Why pests are a serious problem
Cannabis plants are susceptible to pests such as aphids, spider mites and fungus gnats. These parasites weaken the plant, reduce the yield and can even cause it to die. Many growers underestimate the danger – until it is too late.
Assumption checked: “Pests are only a problem when plants are poorly cared for.”
Counterargument: Even optimally cared for plants can be infested, e.g. by contaminated soil or other plants in the vicinity.
The most common pests at a glance
1. spider mites
- Detection: Tiny cobwebs on the undersides of leaves, yellow dots on leaves.
- Risk: Suck out plant sap, lead to leaf loss.
2. aphids
- Detection: Green/black insects on stems and leaves, sticky honeydew.
- Risk: Transmit viruses and attract ants.
Alternative perspective: Some pests (such as ladybug larvae) are natural predators – not all insects are harmful!
Natural control methods
Chemical pesticides can pollute the plants. Better:
- Neem oil: Disrupts the hormone balance of pests.
- Beneficial insects: Use lacewings or predatory mites.
- DIY spray: water + washing-up liquid + alcohol (be careful with the dosage!).
Logic gap: “Natural = always safe.”
Criticism: Home remedies can also burn leaves if overdosed. Always test on a small area first!
Prevention is the best protection
- Air circulation: Pests do not like draughts.
- Checks: Inspect undersides of leaves weekly.
- Quarantine: first observe new plants in isolation.
Assumption questioned: “Pests only occur outdoors.”
Fact: Indoor growers are also affected, e.g. by soil brought in.
When is professional help needed?
In the case of severe infestation (e.g. completely spun plants) or if home remedies fail, biological pesticides (e.g. Bacillus thuringiensis) should be used.