. Plant propagation; greenhouse and nursery practice. ong the grow-ing grafts. At the end ofthe first seasons growth,fruit trees should bethree to five feet or eventaller in some of such heightsare ready for orchardplanting. Many trees,however, are allowed togrow till two or evenmore years old. 308. Incubator boxes ingrafting.—Success has been greatly enhanced by an incubator box, in which the grafts in bun-dles or in layers are packed with damp moss and kept at a tempera-ture of 7) to 80 for about three weeks l)y which time callusing is goodrnough to permit removal. The grafts (ma
. Plant propagation; greenhouse and nursery practice. ong the grow-ing grafts. At the end ofthe first seasons growth,fruit trees should bethree to five feet or eventaller in some of such heightsare ready for orchardplanting. Many trees,however, are allowed togrow till two or evenmore years old. 308. Incubator boxes ingrafting.—Success has been greatly enhanced by an incubator box, in which the grafts in bun-dles or in layers are packed with damp moss and kept at a tempera-ture of 7) to 80 for about three weeks l)y which time callusing is goodrnough to permit removal. The grafts (made in the whip style)Iiave their tap-roots shortened to six inches and are potted in six-inch pots. \\ hen a few leaves have , the plants arehardened off and iilaced in a frame for the tirst year. This methodhas given ;il)()ut per cent success. 309. Root grafting vs. top grafting.—tn West Virginia, Kingapples top-worked on seedlings were in fairly good condition at 20years old, whereas others root grafted and set in the same orchard. FIG. 193—FIRMING NEWLY PLANTEDGRAFTS Center wheels pack earth beside the plants. 238 PLANT PROPAGATION were dead at 10 years. Ten Walldow root-grafted trees were alldead but one limb on one tree (most of the 10 died between liveand 10 years), but the 10 top-worked were thrifty at 20 years. Inan orchard of 100 root-grafted and 70 top-grafted trees 4-1: percent and per cent, respectively, died. For propagating apple varieties with weak trunks, top graftingor double working is recommended, Tolman sweet being preferredas a stock because of its close, smooth bark, strong, yet not rapidgrowth and its great longevity. [These methods are thought toaid trees in resisting disease.] 310. Top grafting, while of widest application to es-tal)lished orchard trees, is yet of importance in nurserypractice. To the atithor it seems this method might bemore widely utilized by nurserymen as follows: 311. Top grafting nursery trees.—C. P. Close
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