为了解乙烯利对麻疯树开花及结实的影响，以及乙烯利处理下不同地点麻疯树的结实情况差异，在贵州省罗甸县的2个麻疯树栽培地，用不同浓度的乙烯利溶液处理第1次花后萌生的新枝。结果表明：乙烯利对枝条第2次花序形成无明显的促进作用，用乙烯利处理过的枝条形成的花序数量高于对照，但差异不显著。乙烯利处理新梢对前一批花的坐果数则有较强的抑制作用，且随着乙烯利浓度增高，抑制作用增强，二者呈极显著负相关。2个试验地点的单枝结实量存在显著差异，但形成花序数差异不显著。因此，麻疯树花后1个月内用乙烯利处理枝梢，对雌花坐果有强烈的抑制作用，生产上可用适当浓度进行疏果或果实数量的控制。

The buds after anthesis were treated with ethephon at different concentrations at different time and different places after flower to understand the effect of ethephon on the flowering and fruit set of Jatropha curcas. The results showed that: there was no obvious promotion on the development of flower. There was more number of inflorescence on the growing apex treated with ethephon than on the control, but the difference was not significant. Ethephon had remarkable inhibiting effective on the fruit set of the previous inflorescences, the higher the concentration, the more distinctive the inhibition. The statistics analysis showed a significant negative correlation between them. The number of fruit of each branch was obvious different between the two trial sites, but there was not remarkable different in the number of inflorescence. As a result, the treatments of ethephon in one month after anthesis had obvious effect to inhibit the fruit set and it could be used to thin fruit or to control the number of fruit.