Learn | 09.25.2023

Thrips & Cannabis: How To Prevent, Treat, & Kill

In the game of cannabis cultivation, the tiny but formidable adversary known as the thrip can prove to be a persistent nuisance, jeopardizing the health and yield of your cannabis plants.

Fear not, for we are here to arm you with the essential knowledge and strategies necessary to combat this pesky foe effectively, as well as other unwelcome guests like spider mites and aphids. 

Join us on an educational journey, as we navigate the intricate battle against thrips, fostering a thriving and resilient cannabis garden for all. 

What Is A Thrip?

When you’re in the business of cannabis cultivation, encountering a thrip is almost a rite of passage for many growers. 

Belonging to the order Thysanoptera, thrips, including the western flower thrips (Frankliniella occidentalis), are small and slender creatures, measuring a mere millimeter or less in length. Their distinguishing feature? Fringed wings adorn their bodies and give them an almost mythical-like appearance under a microscope.

Equipped with piercing mouthparts, thrips feed voraciously on cannabis plant cells, leaving a wake of damage in their path. As you venture into your grow room, it’s essential to know how to get rid of these invaders proficiently. 

Let’s empower ourselves with the expertise to identify and eradicate these invaders proficiently.

How To Identify Thrips

Identifying early signs of thrip invasion is key to safeguarding your yield. Despite their tiny size, noticeable plant damage can hint at their presence before a major outbreak occurs. 

Thrips often reveal themselves through the distinct damage they inflict on plants, manifesting as silvery specks or black fecal spots on leaves. 

To confirm their presence, use a magnifying glass to inspect leaf undersides and buds, their preferred hideouts. Disturbing them might reveal their slender, winged bodies. 

Next, we’ll delve into the thrips’ life cycle to help prevent a compromised cannabis garden.

Thrips Life Cycle

Navigating the life cycle of thrips is paramount to safeguarding your cannabis plants effectively. Here’s a step-by-step breakdown of their rapid, yet menacing developmental stages: 

Egg Stage

Our journey begins at the egg stage. Thrips begin their life cycle as eggs, which are embedded in plant tissues by females, setting the stage for the forthcoming invasion. 

Larval Phases

Once hatched, the larvae feed greedily on your plants, extracting the vital cellular content, a clear indication of their burgeoning presence. 


As the narrative unfolds, we find thrips embarking on a retreat by burrowing into the soil to pupate and undergo a transformation that prepares them for their adult phase, often unnoticed until it’s too late. 

Adult Stage

The climax of the cycle unveils mature thrips from their earthen hideouts. Adult thrips resume their nefarious activities, feeding and reproducing to perpetuate a cycle that unleashes a whirlpool of destruction on your lush green sanctuary. 

Stay tuned as we venture further, equipping you with the knowledge to identify early signs of thrip damage and strategies to thwart their advances, fostering a resilient and flourishing cannabis garden.

What Does Thrip Damage Look Like?

When the clandestine assailants known as thrips decide to stake a claim on your cannabis plants, they leave behind a tapestry of telltale signs that can alert the vigilant cultivator. Here’s what to keep an eye out for: 

  • Curling or distortion of young leaves and fruits 
  • Spotted patterns on flowers 
  • Presence of yellow speckles on leaves 
  • A silvery sheen on mature leaves 
  • Black fecal spots on foliage 
  • Tiny insects lurking on the leaves undersides or within blossoms 
  • White discolored patches on leaves 
  • A noticeable pale or mottled appearance on leaves 
  • Visible damage on fruits and shoots 
  • Hindered growth progression
  • Discoloration and blemishes on flower petals 
  • Signs of wilting and evident scarring on plant parts 
  • Increased incidence of plant viral diseases 

Thrip damage can be glaring in a cannabis garden, transforming vibrant plant colors to a pale, speckled yellow hue. Flowers may lose their aesthetic appeal due to spotted and discolored petals. 

Thrips particularly target young leaves and budding fruits, causing visible curling and distortion. Older leaves don’t escape unscathed, showcasing a silvery sheen and black fecal marks as signs of thrip feeding. 

These pests not only cause physical damage but also stunt growth and potentially introduce plant viruses, threatening overall plant health. Addressing a thrip infestation promptly is, therefore, critical. 

Recognizing these signs is the first step to protect your cannabis garden. Swift action and preventative measures can maintain a healthy, bountiful garden. 

Next, we’ll discuss effective strategies to control thrip infestations.

