Normal view MARC view ISBD view

A review of relationships between shade types and cocoa pest and disease problems in Papua New Guinea

by Smith, E.S.C.
Publisher: Jun 1985Subject(s): THEOBROMA CACAO | SOMBRA | PLANTAS DE SOMBRA | LEUCAENA LEUCOCEPHALA | INSECTOS DAÑINOS DE LA RAIZ | GLIRICIDIA | PAPUA NUEVA GUINEA In: Papua New Guinea Journal of Agriculture, Forestry and Fisheries (Papua Nueva Guinea) v. 33(3-4) p. 79-88Summary: In Papua New Guinea, unlike most other cocoa cultivating countries, the permanent overhead shade is provide mainly by coconuts and/or Leucaena leucocephala (Lam.) De Wit. Selection of cocoa shade species has been based on agronomic characteristics and there have been few attempts to determine the relationships between cocoa pests and diseases and the shade species. This paper outlines the major pests and diseases in Papua New Guinea cocoa plantings and reviews their relationships to the main shade trees used. Evidence is presented to show that many of the present day problems have arisen from the use of leucaena as a shade tree. In contrast, the widespread practice of interplanting cocoa under coconut palms has considerable economic and managerial advantages and the cocoa generally suffers less from insect and disease attack than sole planted cocoa. It is concluded that recommendations incorporating the planting of high yielding, disease resistant cocoa under high yielding, hybrid coconut palms at least three to four years old, should be formulated and actively promoted in Papua New Guinea
    average rating: 0.0 (0 votes)
No physical items for this record

53 ref. Sum. (En)

In Papua New Guinea, unlike most other cocoa cultivating countries, the permanent overhead shade is provide mainly by coconuts and/or Leucaena leucocephala (Lam.) De Wit. Selection of cocoa shade species has been based on agronomic characteristics and there have been few attempts to determine the relationships between cocoa pests and diseases and the shade species. This paper outlines the major pests and diseases in Papua New Guinea cocoa plantings and reviews their relationships to the main shade trees used. Evidence is presented to show that many of the present day problems have arisen from the use of leucaena as a shade tree. In contrast, the widespread practice of interplanting cocoa under coconut palms has considerable economic and managerial advantages and the cocoa generally suffers less from insect and disease attack than sole planted cocoa. It is concluded that recommendations incorporating the planting of high yielding, disease resistant cocoa under high yielding, hybrid coconut palms at least three to four years old, should be formulated and actively promoted in Papua New Guinea

Click on an image to view it in the image viewer