Confirmatory tests
In the two confirmatory tests, every 14 guavas infested with 7-
d-old larvae were placed in one plastic box (20 33 23 cm) for
radiation. On each of the treatment dates (July and September
2012), nine box was selected as control and the other eighty-four or
forty-three boxes were exposed to gamma radiation simultaneously
on a platform surrounding the source, where the boxes
were placed within 150 cm from the source. The irradiator was
stopped at half exposure time and the boxes were rotated 180 to
give a more uniform exposure. In each confirmatory test, five Fricke
dosimeters (2 in the center and 3 on the surface of guavas) were
included in every twentieth box to measure dose variation (Zhan
et al. 2014, 2015). The dose rate detected was 2.7 Gy/min.