Biology and ecology of Tyora tessmanni (Homoptera: Psyllidae) with special reference to its role as cocoa a pollinator in Ghana
The incubation period of Tyora tessmanni Aulmann takes from 2 to 3 weeks. Nymphs undergo 5 developmental stages each of which is marked by a definite number of antennal segments. It was discovered that waxy thread secreted by the nymphs served, among other things, for aerial migration and pollination of cocoa flowers (Theobroma cacao Lin.). Sexual maturity of adults is accompanied by a color change, and mating is performed by both sexes sitting side by side on the same plane. There are 7-8 generations of this insect a year. Habitat of the nymphs includes terminal buds, young leaves, flower cushions and small pods. The nymphal concentration in any of these structures depends on the time of the year. Population pressure and microclimatic conditions cause the nymphs, after reaching the 2nd instar, to migrate by crawling and by wind. The overall population of T. tessmanni seems to change little throughout the year
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| Format: | biblioteca |
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1973
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| Subjects: | THEOBROMA CACAO, HOMOPTERA, POLINIZADORES, BIOLOGIA, ECOLOGIA ANIMAL, HABITAT, TYORA TESSMANNI, GHANA, AFRICA OCCIDENTAL, |
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