Evaluation of five chemical treatments for the control of Erwinia sp. in mango fruits, variety Tommy Atkins, in Turrubares, Costa Rica.
Coto B., Wang A.
Author Affiliation: Laboratorio de Fitopatología, Escuela de Fitotecnia, Facultad de Agronomía, Universidad de Costa Rica, San José, Costa Rica.
Agronomía Costarricense 19 : 15-20
Abstract : A bacterial disease caused by Erwinia sp. affects mango production in Costa Rica and may cause yield losses of >50%. In a trial in Turrubares, started before blooming, 9 foliar sprays (at 2-week intervals) were applied to trees with Kilol L DF-100 (a citrus seed extract), chlorothalonil + copper oxychloride + maneb (as Bravo C/M), pentahydrated copper sulfate (as Phyton-27) and Bordeaux mixture, and 4 sprays of streptomycin sulfate + oxytetracycline + tribasic copper sulfate (as Agrimycin 500) were followed by 5 sprays with chlorothalonil (as Daconil 500 F) at 2.5 ml, 11.4 g, 0.5 ml, 5 g, 2 g and 5 ml/litre of water, respectively. The best results were obtained with Bordeaux mixture (23.5% diseased fruit) and pentahydrated copper sulfate, compared with controls (46.3%). Sprays with streptomycin sulfate + oxytetracycline + tribasic copper sulfate followed by chlorothalonil, the citrus seed extract and chlorothalonil + copper oxychloride + maneb did not give disease control.