Parthenium pollen occupied a small portion of herbaceous aeropollen flora of Corpus Christi, Texas, U.S.A. (Lewis et al., 1990). An aeropollen survey was carried out by them in 1988 by using a Burkard seven-day volumetric sampler. Graphic representation of ambient pollen of Parthenium is given in Fig. 14.2.
Parthenium appears to be the second major asteraceous pollen producer like Ambrosia, its pollen was shed mainly in the autumn with the major
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 10 T—1-1-1-1-1-1-1-1-1-1-1-
Fig. 14.2 Parthenium aeropollen survey at Corpus Christi, Texas, U.S.A. in 1988 (From Lewis et al., 1990).
peak occurring between September 23 to October 6, though at a lower level of 8.8/m3. A secondary peak occurred during the spring (May 20 to June 2) at 2.9/m3.
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