1. Sticky Cotton: Why Are We Still Talking About It?
Peter B. Goodell
Cooperative Extension Advisor, IPM
University of California, Statewide IPM Program

2. Overview Pest problem - Why is Whitefly worse than aphid
12/29/2018
Overview
Pest problem - Why is Whitefly worse than aphid
Identification and Biology
How is this pest slipping past our radar?
Where do we go?
Is it a lack of adoption or a lack of science?

3. Whitefly Damage Direct damage to plants Honeydew formation
12/29/2018
Whitefly Damage
Direct damage to plants
Phloem feeder
Extract nitrogen from plant sap
Honeydew formation
Excess sugars passed
Accumulate on plant tissue
Sooty mold
Virus transmission

4. Sugars Found on Cotton Lint
Hequet et al

5. Sweet Potato Whitefly Bemisia tabaci Biotype B
Silverleaf (B. argentifolii)

6. Greenhouse Whitefly
Trialeurodes vaporariorum

7. Banded Winged Whitefly
Trialeurodes abutilonia

8. Whitefly Life Cycle

9. Whitefly Population Dynamics

11. Whitefly Population Development
Developmental thresholds established 1985
Lower Development: 50 F
Upper Development: 90 F
Number DD required for generation: 569
Average number of generations in:
El Centro: 13.7
Five Points: 8.8

12. It’s All About Population Management
Manage here, so population does not become a problem here

13. Management Scenarios IGRs Selective AIs Neo-nics Semi-selective AIs
Initial buildup -
July in most years
Low population but building
Control nymphs and adults
Gradual Invasion by adults
August
No or few bolls open
Adults fly in
Melons, tomatoes, other sources?
Lint exposed
Heavy migration pressure
Other cotton fields, tomatoes, melons
September/October
IGRs
Selective AIs
Neo-nics
Semi-selective AIs
Pyrethroid, OP
Broad spectrum

14. Why is This Still a Problem?
Are we missing something? Or
Are we just not doing what we should?

15. Are We Missing Something?
12/29/2018
Are We Missing Something?
We use AZ guidelines
Are they appropriate for Pima/Acala in SJV?
More research and field studies?
Who and how?
Research is difficult
Research is expensive
Research requires infrastructure

16. Are We Not Doing What We Should?
12/29/2018
Are We Not Doing What We Should?
A few players are not following the program
Too difficult
Too expensive
No consequence?

17. 12/29/2018
Parting Remark
It’s your reputation, protect it

18. Thank You for Your Attention
Kaweah Range
Sequoia NP