How To Prevent Thrips On Cannabis Plants

In the quest to maintain a thrip-free cannabis garden, implementing preventive measures can be your strongest ally. Here’s a guide to establishing a robust line of defense against these tiny marauders: 

Keeping It Clean 

Adopt stringent cleanliness protocols. Clear away plant debris and dead leaves routinely, cutting off potential breeding grounds for thrips. 

Enlisting Allies 

Welcome beneficial insects like ladybugs, predatory mites, and lacewings into your garden ecosystem; they can help curtail the thrip population naturally.

Harnessing Nature’s Potions 

Utilize organic solutions such as neem oil, a potent deterrent against thrips that safeguard both your plants and the beneficial fauna in your garden. 

Fortifying With Proper Care 

Emphasize robust nutrition and appropriate watering schedules to foster healthy plants, which are inherently less prone to thrip invasions. 

Barrier Strategies 

Utilize physical barriers, such as row covers or insect netting, to block thrips’ entry, preventing them from reaching your precious plants. 

Vigilant Oversight 

Institute a regime of regular scrutiny, meticulously inspecting your plants for any early hints of thrip intrusion, facilitating swift action. 

Next, we’ll guide you through effective strategies to rid your cannabis garden of thrips, ushering in a new era of health and vitality for your plants.

How To Kill Thrips On Cannabis Plants

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Sometimes prevention isn’t enough, and a thrip invasion demands decisive action to salvage your precious crop. In such cases, knowing how to effectively kill thrips becomes an invaluable skill. Here’s a straightforward guide to sending these pests packing: 

Insecticidal Soaps 

An excellent first step, these soaps are gentle on your plants but lethal to thrips, dismantling their outer layers and leading to their eventual demise. These soaps work by breaking down the outer layers of the thrips, leading to their dehydration and death. 

Diatomaceous Earth 

Spread this fine powder, derived from fossilized algae, over your soil. Its sharp microscopic edges inflict fatal wounds on the thrips, effectively controlling their population.

Pyrethrin-Based Insecticides 

Harness the power of chrysanthemum flowers with these natural insecticides, adept at halting the life cycle of adult thrips. 

Biological Control 

Unleash natural predators like minute pirate bugs or predatory mites in your garden, offering an eco-friendly solution to your thrip dilemma. 

Neem Oil (Repeatedly) 

Revisit the use of neem oil, a formidable agent in both preventing and curtailing thrip infestations by hindering their growth and feeding patterns. 


Isolate and remove heavily infested plant areas to prevent thrips from migrating to healthier regions. 

Time is of the essence. Deploy a mix of these strategies promptly to thwart thrip invasions effectively. Stay with us as we next navigate the recovery process, guiding your plants back to their lush and flourishing state.

Combating Other Pests: Spider Mites And Aphids

Just as with thrips, your cannabis plants may fall prey to other nuisances, namely spider mites and aphids. Here’s how to manage them: 

Spider Mites 

Counter these pests with natural predators like ladybugs, use spinosad, or install sticky traps to lessen their numbers. 


Tackle these sap-sucking pests with neem oil or soap spray, and consider introducing predators such as ladybugs or lacewings for natural control.

How To Treat Plants With Thrip Damage

Emerging victorious against a thrip infestation is no small feat. Now, it’s time to nurture your cannabis plants back to their vibrant selves. Follow these steps to encourage a swift and robust recovery: 

Gentle Pruning

Begin the healing process with a gentle pruning session, carefully trimming away the heavily damaged sections to prevent further harm and facilitate new growth. 

Nutrient Boost

Revitalize your plants with a rich nutrient boost, incorporating beneficial microbes into the soil to optimize nutrient uptake and foster robust growth. 

Foliar Sprays

Fortify your plants from the cellular level with silica-containing foliar sprays, a tactic that builds resistance against future pest incursions and diseases. 

Stress Reduction

Pamper your recovering plants by optimizing their surrounding environment – think of perfect lighting, accurate watering, and suitable temperature ranges to expedite the recovery process. 

Supportive Staking

Lend a helping hand to weakened plants by using stakes or supports, assisting them in regaining their upright posture and strength.

Observation and Adaptation

Become a vigilant guardian, keeping a close eye on the recovering plants and tweaking your strategy as needed to nurture them back to health. 

As we wrap up this guide, remember that recovering from thrip damage is wholly possible with timely and appropriate action. Your cannabis garden can return to its flourishing, verdant state, ready to provide you with bountiful yields once more.

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