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United States Department of Agriculture

Agricultural Research Service

Title: The Effect of Wind Speed on Dispersal of Bacteria from Canker-Infected Citrus Trees

item Bock, Clive
item Parker, Paul - USDA-APHIS
item Gottwald, Timothy

Submitted to: Phytopathology
Publication Type: Abstract Only
Publication Acceptance Date: September 9, 2003
Publication Date: June 1, 2004
Citation: Bock, C.H., Parker, P., Gottwald, T.R. 2004. The effect of wind speed on dispersal of bacteria from canker-infected citrus trees. Phytopathology. 94:S9.

Technical Abstract: The effect of wind speed on dispersal of citrus canker (<i>Xanthomonas axonopodis pv citri</i>) was investigated. Wind was simulated with an electric fan to produce winds of 0 [control], 4, 6 and 15 ms<sup>-1</sup> at the canopy face. Spray generated by nozzles was used to simulate rain, and was fed into the wind 1 m upwind of (and directed at) the inoculum source. Samples were taken using panel (at 1, 2, 3 and 5 m) and funnel samplers (at 0, 1 and 2 m) downwind from the inoculum source. Bacteria were deposited at all distances, but most were deposited 1 m downwind (86% of the sample at 1 m vs <1 % at 5 m). Greater wind speed increased the quantity of bacteria deposited at all distances. At 1 m downwind and no wind, 6,168 bacteria were deposited on the panels, but at 15 ms<sup>-1</sup> over 320,700 were deposited. The concentration of bacteria rose from 9 to 138 ml<sup>-1</sup>, respectively. The results show that greater wind speed increases the quantity of bacteria dispersed. The effect of wind speed on dispersal of <i>X. axonopodis pv citri</i>) is relevant where storms with strong winds can increase wind blown inoculum (as in Florida).

Last Modified: 4/19/2015
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