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Page 42 · DO #1164 · 27_Morrison_Bx7FF8r
- Collection
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Benjamin Yoe Morrison (1891–1966) papers
- Item/Folder
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Report on a trip to Colombia, 1943–1944
- Digital Object
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DO #1164,
page 42
- Collection-level dates
- 1915–1965, n.d.
Page transcription
-37-
"With avocados, Guatemalan varieties apparently may be budded on any of the three races, but West Indian varieties are unsuccessful on Mexican stock; hence, I believe it would be advisable to always select stock similar to that of the scions intended for use. With mangoes, the largest nursery near us prefers turpentine stock for use with all varieties, the Philippine, Saigon or Cambodiana stock being least suitable.
"The largest and strongest seeds of both avocados and mangoes should be selected for planting. No special preparation of avocados is needed other than to have them fresh. Mango seeds should be removed from the shell for planting. Seeds of both species are germinated in the lath house in a special bed, composed of shavings or sawdust 4 or 5 inches deep beneath the seeds, with the seeds covered lightly with the same material. Avocado seeds should be placed in the germinating bed with the end uppermost which was nearest the stem of the fruit. When seeds show sprouts 2 or 3 inches long, they are ready for removal. Avocado seeds should be planted in regular avocado boxes, which are approximately 6 x 6 x 12 inches, where the seedlings will remain in the lath house until after budding or grafting. Six-inch cylinders of 30-pound asphalt building paper have been found suitable here but do not last over a year and in the tropics might not be as durable. Germinated mango seeds seldom are planted in boxes but are placed directly in field nurseries. On fertile, well watered soils in the tropics, mangoes probably should be planted in single rows, 4 feet apart with seeds set 2 feet apart in the row. Some economy of space may be had by planting in two rows separated by 2 feet with a 4-foot space between each set of double rows, as shown in diagram C enclosed. With us here, where soil is not so rich nor well watered, diagrams A or B would be suitable for field nurseries. Using diagram D for field planting of mangoes, approximately 2 1/2 acres of land would be needed. In order to be assured of 10,000 budded plants of either avocados or mangoes, 10 to 20 per cent additional plants should be grown. Avocado seedlings and budded plants should be kept in a partially shaded structure, such as a lath house or palm-covered shed until nearly ready for field planting, when they may be hardened off by more exposure to the sun. Arrangements for boxes in such a house are shown in the enclosed diagram. Possibly an arrangement intermediate between lath house diagram A and B might be found desirable, in which case a house of approximately 25,000 square feet would be needed for 12,000 seedlings.
"Little budding of avocados is now done in Florida, grafting of very young plants having superseded it. Avocados of 2 to 4 months of age are used in grafting, the scions being the tips of the last matured growth on branches just before a new flush of growth starts. These tips are inserted either as side grafts in a seedling or as cleft grafts, and grafted plants by this method should be ready for setting in the field in from 10 to 14 months after the date of