Abstract:
This research was conducted at the laboratory of the department of Plant
Protection College of Agricultural Studies (Shambat) Sudan University of
Science and Technology.
The purpose of this study was to evaluate the efficacy of different
concentrations of NeemAzal-T/S, Malathion57 and a combination of both
insecticides against larvae and adults of the red flour beetle Tribolium
castaneum. All concentrations of NeemAzal-T/S gave a significantly
higher mortality percentage among the 3rd instar larvae than the adults.
In fact the recommended dose of NeemAzal-T/S did not cause any
mortality among the adults until the 7 th day (6.7%) and it reaches (13.3%)
by the 11th day. On the other hand the larvae experienced mortality since
the first day (3.3%) and reaches 43.3% on 7 th day, 63.3% on the 8th day
and 83.3 on the 11th day.
On the other hand the recommended dose of Malthion57 caused 43%
mortality among the larvae on the 1 st day as opposed to 87% mortality
among the adults. By the 2 nd day all treated adults were dead compared to
83% of the larvae, on the 3rd day the percentage mortality among the
larvae reach 97% and on the 4th day it reaches 100%.
The mortality percentage of the combination of Malathion57 and
NeemAzal-T/S showed that 60% of the adult died on the first day as
opposed to 57% of the larvae, the percentage mortality among the adults
on the 2nd, 3rd, 4th day was 80, 93 and 100% respectively. Where the
mortality percentage among the larvae for the same days was 70, 77 and
97% respectively. It is clear from the results that Malathion57 caused a
fast mortality compared to NeemAzal-T/S which start to kill the pest
after along period of exposure.
