| Summary: | The work was developed in the municipality of Abreus, Cienfuegos province between January and February 2013. The objective was to determine the effectiveness of the watery extract of Euphorbia lactea Haw for the control of Plutella xylostella L. in the cabbage crop (Brassica oleracea L.). Bioprepared was obtained fractioning pieces among 3 to 5 cm of young shafts of E. lactea in mature plants of 2 - 3 m of height. 3 kg of the vegetable fractions was deposited in 10 L of water, (proportion 0,3 kg L-1), remaining the mixture in rest during 24 hours. It was removed twice a day in favor of the pointers of the clock. The pH was evaluated at the beginning, and at 24 hours to the bioprepared and to the different concentrations of the watery extract. Concentrations were compared at 12,5 %, 25 %, 50 %, with a control or witness without treatment, as much in laboratory as in field, against larvae of P. xylostella. The watery extracts of E. lactea obtained the highest larvacide effect in the first 24 hours, being the L1 larval stadiums more susceptible. The watery extract E. lactea in proportions of 0,3 kg L-1 to the concentrations of the 25 % and 50 % achieves technical effectiveness against P. xylostella under laboratory and field conditions, without manifesting toxicity to the cabbage crop.
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