What are Red Spider Mites?
They are tiny insects (hardly visible to the naked eye) related to spiders and ticks.
When do they occur?
They generally occur during the hot and dry conditions (Mostly in summer) and multiply very quickly. Spider mite population can spread via dust during dry conditions
What do they do?
Spider mites feed by sucking the chlorophyll out of the leaves.
How do I know if my tree is infected?
Leaves of trees infested with spider mites will appear mottled yellow as more and more chlorophyll is extracted. On close inspection, you will see hundreds of little yellow spots. The leaves will also be sticky form the honeydew extruded by the mites. In certain instances, spider webs, will be noticed on the underside of the leaves. If using a magnifying glass to inspect the leaves you will see the little brown or black insects running around.
What will happen to my tree if left untreated?
Tree leaves will eventually turn brown and drop off. Tree will become weak due to the sap being drained from the plant. It is therefore not recommended to leave untreated.
How do I treat the infestation?
For small outbreaks:
- Remove and dispose the infected leaves.
- Wash down the tree with water to remove some of the dust, spider webs as well as the mites.
- Keep trees moist.
If the insect population increases to such a degree that it cannot be controlled mechanically, a chemical control will need to be applied:
- Look at using insecticidal soaps and horticultural oils.
- Liquid sulphur spray or miticides can also be considered.
- Spray above and below the leaves of the tree with the chemical treatment
For best results, the spray needs to physically come into contact with the pest.
It is recommended to do a follow-up treatment during the winter months to prevent overwintering.
