Dăunătorul este pe tulpină.

Because Romanian usually puts the definite article at the end of the noun, not in front of it like English does.

• dăunător = pest
• dăunătorul = the pest

So -ul here is the masculine singular definite article.

It can be both.

• As a noun, dăunător means pest.
• As an adjective, it means harmful or damaging.

In Dăunătorul este pe tulpină, it is clearly a noun: the pest.

Este means is. It is the 3rd person singular form of a fi (to be).

Yes, in everyday Romanian, e is very common:

• Dăunătorul este pe tulpină.
• Dăunătorul e pe tulpină.

Both are correct.
Este sounds a bit more full or formal; e is more natural in casual speech.

Here, pe means on.

So:

• pe tulpină = on the stem

English speakers often learn that pe can also mark certain direct objects, especially people, but that is not what is happening here. In this sentence, it is simply a preposition of location.

Tulpină usually means a plant’s stem or stalk.

Depending on context, English might translate it as:

• stem
• stalk

So in a plant or gardening context, pe tulpină means on the stem / on the stalk.

This is a very good question, because English often expects the here.

Romanian often leaves a noun without the definite article in prepositional phrases, especially in descriptive, technical, or general statements about location.

So:

• pe tulpină = literally on stem, but in natural English it may be translated as on the stem
• pe tulpina = on the specific stem

If you want to make the stem clearly specific, Romanian often adds more detail, for example:

• pe tulpina plantei = on the plant’s stem

So the version without the article is normal and natural in many contexts.

• dăunătorul is masculine singular definite
• tulpină is feminine singular

This matters because Romanian nouns and adjectives often show gender and number agreement.

For example:

• dăunătorul mic = the small pest
• tulpina verde = the green stem

The most neutral word order here is:

• Dăunătorul este pe tulpină.

That is basically:

• Subject + verb + location

Romanian word order is fairly flexible, though. You can move things around for emphasis:

• Pe tulpină este dăunătorul.

This sounds more marked, as if emphasizing where the pest is.

So the original sentence is the most straightforward and natural version for a learner.

A rough pronunciation guide is:

duh-oo-nuh-TOH-rul ES-te pe tool-PEE-nuh

A few useful notes:

• ă is like the a in sofa
• e in este is a clear eh
• i in tulpină is like ee in see, but shorter

If you want a more exact IPA-style pronunciation, it is approximately:

/də.u.nəˈto.rul ˈes.te pe tulˈpi.nə/

You would usually say:

• Un dăunător este pe tulpină.

Here:

• un dăunător = a pest

In real conversation, Romanian may also use:

• Este un dăunător pe tulpină.

That version can sound a bit more like There is a pest on the stem.

It can refer to any harmful organism in context, not only an insect.

In agriculture or gardening, dăunător can mean:

• an insect pest
• a parasite
• another organism that damages the plant

So the exact type of pest depends on the situation, not on the word alone.