1. Online tools for the control of red scale and citrus gall wasp
Jianhua Mo
NSW Department of Primary Industries

2. Red scale – the problem

3. Red scale - lifecycle

4. Red scale – timing – why?
Many chemicals (spray oil, chlorpyrifos, pyriproxyfen (Admiral®), buprofezin (Applaud®) ) target scales at the crawler and whitecap stages
Aphytis prefers to parasitize virgin females

5. Red scale – timing – why?

6. Red scale – seasonal patterns – adult male
Jul
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Male flight – Riverina – 2017/2018
* Calendar dates estimated from temperature data in Yanco during 2017/18

7. Red scale – seasonal patterns – crawlers
* Calendar dates estimated from temperature data in Yanco during 2017/18

8. Red scale – population model

9. Red scale – Prediction
Online prediction tool

10. CGW – the problem

11. CGW - lifecycle

12. CGW – timing – why?
Adult wasps are the only visible stage and they are out for 3-4 weeks only in a year
Methidathion is most effective against newly hatched larvae

13. CGW – adult emergence & egg hatch by date (5% - 95%)
Male flight – Riverina – 2017/2018
Adult emergence
Egg hatch

14. CGW – adult emergence & egg hatch by degree-days
Red dashed lines: 5 – 95%

15. CGW– Prediction
Online prediction tool

16. CGW– Prediction

17. THANK YOU Acknowledgements
This presentation is based on projects CT15006 and CT15008 funded by Hort Innovation using the citrus research and development levy and funds from the Australian Government. NSW Department of Primary Industries (NSW DPI) provided in-kind support to the projects.
THANK YOU