In Dacryodesedulis (G; Don) H. J. Lam L and Elaeis guineensis Jacq. Are two fruit species used for food. In Brazzaville, they are among the most representative and cover the entire city. The phonological study of these two species was carried out throughout the city of Brazzaville. The aim of the study is to improve phenological knowledge of these species. The methods used are based on field surveys. The trees selected, marked and geolocated were monitored using the observation method for two years. The various results obtained show that in Dacryodesedulis (G. Don) H. J. Lam., defoliation is widespread on the trees between April (rainy period) and August (dry period). It peaked in June (dry period) with 53.33% of trees recorded. Leafing, on the other hand, is more noticeable than defoliation and starts in January (dry period), then progresses gradually. It becomes visible on the trees at all the sites during the rainy season, between March and June, then decreases in August. Its peak is reached between May and June, with 100% of trees counted. In the case of Elaeis guineensis Jacq. on the other hand, defoliation occurs between June and July (dry period). Leafing occurs throughout the year. The evolution of these different phenophases shows phonological characteristics common to these species, marked by phonological asynchronism, variation and interaction. These results highlight the effect of the seasons on the phonological development of the species studied.
