Submitted to: Entomological Society of America Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: 9/30/2010
Publication Date: 11/1/2010
Citation: Serikawa, R.H., Okuma, D.M., Backus, E.A., Rogers, M.E. 2010. Effects on Asian Citrus Psyllid (Diaphorina citri Kuwayama) feeding behavior of fenpropathrin and chlorpyrifos within 24 hours of application. Entomological Society of America Annual Meeting, Dec 12-15, 2010, San Diego, CA. Available: http://esa.confex.com/esa/2010/webprogram/Paper50071.html. Interpretive Summary:
Technical Abstract: Huanglongbing (HLB), also known as citrus greening disease, is one of the most destructive diseases affecting citrus production. The phloem-limited bacterium associated with HLB is transmitted by the Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Psyllidae). One component of HLB management is the use of insecticides to slow the rate of pathogen spread by reducing vector populations. However, efficacy of pesticide applications in preventing inoculation of healthy plants with the HLB pathogen via disruption of psyllid feeding behaviors is undetermined. In this study, the effect of two foliar insecticides on D. citri feeding behavior was examined using an Electrical Penetration Graph (EPG) monitor. The first insecticide evaluated was a pyrethroid (Danitol 2.4 EC), and the second was an organophosphate (Lorsban-4E). Psyllids were recorded on young leaves. Untreated sweet orange plants were used as controls in both experiments. The psyllid feeding access period was 6 h on pyrethroid-treated plants, and 12 h on the organophosphate-treated plants. Non-sequential feeding parameters were analyzed by ANOVA (PROC GLIMMIX, SAS Institute 2001). Results showed that psyllids on Danitol-treated plants probed only briefly without reaching phloem, suggesting that the HLB pathogen would not be acquired or inoculated. In contrast, pysllids on Lorsban-treated plants probed readily and did not exhibit behaviors different from insects on non-treated control plants.