Are the small black insects on my zucchini leaves squash bugs?

What's likely going on

From the photo, the insects on the zucchini leaves are small, narrow, and dark. They do not look like the usual squash bug, which is a larger, flat, gray‑brown, shield‑shaped insect with orange‑edged nymphs.

They look more like small plant bugs or thrips:

• Thrips / tiny plant bugs: very slim, fast‑moving; suck sap and can cause silvery streaking or speckling on leaves.
• Some similar insects are mostly harmless or even mildly beneficial, feeding on other tiny pests.

Because the picture doesn’t show close detail, it’s hard to be exact, but there’s no sign here of classic squash bug clusters or their bronze, football‑shaped egg masses on the leaves.

Diatomaceous earth (DE) can kill many soft‑bodied insects, but it’s non‑selective: it also harms beneficial insects and only works while dry and in direct contact.

What to do

1. Check for damage first
   Look for silvery streaks, yellow speckling, curling leaves, or deformed new growth. If the leaves look mostly healthy, you may not need to do anything.

2. Get a closer ID
   If possible, take a clear close‑up of one insect from the side and from above. Compare to pictures of squash bugs vs thrips vs assassin/plant bugs.

3. Use water as a first step
   If numbers are high, spray the leaves (especially undersides) with a firm jet of water in the morning to knock them off. Repeat every couple of days.

4. Hand removal
   For larger or slower bugs, shake or tap them into a container of soapy water.

5. Be cautious with DE and sprays
   If you decide to use DE, dust lightly on soil and lower stems, not over the whole plant, and avoid flowering parts so pollinators aren’t hit. Reapply only after rain. Keep pets and kids from breathing the dust.

How to prevent it

• Keep plants vigorous with consistent watering and a bit of compost so they outgrow light feeding.
• Avoid over‑fertilizing with high‑nitrogen products, which attracts sap‑sucking pests.
• Remove plant debris around the base where insects can hide.

When to worry

• Leaves develop heavy silvering, bronzing, or curling, and new growth is stunted.
• You see lots of insects plus brown, crispy, or collapsing leaves.
• You start seeing the classic squash bug adults or their bronze egg clusters.

If that happens, step up control (daily hand‑picking and checking for eggs) and consider more targeted organic options for the specific pest you’ve identified.