. Effect of the magnetic field on the physiological aspects of some
insects was studied for larvae of three insects reared in laboratory under 25
±2°C and 70 ±5% RH in suitable rearing boxes. An experimental set-up was
designed to measure the magnetic flux density in the rearing box. The magnetic
field was calibrated to obtain the point of the maximum gradient. Magnetic flux
density was measured using a Tesla meter and recorded average values of 21.8,
249 and 863 Gauss (G) for the 3 insects respectively. The three insects were:
cotton leaf warm, S. littoralis, red palm weevil, R. ferrugineus and the
greater wax moth, Galleria mellonella. Rearing insects started with a suitable
larval instar. Numbers of larvae (form each insect) divided into 2 similar and
equal groups, the first reared as a control (without magnetic field), while the
second group was exposed to the magnetic field, (MF) along rearing periods. An
appropriate numbers of larvae from the control and the treated ones were taken
for Bio-chemical analysis and the main parameters were recorded. The measured
physiological parameters were: total protein, total carbohydrates, total
lipids, invertase enzyme and alkaline phosphatase. Results showed that each of
body weight and growth rate as well as the physiological aspects was affected
with the magnetic field. Rate of growth was negatively affected as it decreased
in cotton leaf worm and red palm weevil. Results also demonstrated that invertase
enzyme decreased in the treated larvae of S. littoralis ans G. mellonella with
40.15% and 28.33% respectively lower than the control. In the same time,
magnetic field led to increase the invertase enzyme in R. ferrugineus with
71.6% higher than the control samples. In spite of the strong magnetic flux
around the larvae of G. mellonella their influence was limited. This may be due
to the special behaviour of the worms as they of internal presence and entrance
inside the rearing media for these larvae. - See more at: .
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