ENTOMOLOGY 61 



directed against the moths, eggs and larvae have all proved fail- 

 ures, and only partial success has been attained by thorough cultiva- 

 tion to destroy the larvae and pupae in their cocoons. However, 

 thorough cultivation seems to be the only remedy at hand at present. 

 Plum Aphids. Several species of plant lice infest the plum, 

 the two most important being the true plum-louse which remains 

 on the plum all the year round ; and the hop-louse. This latter spe- 

 cies is restricted to regions where hops are grown, as a matter of 

 course, and migrates, back and forth between the two host plants, 

 spending the summer and early fall on hops, and late fall, winter 

 and spring on cultivated or wild plum. In other words the eggs 

 are laid on the plum branches in October to hatch out the following 

 spring. The young lice which are at this stage provided with wings, 

 migrate to the hop yards for the summer, their progency coming 

 back to winter quarters in the fall. The true plum-louse remains 

 the year round on the plum trees, curling the leaves and sometimes 

 doing considerable damage. The ordinary spray of kerosene-emul- 

 sion, or tobacco-water, will kill the lice easily enough if they can be 

 reached. Very thorough work in the central part of the tree is re- 

 quired to hit them because of the curled condition of the leaves. 

 (Bui. 308, Cornell Exp. Sta.; Bui. 24, Mich. Exp. Sta.) 



INSECTS AFFECTING THE CHERRY. 



The Divaricate Buprestis. This is a medium sized beetle with 

 very hard, strong wing-covers and a flattened body. The surface is 

 bronzy, and furrowed, the spaces between furrows being highly pol- 

 ished. This insect bores into living wood much as does the flat- 

 headed apple-tree borer. It works in cherry and most of our stone 

 fruits beside a number of forest trees. The remedies are the same 

 as those for the flat-headed borer of the apple. 



The Cherry-Tree Plant-Louse. A large, black, polished plant- 

 louse that works on the young shoots and tender foliage of the cherry, 

 often appearing in very great numbers. They multiply rapidly, 

 sometimes covering the twigs and young fruit, and secreting a sticky 

 sweetish liquid called honey-dew. This attracts ants, yellow-jack- 

 ets, flies, etc. Late in the season they often become numerous be- 

 fore laying the eggs for the spring brood. Kerosene-emulsion or 

 any of the contact insecticides, applied in the ordinary way, except 

 that it should be a little stronger than when used for green lice. 

 It must be borne in mind that each louse must be hit in order to be 

 killed. 



The Cherry Leaf-Beetle. A small, dark-red beetle less than 

 one-fourth of an inch in length, oval in form, and with the antennae 

 and parts of the legs black. The small beetle feeds on cherry. The 

 writer has seen them in great numbers on pin cherry (a wild cherry) 

 at AuTrain Falls in late August. The beetles have welcomed with 

 enthusiasm the introduction of the cultivated cherry in their haunts, 

 readily accommodating their taste to the new foocl. They feed on 

 the leaves, and often come in large numbers, appearing in Juno and 

 again in September. In the Northern Peninsula they do a groat deal 

 of damage to young trees, coming out of the ground from a depth of 



