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aphids on [plant]
表示植物上有蚜虫时，介词用 on。
There are aphids on the rose bushes.
玫瑰花丛上有蚜虫。
蚜虫
先理解核心含义，再看它在真实句子里的用法。
蚜虫
a small sap-sucking insect that feeds on plant juices and is often a pest
There are aphids on the rose bushes.
玫瑰花丛上有蚜虫。
一种吸食植物汁液的害虫,属蚜总科。
A sap-sucking insect pest of the superfamily Aphidoidea; an aphidian.
多种小型吸食植物汁液的昆虫
any of various small plant-sucking insects
Aphids can damage plants by sucking their sap.
蚜虫通过吸食汁液损害植物。
We found aphids on the rose bushes in the garden.
我们在花园的玫瑰丛上发现了蚜虫。
You can spray water to dislodge aphids from the leaves.
你可以喷水将蚜虫从叶片上冲掉。
表示植物上有蚜虫时，介词用 on。
There are aphids on the rose bushes.
玫瑰花丛上有蚜虫。
covered in 和 covered with 都常用，强调蚜虫密密麻麻布满。
The leaves are covered in aphids.
叶子上满是蚜虫。
aphid 是可数名词，单数前需加冠词。
An aphid was crawling up the stem.
一只蚜虫正沿着茎向上爬。
Not this
There are many aphid on the rose.
Use this
There are many aphids on the rose.
aphid 是可数名词，复数形式为 aphids；在 many 后必须使用复数可数名词，所以把 aphid 改为 aphids。
Not this
Aphid is a small insect that feeds on plant sap.
Use this
An aphid is a small insect that feeds on plant sap.
aphid 是单数可数名词，不能单独作主语，前面需要不定冠词；因为 aphid 以元音音素 /æ/ 开头，所以用 an。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
蚜虫虫害
The rose bushes suffered a severe aphid infestation.
玫瑰花丛遭受了严重的蚜虫虫害。
蚜虫防治
Gardeners often use ladybirds for aphid control.
园丁常用瓢虫来防治蚜虫。
蚜虫危害
Early detection can reduce aphid damage to crops.
早期发现可以减少蚜虫对作物的危害。
蚜虫种类
This plant attracts several aphid species.
这种植物会吸引多种蚜虫。
蚜虫数量
Heavy rain can reduce the aphid population.
大雨可以减少蚜虫的数量。
Use aphid naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 aphid 看成 a + hid（藏）：想象一只小虫躲（hid）在叶背吸汁，这就是蚜虫。
语域：neutral 常见场景：农业、园艺、昆虫学 aphid 是中性词，通常用于农业、园艺或昆虫学等场景，指吸食植物汁液的小型害虫；日常口语中比较常见，可直接译为“蚜虫”。
没有常用词与 aphid 的 /ˈæfəd/ 完全押韵。acid、rapid、vapid 均以 -id 结尾，重读元音也是 /æ/，但中间辅音不同（/s/、/p/、/p/），仅算近韵；tepid 和 fluid 的元音分别为 /e/ 和 /uː/，与 /æ/ 不同。不要只看拼写推断发音。
Dictionary facts from ECDICT, WIKTIONARY.