Cannabis

Aphids

Aphids pose a significant challenge in cannabis cultivation, with several prominent species specifically affecting the crop. Notably, the Cotton aphid (Aphis gossypii), the Potato aphid (Macrosiphum euphorbiae), the Green peach aphid (Myzus persicae), the Cannabis aphid (Phorodon cannabis), and the Rice root aphid (Rhopalosiphum rufiabdominale) are among the key aphid species that can infest cannabis plants. These pests have the potential to cause substantial damage, as they feed on the plant's sap and reproduce rapidly. Their feeding activities can lead to stunted growth, distorted leaves, and even the transmission of viral diseases.

Leaf miners

Leaf miners are a challenge to cannabis crops, and several species stand out as significant pests. Tomato leaf miner (Liriomyza bryoniae), Pea leaf miner (Liriomyza huidobrensis), and American serpentine leaf miner (Liriomyza trifolii) are among the most notorious leaf miner species affecting cannabis. These tiny insects lay their eggs in cannabis leaves, and the larvae that hatch proceed to tunnel through the leaf tissue, creating distinctive winding mines that can severely damage the foliage. As a result, the plant's ability to photosynthesize and produce energy is compromised, leading to reduced yields and overall weakened cannabis plants.

Mealybugs

In some cases mealybugs can be a problem in cannabis. These small, soft-bodied insects feed on the sap of cannabis plants, causing stunted growth and yellowing of the leaves. Their waxy, cotton-like appearance makes them easily recognizable on the plant surfaces. Mealybug infestations can weaken cannabis plants and impact overall yields.

Caterpillars

Caterpillars can present significant challenges to cannabis cultivation, with various species wreaking havoc on the plants. Two particularly notorious pests are the Hemp moth (Grapholita delineana) and the Beet armyworm (Spodoptera exigua). The presence of Grapholita delineana caterpillars often leads to the manifestation of bud rot and decreased yield, as they tunnel into developing flower buds, leaving them susceptible to fungal infections. On the other hand, the voracious appetite of the Spodoptera poses a threat as they defoliate cannabis plants, weakening their overall health and vitality.

Thrips

Thrips pose a persistent threat to cannabis crops, with species like Western flower thrips (Frankliniella occidentalis), Onion thrips (Thrips tabaci) and Impatiens thrips (Echinothrips americanus) causing notable concern. These tiny insects have the potential to inflict substantial damage by puncturing plant cells and feeding on the sap, ultimately stunting growth and causing deformities in leaves and flowers.

Whitefly

Whitefly can be highly problematic in cannabis, with two notable species of concern being the Tobacco whitefly (Bemisia tabaci) and Greenhouse whitefly (Trialeurodes vaporariorum). These small, winged insects feed on cannabis plants by piercing the phloem and extracting sap, leading to yellowing, wilting, and reduced plant vigour. Whitefly infestations can cause significant damage, hinder plant growth, and ultimately impact yields. Furthermore, whiteflies are known to secrete honeydew, promoting the growth of sooty mold that further interferes with photosynthesis.

Plant bugs

Lygus spp. pierce through plant tissues and feeds on the sap, causing distorted growth and blemished leaves in cannabis crops. Furthermore, its feeding behavior can lead to the development of necrotic spots and reduced flower quality.

Spider mites

Tetranychus urticae, also known as the Two-spotted spider mite, inflicts considerable harm to cannabis crops by piercing plant cells and extracting essential fluids, resulting in stippled leaves, webbing, and a general decline in plant health. These mites are notorious for their rapid reproductive rates, enabling them to swiftly multiply and overrun cannabis crops.

Other pest mites

Russet mites, such as the Hemp russet mite (Aculops cannabicola) are troublesome pests within the Eriophyidae family, which have a notable impact on cannabis plants. Aculops cannabicola infests cannabis crops, leading to distorted growth, necrosis, and decreased yields. The Broad mite (Polyphagotarsonemus latus) is a mite of the family Tarsonemidae and can also be a severe problem in cannabis crops.

Fungus gnats

Fungus gnats or Sciarid flies can wreak havoc on cannabis plants, particularly in indoor growing environments. Fungus gnats like Bradysia impatiens are small flies that lay their eggs in damp soil. Their larvae feed on organic matter in the soil and can damage the roots of cannabis plants, leading to stunted growth and decreased vigour. The presence of these pests can also increase the risk of fungal diseases. Sciaridae species share similar habits and can contribute to the overall stress and reduced health of cannabis plants.

Thrips control

Biological pest control of thrips in cannabis can be achieved effectively through the use of various biocontrol agents. Predatory mites such as Amblyseius swirskii (Swirski-Mite, Swirski Ulti-Mite) are valuable allies in thrips management, as they feed on thrips eggs and larvae. Isaria fumosorosea (Isarid) a biological pesticide, can be applied to target thrips populations and inhibit their growth. For additional control, predatory bugs such as Orius laevigatus (Thripor-L) and Orius insidiosus (Thripor-I) can be introduced, as they feed on thrips at different stages of development.

