marijuana spider

Most Common Pests In Cannabis: Spider Mites

Spider mites are the most common pest in cannabis. These bugs live in dirty indoor and outdoor grow spaces where they feed on chlorophyll and sap, webbing all over your precious plants.

1. What Are Spider Mites?

Spider mites are common in cannabis, these small mites hide inside the buds, sucking the liquid in your plants and leaving webs all over. It’s fairly easy to eliminate them but make sure you spot them early because they can rot the buds, ruining your entire harvest really fast.

These tiny mites are related to spiders, ticks, and other small tetranychidae. They are a very common bug that attacks cannabis, seeking dark places in plants where they can lay eggs and continue to reproduce.

2. What Do Spider Mites Look Like?

These bugs are actually super tiny (around 0.5mm). They can be red or black and have 8 legs.

Because they’re so tiny, you’ll only be able to see tiny dots walking around your plant unless you have a 10x microscope available.

3. Where Are They Found?

Spider mites can be found walking all over the plant but you’ll usually find them on the underside of the fan leaves.

That’s where they lay their eggs, protecting them from the sun and other elements that may affect them.

4. What Do Spider Mites Do?

These mites feed not only on sap but also on chlorophyll, damaging the plant. Even though this can have a toll on your plant, this is not the worst they can do.

Spider mites can reproduce super fast and will use their web to protect their eggs. This means they will completely cover your plant in spider web if you don’t deal with them early.

They can even lay eggs inside the buds and when the eggs hatch, they will start eating the inside of your bud, causing bud rot.

Even though the webbing won’t kill your plant, it will be impossible to remove it if you’re in the flowering stage as it can get stuck in the flowers.

So although it doesn’t kill your plant, you will have to throw it away if you get seriously infested when flowering.

5. Spider Mites Symptoms

The symptoms you’ll see with spider mites are just signs of their presence. The first thing you see is tiny yellow or white spots, these are mites’ bite marks and they are a sign that they are feeding on your plant.

After that, you will start to see small transparent eggs stuck under the stems and leaves, this is a sign that the infestation is starting to grow.

If left untreated for around a week, you’ll see what they can do. You will start to see webbing all around your plant and you’ll be able to see the mites walking all over your plant.

6. How To Prevent Them?

Although like with other pests like Mealy bugs, there is nothing you can do to avoid them 100% other than keeping a good growing environment. Keeping your growing space clean and quarantine clones (or other plants) before bringing them in with your plants is a good way to prevent them.

Because spider mites don’t like wind, keeping a well ventilated growing room can be an effective way to prevent them also.

If you want to do everything you can to prevent them, you could slightly spray insecticides to prevent their appearance but this can affect your plant.

But the best way really is to keep your space clean, with the appropriate temperature, humidity and ventilation.

7. How To Deal With Them?

If spotted in the early stages, it can be fairly easy to remove the eggs manually or with a high-pressure sprayer to knock them down. After you remove the excess, you can apply Neem oil or a mix of alcohol and water to eliminate the rest.

Now if your plant is being taken over, it can be difficult, because they can cause bud rot and can hide inside the buds.

You will have to make the hard decision of completely eliminating them by applying harsher chemical products, with the risk of damaging your plant or applying organic and safer-to-use insecticides daily, with the risk of losing your plant to spider mites.

If your plant is severely affected, the best thing to do is throw the plant out to avoid them spreading to your other plants.

8. In Conclusion

Spider mites are the worst bugs that can attack your plant. Even though they don’t feed on the roots or something more serious like Fungus gnats, they can lay eggs inside the buds, being able to compromise the entire main cola.

Their webbing can also get stuck to the trichomes on the buds and it will be impossible to remove them completely, affecting yields and quality.

As with all other pests, we recommend checking your plants every day and take action as soon as you see any sign of bugs.

Spider mites are the most common pest in cannabis. These bugs live in dirty indoor and outdoor grow spaces where they feed on chlorophyll and sap, webbing all o

Nasa gave spiders DRUGS – how their webs changed when high on weed, LSD and caffeine

Some of the stoned spiders gave up halfway while others spun their webs frantically – check out their wacky designs for yourself

  • By Saqib Shah
  • 17 Jan 2020, 16:53
  • Updated : 17 Jan 2020, 16:56

NASA once fed spiders drugs like LSD and marijuana and then watched as the stoned bugs made “deformed” webs.

