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Page 43 · DO #459 · 204_Popenoe_Bx33FF29r
- Collection
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Wilson Popenoe (1892–1975) family papers
- Item/Folder
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Preface, Introduction, and The Mango - manuscript and notes (typed and handwritten) - chapters in outline for proposed book with Herbert Wolfe, n.d.
- Digital Object
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DO #459,
page 43
- Collection-level dates
- 1882–1975
Page transcription
322 GEIBA VOL. 4
Regardless of the particular method of graftage selected, disease and insect control on the stock and parent trees, season of year for the operation, and careful selection of scions for proper maturity are important to the success of the operation.
The choice between using terminal scions or lateral buds depends chiefly on the abundance of graftwood. The use of budding methods allows a greater number of trees to be produced when economy of graftwood is a factor. This is usually the case when the increase of a new variety is first attempted. Also, the particular technique with which the propagator is most proficient influences the choice of methods. Many prefer the terminal scion because springing is more rapid. Others use the budding method entirely because the scion length of the chip-bud requires a shorter cut and less wrapping material. Speed of the operation is also a factor which favors budding in comparison with the side-veneer graft. Springing the bud requires different procedures than are required with the terminal scion, but this can be successfully done by any of several methods used in Florida.
SIDE-VEENEER GRAFTING. This technique was more exclusively practiced during the period when the Haden variety dominated the mango plantings. With the advent of newer varieties and the greater demand for trees, budding methods are now practiced almost as extensively as the side-veneer, if not tending toward more extensive use.
Side-veneer grafting may be started when the seedling stock has a defined cambium and has formed enough wood to have rigidity. The appearance of the bark will vary from a greenish-pink to a definite green color, and as further maturing occurs, the bark will appear grey with a corky condition noted on older trees where considerable bark sloughs off. The side-veneer graft is also used on large limbs or tree trunks in top-working.
The scion used is almost always a terminal stem two to three inches long. The degree to which the terminal bud is developed gives the best indication as to its suitability. An enlarged terminal that will "spring" in 10 to 14 days is ideal. Leaves are removed as the scions are taken from the parent tree. The scions are placed in damp peat or sphagnum moss until the grafting operation. The cut on the scion
1956 CURRENT METHODS 325
Enlargement of the bud takes place as well as development of vascular tissues between the bud and stock. When it is determined, through experience, that conditions are right for springing of the bud, the seedling may be topped completely just above the bud or it may be lopped as done with citrus trees. This method may be considered rather clumsy nursery practice, that is, leaving the bud dormant for several weeks or even months; but it accomplishes the springing of a vigorous sprout in contrast to the rather slow growth derived from method N° 1. It will have to be determined which method will work best for the individual attempting it.
3. When is is fairly certain that union between scion and stock has taken place and the bud is advanced enough that it seems highly probable springing will take place in two to three weeks, the stock may be cut off completely just above the bud. However, it is generally considered safer to follow either method N° 1 or N° 2 because delay of springing may stunt the plant or, in some instances, kill it.
MODIFIED CHIP BUDGING. This method has also been reported previously (5, 6), but certain procedures have been improved in the sprouting of stocks and the springing of buds. The method is not in widespread use but should greater numbers of trees be needed, it will probably become more widely accepted. It does require grafting within a more limited time schedule, due to the fact that the young rootstock is in a "red" or "purple" stage of growth for only two to three weeks. This period can be extended under certain specialized environmental conditions such as shade or deep planting in the seedbed.
Sprout the seeds after removing the hull, in peat moss. If increase in diameter of stock is desired for easier manipulation in the grafting operation, it can be accomplished by planting the seed six to eight inches deep in peat moss. These seedlings, before leaves have developed to any great extent and the plant still receives the major part of its nutrients from the cotyledons, can be grafted or budded: (a) immediately and replaced in the peat moss and potted in one week, (b) as they are removed from the seedbed and potted, or (c) a few days after potting. By another workable procedure, seeds may be placed in peat moss to determine viability (5) and as soon as the radicle begins to protrude, potting of the germinating seed can be done. Graft-