2. Material and Methods
2.1 Study site
The principal collection site in the present study was the
Calicut University Campus located in the Mlappuram
district of Kerala. The Campus is located latitudes of
11.25 latitudes and 75.78 longitudes and an altitude of 47
m elevation. The climate is typical for the humid tropics.
The area shows an annual temperature range of 20-36
o
C
and RH of 60-80%. The region usually receives 3068.18
mm rain fall per year. Summer season extends from
February to May. The south West monsoon period is from
June to September and North East monsoon period is from
October to November. The winter period usually extends
from December to January. During summer, the highest
day temperature is in between 31° C to 38° C.
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