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ViewAttendees 4

P-IE

Section Symposium

Fundamental Biology to Practical Management of Ambrosia Beetles in Horticultural Tree Agroecosystems

8: Can we control ambrosia beetles as well as Phytophthora root rot using fungicides and biofungicide on plants exposed to flooding?

Tuesday, November 17, 2020
2:00 PM - 2:15 PM EST
Livestream
Trees in ornamental nurseries are often exposed to a variety of stressors including flooding. Flooding or high levels of soil moisture increases susceptibility of trees to Phytophthora root rot caused by the oomycete pathogen Phytophthora cinnamomi. Flooding also is an important stressor that induces ambrosia beetle attacks in ornamental nurseries. In this study, preventively- or curatively-applied fungicides and biofungicide were evaluated for control of Phytophthora root rot and ambrosia beetles on containerized flowering dogwoods (Cornus florida) exposed to simulated flood events under field conditions. Dogwood plants artificially inoculated with P. cinnamomi were flooded by maintaining standing water for 1, 3, or 7 days. Longer flooding periods increased Phytophthora and ambrosia beetle damage requiring higher demand for effective treatments. Preventively applied Orkestra Intrinsic and Subdue MAXX were effective at reducing Phytophthora and ambrosia beetle damage. These results can help nursery producers successfully manage Phytophthora root rot and also reduce the risk of ambrosia beetle attacks during flood events.