORTICULTURE. Fig. 1. Scurfy Scale. Purdue Bulletin 118. Control —^-_ Same as for San Jose scale. E. O. EssiG Seventeen-Year Locust.—See Periodi- cal Cicada, this section. Six-Spotted Spider.—See Red Spider, this section. Syneta.—See Fruit Tree Leaf Syneta, this section. Tent Caterpillars Malacasoma erosa Stretch. Ma
. The encyclopedia of practical horticulture; a reference system of commercial horticulture, covering the practical and scientific phases of horticulture, with special reference to fruits and vegetables;. Gardening; Fruit-culture; Vegetable gardening. 540 ENCYCLOPEDIA OF PRACTICAL HORTICULTURE. Fig. 1. Scurfy Scale. Purdue Bulletin 118. Control —^-_ Same as for San Jose scale. E. O. EssiG Seventeen-Year Locust.—See Periodi- cal Cicada, this section. Six-Spotted Spider.—See Red Spider, this section. Syneta.—See Fruit Tree Leaf Syneta, this section. Tent Caterpillars Malacasoma erosa Stretch. Malacasoma pluvialis Dyar. Malacasoma constricta Stretch. By H. P. Wilson Tent caterpillars, so-called because they build nests wherein they usually remain when not feeding. These nests are formed out of silken threads secreted by the lar- vae and serve both as a shelter and a protection against natural enemies. Of the many different species which exist throughout the world only three are at all serious in the Northwest. To the casual observer there is little difference between the larvae and adults of these species when looked at separately. Taken side by side, however, the full-grown lar- vae may be easily distinguished, one species from the other. *According to Professor F. L. Wash- burn, a former entomologist of the Oregon Agricultural College, of the three, Malaca- soma erosa, Malacosoma pluvialis, and ^Malacasoma constricta, the first named feeds upon almost everything but the pear, viz.: apple, quince, cherry, rose, prune, etc. The second has about the same food plants as the first. The third devastates whole groves of oak, particularly Quercus gar- ryana, occasionally migrating to the prune, and thereby causing considerable alarm among orchardists. During the past two or three years M. pluvialis has been extremely abundant in the western part of Oregon, both on fruit and forest trees. Numerous reports have come in from about Portland and I have observed the larvae
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