Cottony cushion scale in citrus
Date: 22 Aug 2002 Author: Jianhua Mo
- 10–15 mm long.
- The complete life cycle of cottony cushion scale takes around 2 months in summer, with at least two generations occurring per year.
- The female cottony cushion scale produces up to 1000 eggs, which are carried in the fluted white cottony egg sac.
- The honeydew encourages the growth of sooty mould, which downgrades fruit quality and, in severe infestations, causes leaf drop, twig dieback and deterioration of tree health.
- Monitoring is needed most during February–March. Check five randomly selected green twigs per tree and examine each twig for the presence of adult scales with egg sac.
- If 5% of the green twigs checked are infested with one or more scales, then actions should be taken.
- Appropriate actions include spraying petroleum spray oils (PSOs), which are best applied when crawlers are most active soon after hatching (around mid to late March).