After about 8 months , the citronella loses its punch .

大约八个月之后，香茅失去了功效。

They 've made cardboard food cartons coated with a substance called citronella oil , which is extracted from grass .

他们在纸装食品的纸盒包装表面涂上一层名叫香茅油的物质，这种物质是从草中萃取得到的。

And past research has shown that bugs avoid the stink of citronella , along with the smells of other plant extracts , such as garlic and pine needles .

过去的研究表明，小虫避开香茅的恶臭味，但是趋向于其他植物如大蒜和松针的萃取物。

Botanical products that contain citronella , eucalyptus oil or melaleuca oil do repel mosquitoes , but only for very short period of time , and you have to reapply four times as frequently as a low-dose deet-based repellent , webb says .

包含香茅油、桉叶挥发油或茶树精油的植物学产品的确能驱逐蚊子，但是持续时间很短，韦伯说，对于小剂量的deet防护剂，你需要重复使用四次。

Consider tiki torches , colorful jars with tea lights , umbrellas to provide shade from the sun and tall vases or buckets with daisies , sunflowers or roses for table center pieces . Light citronella candles to keep mosquitoes at bay .

建议用提基火把、色彩鲜艳的图案装点茶灯；摆放遮阳伞；用高花瓶或是高桶插上雏菊、太阳花或者是玫瑰做餐桌摆放；点上香茅油驱蚊。