Forest entomology . es at certain intervals, parallel with the lines, fill in those traptrenches with sods of grass, rolls of bark, weeds, partially decomposedturf, burned sods, layers of cow-clung, and such similar refuse as couldbe conveniently collected. From time to time those trenches mightbe turned up, the larvae collected, and the materials replaced. Another remedy for the larvae is, of course, to periodically green-cropa portion of the nursery ground either for one or two seasons, as by sodoing we should be able to pick out a great many of the injuriouslarvae; and in the case where the
Forest entomology . es at certain intervals, parallel with the lines, fill in those traptrenches with sods of grass, rolls of bark, weeds, partially decomposedturf, burned sods, layers of cow-clung, and such similar refuse as couldbe conveniently collected. From time to time those trenches mightbe turned up, the larvae collected, and the materials replaced. Another remedy for the larvae is, of course, to periodically green-cropa portion of the nursery ground either for one or two seasons, as by sodoing we should be able to pick out a great many of the injuriouslarvae; and in the case where the seedlings were to remain in the groundfollowing such cropping, say for one season only, the nursery cropwould be removed before any considerable damage would ensue. Melolontha hippocastani (Fabr.) The beetle (fig. 47) greatly resembles the common cockchafer, butis smaller, being only 20 to 25 mm. long. Antennae and legs dark-brown or black. Tail shorter, more abruptly tapering, and somewhatclubbed at its 48 FOREST ENTOMOLOGY. Life-history and economy.—In West and South Germany, similarto those of the common cockchafer, with which it swarms, but insmaller numbers. In East and West Prussia in the midst of greatScots pine woods, this species alone destroysforests, the common cockchafer confining itsattacks to agricultural lands. It does notmerely attack horse - chestnut, as its nameimplies, but nearly all trees. The larvae arehighly destructive to young Scots pines threeto six years old, but in their fourth summerthey attack the roots of poles fifteen to eigh-teen years old, and even those of older hippo- Season for swarming early (April). The eggs castani. (FromForest Pro- J id ? ht t fourteen days afterwards, tection, by W. R. Fisher.) » J 10 to II inches deep in dry soil, but in moistsoil only 1\ to 4 inches deep. The larvae appear in .July, and pupatein August of the fifth year, about \\ foot deep. The chafers comeout in September and O
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