Page 120 - BJS vol. 35

112 Bangladesh J. Sugarcane, 35 : 108-117 June, 2014

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the temperature and more than 47% (R =0.473) of variation in the stem borer population
can be explained by the variation of temperature. So, it indicates that the stem borer
population decreased with decreased temperature.
A positive linear relationship was observed between % sugarcane stem borer infestation
and percent relative humidity (Figure 1B). This suggests that stem borer population is
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dependent on the relative humidity and more than 36% (R =0.367) of variation in the
stem borer population can be explained by the variation of relative humidity. So, it
indicates that the stem borer population increased with the increase of relative humidity.

Figure 1. Relationship of sugarcane stem borer infestation with (A) average rainfall, (B)
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average relative humidity, (C) average temperature ( C) and (D) bright
sunshine (hours) at BSRI farm, Ishurdi, Pabna during the cropping season
2009-2010