自然天敌控制小麦蚜虫的效果观察

田间试验表明：麦蚜天敌对小麦蚜虫的控制作用比较明显，其中七星瓢虫和草间小黑蛛为优势种，控制效果分别为28.5%和 23.2 %。采取充分发挥自然天敌的控制作用、高峰期辅以化学防治的综合治理策略，可有效地压低虫口基数，把蚜虫控制在穗前，以减轻蚜虫对小麦的为害。

Observation Effect of Natural Enemy on the Control of Aphid in Wheat Field

The experimental result showed that the natural enemy had obvious effect on the control of aphid in wheat field, especially for ladybug and spider, which control efficiency were 28.5% and 23.2% respectively. The strategy of the application of natural enemy combining with the chemical method at peak of aphid occurrence was effective for the reduction of basic number of aphid. And the damage to wheat yield from aphid would be reduced under the condition of the control of aphid before heading stage.