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Abstract

Research was conducted in Lajas, Puerto Rico, to determine the effect of an extract of the brown alga (Ascophyllum nodosum), applied at different rates and times, on fruit retention in Tahiti lime (Citrus latifolia Tanaka). A commercial formulation of the alga extract (Stimplex™) was diluted in water and sprayed covering the tree canopy, applying 0 (check treatment), 6, or 12 ml of the extract per tree per application. Applications were made 21 days apart, from January-March (from the preflowering stage through full bloom stage) or January-April (from the pre-flowering stage through the fruit set stage). Application at the rate of 12 ml per tree did not affect fruit retention, whereas the rate of 6 ml per tree from pre-flowering stage through the fruit set stage increased fruit number by 68% as compared to that of control trees.

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