Pollen Calendar Of Bangalore City India

The magnitude as well as the quality of pollen load in the atmosphere vary from year to year. There can be significant variations in atmospheric pollen even between successive years. This aspect was highlighted by Agashe and Abraham (1990) while compiling the pollen calendar of Bangalore city for the two consecutive years, 1982-1983 and 1983-1984. It is seen that in these two pollen calendars, 15 major pollen types constituted over 96% of the total pollen load in the atmosphere of Bangalore. There were not many qualitative variations between the two calendars as the 15 major pollen types remained the same for both the years. However, quantitative variations between the two pollen calendars were noteworthy (Figs. 13.9 a, b). There was a 19% increase in the number of pollen grains in the air during 1983-1984 (745/cm2) as compared to 1982-1983 (6522/cm2) Parthenium pollen which is known to be second highest pollen in the atmosphere of Bangalore showed a 26% increase during 1983-1984 where as Syzygium pollen count recorded an 81% decrease in 1983-1984. Pollen of Mimosa pudica (sensitive plant) was 15th among the dominant airborne pollen during 1982-1983, whereas during 1983-1984, it was 8th in the order of predominance of airborne pollen (Figs. 13.10 a, b, c).

The high pollen months were June (1,141/ cm 2) and July (1,782 /cm2) for the year 1982-1983 and 1983-1984 respectively. The maximum Parthenium incidence was in August during 1982-1983 whereas it was in July during 1983-1984. Similarly, peak pollen incidence of Casuarina shifted from February in 1982-1983 to March in 1983-1984.

It was also observed that pre-monsoon showers (May-June) of the year 1983 (324.9 mm) were slightly more and also more spread out than in the year 1982 (244.3 mm). This aided Parthenium weed to proliferate and flower profusely.

Pre-monsoon showers help for the prolific vegetative growth of Parthenium plants, which leads to profuse flowering in the monsoon and post monsoon season. Early rains (May-June) during the year invariably cause the airborne pollen of herbaceous taxa to peak earlier and late rains postpone the peak. It is very important that an aerobiological survey of an

Flowering (Pollination Calendar)

Flowering (Pollination Calendar)

Pollen Count Weather Factors

(Pollen Calendar) (Meteorology)

Pollen Count Weather Factors

(Pollen Calendar) (Meteorology)

Other pollen (16.7%)

Casuarina (13.3%)

Other pollen (16.7%)

Parthenium (53.4%)

Fig. 13.10a Atmospheric pollen in Bangalore, India during 1982-1983. Other pollen (14.5%)

Casuarina (10.9%)

Fig. 13.10a Atmospheric pollen in Bangalore, India during 1982-1983. Other pollen (14.5%)

Casuarina (10.9%)

Parthenium (67.8%)

Fig. 13.10b Atmospheric pollen in Bangalore, India during 1983-1984.

Parthenium hysterophorus (43%)

Amaranth chenopod (20%)

Amaranth chenopod (20%)

Ricinus communius (2%) Cocos nucifera (3%)

Unidentified pollens (5%)

Ricinus communius (2%) Cocos nucifera (3%)

Unidentified pollens (5%)

Casuarina equisetifolia (8%)

Poaceae members (9%)

Fig. 13.10c Allergically significant pollen representation in the atmosphere of Bangalore City, India (Figs. 13.9a,13.9b,13.10a, 13.10b and 13.10c from Agashe and Jacob, Abraham, 1990).

area should be a continuous process over several years (Agashe 1996). It is also imperative for an allergist to update his/her knowledge of the pollen calendar every year and keep track of the variations in the air spora which have tremendous implications in allergic manifestations.

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Responses

  • anneli
    Does bangalore have alot of pollen?
    2 years ago
  • stephen
    When does parthenium blooms in Bangalore?
    2 months ago

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