An experiment was conducted in mango orchard of Sher-E
Bangla Agricultural University (SAU) campus, Dhaka to determine the effect of
seasonal variation round the year and weather on population dynamics of mango mealybug
(Drosicha mangiferae) on mango tree. The mango mealybug
was first appeared in early December and disappeared in June in a year. Its
population started to increase gradually from December and continued up to
February when the ambient average temperature was 20.95°C, relative humidity 63% and rainfall was
absent. The highest population of the insect (33.33/30 cm branch) was recorded
in February and the lowest (3.75/30cm branch) in May. Adult insects appeared in February on the ground under the selected
mango tree showing the population of 6.67 males and 123.33 females per 81 m2.
Population of males (32.5/81m2) and that of females (352.75/81m2)
reached to the peak when the ambient temperature was 28.19°C, relative humidity 61% and the rainfall was
0.00 mm. When relative humidity was high and rainfall started adult females
enter into the soil and disappeared. Correlation between population of mealybug
and temperature was positive. Its population was negatively correlated with
relative humidity and rainfall.
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