La t©♭cnica del injerto hipocotiledonar del cafeto para el control de nem©Łtodos
Until now the most efficient and economical method for controlling coffee nematodes seems to be the hypocotyledonary grafting (wedge type) using Coffea arabica as scion and Coffea canephora var. robusta as stock. Besides being nematode resistant, Robusta coffees are also resistant to coffee canker (Ceratocistys fimbriata). A convenient hypocotyledonary grafting technique has been developed. The seedlings are grafted at a very early stage of development, before the cotyledons spread open. To prepare the rootstock a Robusta seedling is rooted out and the roots partially trimmed. The upper part of the seedling is cut off, leaving about 4 to 5 cm. of the hypocotil above the juncture of the root and shoot. Then an incision is made lengthwise about half and inch long, starting in the upper part of the hypocotil. For the scion a wedge-shape cut is made in an Arabica seedling, about 2 cm. bellow the cotyledons. This wedge-shape end is inserted into the incision of the root-stock and both scio n and stock are firmly tied together at the grafted junction, using 1.5 x 25.0 cm. polyethylene ribbon. The grafted seedlings are placed into a propagator at 80-90 of relative humidity and a temperature of 20-25ðC. Forty fo fifty days after grafting the bandage is removed and the grafted seedlings transferred to a nursery. Using the technique described above several thousand seedlings of 23 varieties and cultivars of Coffea arabica have been grafted on Coffea canephora var. robusta and a holding percentage higher than 95 has been obtained. No noticeable differences in growth and vigor between grafted and nongrafted seedlings grown in the same seed bed were observed
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| Format: | biblioteca |
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| Subjects: | COFFEA ARABICA, COFFEA CANEPHORA, ALMACIGO, INJERTO DE PUA, CONTROL DE NEMATODOS, GUATEMALA, PROPAGACION VEGETATIVA, |
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