大豆蚜量和蚜害时期对大豆产量的影响

Effects of Aphid Population Density and Damage period on Soybean Yield

本文采用分区分期控制蚜量的方法,试验了不同蚜量和不同为害时间对大豆产量的影响。通过1988年和1989年两年的试验结果表明:大豆有较强的补偿作用和耐蚜能力。大豆蚜引起大豆减产的原因,不仅与蚜量有关,而且与大豆蚜发生的早晚、蚜害的持续时间以及与大豆生长发育期的吻合程度等有密切关系。早期轻微的蚜害或早期重蚜害得到及时防治均不致引起大豆减产,蚜害发生晚为害也轻,而连续严重的蚜害则可造成20％—30％的损失。

This paper discussed the effects of aphid population density and dam- age period on soybean yield by controlling the peroid and degree of dam- age. The results of 1988 and 1986 showed that soybean has remarkable ability of compensation and tolerance to aphid damage. The yield loss caused by aphid is relatied to the insect ensity, the lasting period, and the coincidence between damage period and soybean developmental stage. During earlier stage, light damage or heavy damage controlled immediatly can't cause reduction of the yield, and if the aphid appears later in the field, the result will be similar. However, a continiuous and heavy injury would cause 20%--30% yield loss.