114 THE REPORT OF THE No. 19 



are in their younger stages during wliicli time they feed together, but as 

 they grow older and reach maturity they separate and wander off by them- 

 selves. Hand picking answers as a remedy in most cases, but if the attack 

 should be serious, spraying with Paris green, or any other of the well known 

 arsenical poisons, would soon destroy the larvae. 



The Oyster Shell Scale, Lepidosaphes ulmi, L. (Fig. 51). Occurr- 

 ing commonly in some districts in Ontario on rose bushes of many kinds are 

 the oyster-shell shaped scales, which are so well known from injuries by the 

 insects to fruit trees, particularly the apple. Unlike many other kinds 

 of scale insects, the Oyster-shell Bark-louse has only one annual brood, the 

 insect passing the winter in the eg^ state under the mother scales, and the 

 young larvse appearing in spring. If rose bushes are found to be heavily 

 infested with this scale insect, they should be sprayed in late fall or early 

 winter with a whitewash mixture, using one pound of unslaked lime to every 

 gallon of water. A second spraying should be applied as soon as the first 

 one is dry. The lime hardens on the bark and flakes off during the winter, 

 taking with it the scales with the clusters of eggs. In June when the young 

 lice hatch they may be easily seen running about on the bark preparatory to 

 settling down. When detected the bushes should be sprayed with kerosene 

 emulsion. A simple formula for making this for immediate use in gardens 

 will be found under the paragraph treating of Plant Lice. 



The Rose Scale, Diaspis rosce, Bouche. An unpleasant sight in rose 

 gardens are clusters of roundish white scales which show up conspicuously 

 in contrast to the greenish or reddish shoots of the rose bushes. This scale 

 insect is sometimes very common on neglected bushes, and if not attended 

 to will soon do serious damage. Being a sucking insect kerosene emulsion 

 or whale oil soap are the best remedies. It has only so far occurred in the 

 Province of Ontario around Lake Ontario, its worst attacks being on rasp- 

 berries. 



The Rose Leaf-Hopper, Typhlocyba rosce, L. This common leai-hop- 

 per, which occurs all through the country, wherever roses are grown, is often 

 seen in swarms on the leaves of these bushes. These insects are very small, 

 pale greenish-white, and are often spoken of by the confusing name of "Rose 

 Thrip." Throughout the summer they may be found on the leaves in var- 

 ious stages of development, and are frequently extremely destructive. They 

 can be controlled, however, by spraying the blishes with kerosene emulsion 

 or whale oil soap. 



The Grape Vine Leaf-Hopper, Typhlocyba comes, Say, T. vitis, Harr, 

 etc. An insect which demands much attention every year in Ontario is the 

 Grape Vine Leaf-hopper. Although very destructive to the foliage of grapes, 

 lovers of ornamental plants are often exercised over a small hopping insect 

 which occurs in countless numbers on Virginian Creepers. These insects, 

 also as in the case of the Rose Leaf-hopper, are erroneously spoken of as 

 "Thrip." They are of a translucent white colour prettily marked with red 

 and dark brown lines. In their younger stages they are pale and although 

 lacking wings are almost as active as the full grown insects. These leaf- 

 hoppers pass the winter in the perfect state hidden away amongst fallen 

 leaves and other rubbish. The ground, therefore, should be raked and kept 

 clean during autumn so as to reduce as much as possible the opportunities 

 of these insects wintering near the vines. In all their stages these leaf-hop- 

 pers live by suction and therefore can be killed by contact insecticides. Ker- 

 osene emulsion and whale oil soap are the best mixtures to use, and the 



