In this study, we examined the effect of weather and moon illumination on sand fly activity, as measured by light trap collections made between 2 May 2003 and 25 October 2004 at Tallil Air Base, Iraq. Wind speed, temperature, dew point, percentage of sky cover, and moon illumination were entered into principal components analysis. The resulting principal components were entered into stepwise regression to develop a model of the impact of the weather on sand fly collections. Wind speed, percentage of sky cover, and moon illumination each had a strong inverse relationship with the number of sand flies collected, whereas temperature displayed a direct relationship to sand fly collections. Our data indicate that sand fly light trap catches at Tallil Air Base are highest on warm, clear nights with low wind speed and minimal illumination from the moon.
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