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Studies in natural pollination of cocoa in Ghana

, : Studies in natural pollination of cocoa in Ghana. Acta Horticulturae (49): 223-229

Two dominant characters, normal green and red pigmentation, were used to identify cross and selfed progenies of open-pollinated pods from vegetatively propagated trees heterozygous for the recessive albino character. It was found that spacing 6 rows of cacao at 2.4 m X 2.4 m could not prevent the transfer of pollen across that distance by pollinating insects. Other studies involving self-incompatible trees confirmed that pollen could be transferred over even wider distances.

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Related references

Brew, Ah, 1985: Studies on cocoa pollination in Ghana. Proceedings Lome Togo 12-18 Feb Fev 1984 9 International Cocoa Research Conference = Actes Lome Togo 12-18 Feb Fev 1984 9 Conference internationale sur la recherche cocaoyere: 571

Edwards, D.F., 1973: Pollination studies on Upper Amazon cocoa clones in Ghana in relation to the production of hybrid seed. Hand-pollinations at weekly intervals on 3 self-incompatible Upper Amazon cocoa clones over a 2 year period gave high setting rates and high rates of pod recovery. The flowering patterns of the 3 clones varied, as also did their relative intensiti...

Edwards D.F., 1973: Pollination studies on cultivar upper amazon cocoa clones in ghana in relation to the production of hybrid seed. Journal of Horticultural Science 48(3): 247-259

Kaufmann, T., 1975: Cocoa pollination by males of Forcipomyia squamipennis (Diptera: Ceratopogonidae) in Ghana. Cage experiments in the field proved that males of Forcipomyia squamipennis Ingram & Macfie are pollinators of cocoa flowers (Theobroma cacao) in Ghana, contrary to former claims that this species is a non-pollinator and that only females of certa...

Ollennu, L.A.; Owusu, G.K., 1987: Studies of the reinfection of replanted cocoa by cocoa swollen shoot virus in Ghana. The rapid reinfection of replanted cocoa by cocoa [cacao] swollen shoot virus (CSSV) was investigated in trials during 1973-79 on farmers' plots, (usually after swollen shoot treatment) in Ghana. The planting material ranged from the most vir...

Brew, A.H., 1987: The effect of colours and specific features of floral parts on the pollination of cocoa by ceratopogonid midges in Ghana. The effect of specific features and colours of floral parts on pollination of cocoa by ceratopogonid midges was investigated in Ghana in 1981. In the first test, flowers were grease-banded at the bases and flower visitors were trapped by applying...

Brew, A.H.; Boorman, J., 1993: Preliminary observations on the classification of Forcipomyia midges of Ghana with special reference to species involved in the pollination of cocoa. Cafe Cacao The 37(2): 139-144

Glendinntng, D.R.; Legg, J.T.; Lovi, N.K.; Martinson, V.A., 1966: A field experiment in Ghana on the tolerance of cocoa seedlings to cocoa swollen-shoot and cocoa mottle-leaf viruses. Seedlings of Amelonado cocoa and of 2 progenies obtained by crossing Iquitos (Upper Amazon) parents were infected with 3 strains of cocoa swollen-shoot virus (CSSV) and with cocoa mottle-leaf virus (CMLV). CSSV strain 1A had the most severe effect...

Brew, A.H., 1987: Natural pollination of cocoa. The results are presented of investigations in Ghana on the effects of environmental factors on the pollination of cocoa by midges [Ceratopogonidae]. The duration of sunshine appeared to be a prominent contributory factor to both midge populations...

Glendinning, D.R., 1972: Natural pollination of cocoa. From a review of the literature up to 1965 and the author's own work the following conclusions are drawn: In weather conditions suitable for growth flowering continues until suppressed by crop-development. Any excess setting is corrected by c...