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ViewAttendees 4

P-IE

Student Competition 10-Minute Paper

Grad 10-min: P-IE, Chemical Ecology 2

Exploring new areas of integrated pest management for mites on roses: predatory mites and systemic acquired resistance

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Student Competition On-Demand
The rose-feeding mite Phyllocoptes fructiphilus, vectors the rose rosette virus (RRV), causing millions of dollars of losses, threatening the US rose industry. There are no resistant cultivars, and growers manage RRV with miticides and removing plants. We conducted a survey of mites on roses in the Florida landscape and detected a localized outbreak of P. fructiphilus. This state record underscores the need to develop new, integrated control methods for P. fructiphilus management. Preliminary testing of predatory mites demonstrated that Ambyseius swirskii, Athias-Henriot (Mesostigmata: Phytoseiidae) were attracted to RRD-infected roses, an attraction which correlates with low levels of Methyl Salicylate (MeSA), and an increase in limonene released from infected plants. MeSA is associated with Salicylic Acid, a plant hormone involved in activating a plant’s Systemic Acquired Resistance (SAR) to pathogens. Furthermore, field data suggest that SAR-induction of roses reduces populations of herbivorous mites, including P. fructiphilus. This control appears to be enhanced when combined with A. swirskii release. These findings suggest a relationship between RRD and SAR which may be allowing P. fructiphilus to overcome plant defenses