Fungus gnat control

In the realm of cannabis cultivation, biological solutions have emerged as effective allies in combatting the challenges posed by sciarid flies. Among these innovative products, the entomopathogenic nematode Steinernema feltiae (Entonem) targets fungus gnat larvae. This microscopic predator actively seeks out and infects its host, effectively reducing the pest population. Similarly, the predatory mite Stratiolaelaps scimitus (Entomite-M) preys on fungus gnat larvae, further controlling their numbers. The predatory beetle Atheta coriaria (Atheta) offers an additional layer of defense by feeding on the larvae present in the growing medium. Adding to this arsenal is Isaria fumosorosea (Isarid), a biological pesticide that utilizes Isaria fumosorosea to naturally eliminate fungus gnats.

Spider mite control

Biological pest control of spider mites in cannabis crops can be achieved effectively through the use of beneficial predatory organisms. Several biocontrol agents have shown efficacy in controlling spider mite populations. Neoseiulus californicus (Spical, Spical Ulti-Mite) and Phytoseiulus persimilis (Spidex, Spidex Boost, Spidex Vital, Spidex Vital Plus) are predatory mites that target and feed on spider mites, including species like Two-spotted spider mite (Tetranychus urticae). These predatory mites actively seek out spider mite colonies and consume them, helping to reduce their numbers and prevent further damage to the cannabis plants.

Aphid control

Biological pest control is an effective approach to managing aphid infestations in cannabis crops. Several beneficial organisms are utilized as biocontrol agents to suppress aphid populations. Parasitic wasps, including Aphidius colemani (Aphipar), Aphidius matricariae (Aphipar-M), Aphidius ervi (Ervipar) parasitise and control aphid populations by laying eggs inside aphids. Chrysoperla carnea (Chrysopa, Chrysopa-E), commonly known as the green lacewing, is another beneficial insect that feeds on aphids at various life stages. The biological pesticides Lecanicillium muscarium Ve6 (Mycotal) and Isaria fumosorosea (Isarid) infect and kill aphids, contributing to population reduction.

Whitefly control

Biological pest control of whiteflies in cannabis crops can be achieved through the use of various biocontrol agents. Amblyseius swirskii (Swirski-Mite, Swirski Ulti-Mite) are predatory mites that feed on whitefly eggs and nymphs, providing long-term suppression. Lecanicillium muscarium Ve6 (Mycotal) and Isaria fumosorosea (Isarid), biological pesticides, can be applied to target whitefly populations and disrupt their development. The parasitic wasps Encarsia formosa and Eretmocerus eremicus (Enermix) that parasitise whitefly nymphs, and the predatory bug Macrolophus pygmaeus (Mirical) effectively control whitefly populations.

Russet mite control

Predatory mites offer a promising approach to tackle russet mites. Amblyseius swirskii (Swirski-Mite, Swirski Ulti-Mite) and Neoseiulus californicus (Spical, Spical Ulti-Mite) not only consume these harmful arachnids but also prevent their population from spiraling out of control. With their voracious appetites for pests, these predatory mites serve as natural biocontrols, maintaining a balanced ecosystem within the cannabis environment.

Caterpillar control

The use of beneficial nematodes, including Steinernema carpocapsae (Capsanem), has proven to be successful in controlling caterpillar populations. These nematodes are entomopathogenic, meaning they infect and kill the caterpillars. Once applied, the nematodes actively seek out the caterpillar larvae, penetrate their bodies, and release bacteria that quickly multiply, leading to the demise of the pests. Beneficial nematodes are highly effective in controlling caterpillar populations due to their unique biological characteristics. This method of biological control is highly targeted, as the nematodes specifically seek out caterpillar hosts, making them efficient and environmentally friendly agents in reducing caterpillar populations.

Leaf miner control

Several biocontrol agents have proven to be beneficial in suppressing leaf miner populations in cannabis crops. The parasitic wasps Diglyphus isaea (Miglyphus) and Dacnusa sibirica (Minusa), are effective natural enemies of leaf miner larvae and the predatory bug Macrolophus pygmaeus (Mirical) contributes to the management of leaf minre larvae.

Cannabis crops can be susceptible to various fungal and bacterial pathogens. These pathogens can cause significant damage to the plants, leading to reduced yields and quality. Fungal diseases, such as Botrytis spp., Fusarium wilt, Phytophthora spp., Powdery mildew and Pythium spp., pose serious threats to cannabis cultivation. These fungal infections can spread rapidly under favourable conditions and impact the overall health of the crop. Disease management in cannabis crops requires preventive measures to mitigate the impact of these diseases and ensure a successful cannabis harvest.

Trichoderma harzianum (Trianum) is a beneficial fungus that can be used in cannabis cultivation to prevent and control diseases. This fungus is known for its ability to colonize the roots of plants and produce enzymes that degrade harmful fungi in the soil, that cause root rot and other diseases. By promoting the growth of Trichoderma in the soil, growers can improve the overall health and resilience of their cannabis crops, reducing the need for chemical fungicides. Trichoderma harzianum (Trianum) can be applied to the soil or as a foliar spray to prevent and control diseases.