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Effect of fruit maturity on mango infestation by fruit flies: from experimental analysis to modeling

Grechi I., Lechaudel M., Diatta P., Diarra K.. 2015. Darwin : ISHS, 1 p.. International Mango Symposium. 11, 2015-09-28/2015-10-02, Darwin (Australie).

Mango production is confronted with fruit flies which cause considerable production losses. Fruit maturity is known as a major factor of fruit fly infestation. Our aim is to better characterize and model the relationship between fruit maturity and mango infestation by fruit flies. Our study was conducted in the laboratory (non-choice tests in cages) and in the fields (monitoring of fruit flies, fruit maturity evaluation and mango infestation recording), in Senegal and Reunion Island. Fruit maturity was describe by either a visual (green, turning and ripe stages) or a quantitative (chlorophyll fluorescence parameter) indicator. Non-choice tests showed an egg-laying preference of fruit flies for mature fruits but the maturity level at which the fruit elicits egg-laying behavior of flies varied between mango varieties: only ripe fruits were infested by B. invadens on Kent whereas both turning and ripe fruits were infested on Irwin. In the fields in Reunion Island, results suggested that mango infestation, mainly by B. zonata, occurred at an earlier maturity stage on Kentcompared to Cogshall and Jose varieties. Infestation rates of Cogshall, Jose and Kent fruits were 8%, 12.5% and 37.5%, respectively. A quantitative relationship between mango infestation and fruit maturity (as described by the chlorophyll fluorescence parameter) was established on Kent variety. In the end, mango-fruit fly relationship will be incorporated into a crop simulation model predicting fruit yield and quality development. It should be used to optimize harvest stage of mangoes for a compromise between fruit quality and risk of production losses.

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