The space agency published the results of its bizarre experiment in 1995 – and they were as fascinating as you’d expect.

You can see the abstract creations below, including webs weaved by spiders high on marijuana, LSD, caffeine and chloral hydrate.

“The more toxic the chemical,” wrote the researchers in their paper, “the more deformed a web looks in comparison with a normal web.”

They then quantified the alterations in each web using statistical tools and image processors to test the impact of different chemicals on spiders.

Check out the results for yourself in the pictures below:

Spiders exposed to LSD

Spiders given low doses of LSD – a class A drug in the UK that can land you up to seven years in prison for possession – made more geometrically regular patterns than when they were sober.

The same can’t be said for the creepy crawlies given the other drugs.

Spiders exposed to marijuana

This stoned spider seems to have given up on its web halfway through.

Nasa said the spiders who sampled the drug were easily sidetracked while building and left their webs unfinished.

They didn’t say whether they had the munchies too.

Spiders exposed to chloral hydrate

The spiders fed chloral hydrate gave up on their webs even faster than the ones who’d had a little cannabis.

That may be because the chemical is a sedative that’s used for the short-term treatment of insomnia in humans.

Spiders exposed to caffeine

A cup of coffee may wake you up in the morning, but it plays havoc on spiders.

The webs they made were characterised by disorganised cells and a lack of the normal “hub and spoke” pattern, according to Mental Floss.

Spiders exposed to Benzedrine

These webs had large gaps as the spiders weaved them energetically without planning or attention to detail.

Surprisingly, scientists have been getting spiders intoxicated since the late ’40s.

Back in 1948, zoologist H.M. Peters had been staying up all night in an effort to research the web-spinning abilities of orb-web spiders.

He then roped in pharmacologist Peter N. Witt to help him find a solution.

Most read in tech







It was Witt who decided to feed the spiders sugar water spiked with caffeine, mescaline, amphetamine, LSD or strychnine – a toxic chemica used in pesticides – in an effort to make them weave at a different time of the day.

NASA replicated Witt’s original study in 1995 and found similar results. The only difference was the astronomers used house spiders as part of their analysis and modern computing tools to dissect the outcome.

We pay for your stories! Do you have a story for The Sun Online news team? Email us at [email protected] or call 0207 782 4368 . We pay for videos too. Click here to upload yours.

More from The Sun


Boris Johnson ‘furious’ at being ‘bounced’ into 2nd lockdown, says minister


Shoppers furious as Tesco in England fences off ‘non-essential’ aisles


Harry’s wreath lays unused after Palace ban it being placed at Cenotaph


How to claim free school meal vouchers for Christmas, Easter and summer holidays


Man who visited pal for a cup of tea is issued with £200 Covid fine

Follow The Sun


  • Sign Up To The Sun
  • About Us
  • Editorial Complaints
  • Clarifications and Corrections
  • News Licensing
  • Advertising
  • Contact Us
  • Commissioning Terms
  • Help Hub
  • Topic A-Z
  • Cookie Settings
  • Contact Preferences

©News Group Newspapers Limited in England No. 679215 Registered office: 1 London Bridge Street, London, SE1 9GF. “The Sun”, “Sun”, “Sun Online” are registered trademarks or trade names of News Group Newspapers Limited. This service is provided on News Group Newspapers’ Limited’s Standard Terms and Conditions in accordance with our Privacy & Cookie Policy. To inquire about a licence to reproduce material, visit our Syndication site. View our online Press Pack. For other inquiries, Contact Us. To see all content on The Sun, please use the Site Map. The Sun website is regulated by the Independent Press Standards Organisation (IPSO)

Our journalists strive for accuracy but on occasion we make mistakes. For further details of our complaints policy and to make a complaint please click here.

NASA once fed spiders drugs like LSD and marijuana and then watched as the stoned bugs spun "deformed" webs. The space agency published the results of its bizarre experiment in 1995 – and they were as fascinating as you'd expect.