Abstract
Seasonal activity of the sweet potato whitefly (SPWF), Bemisia tabaci (Gennadius), was monitored weekly in the Imperial Valley and lower Colorado desert region of California in 1984. Numbers of SPWF caught on traps placed ca. 20 m inside a cotton field were significantly correlated to numbers of SPWF caught on traps located at the perimeter of the cotton field and also on traps 0.4 km away. Although the number of SPWF caught on traps located in the desert was considerably lower than those in the Imperial Valley, seasonal trends between the two regions were highly correlated. SPWF populations exhibited an exponential increase in all locations, and time-series analyses showed that there were no discernible time-lags in population trends from the different areas sampled.
Published Version
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