Comparative insecticidal activity of nano and coarse silica on the Chinese
beetle Callosobruchus Chinensis (L) (Coleoptera: Bruchidae)
الباحث الأول:
Mesbah, H. Ali
الباحثين الآخرين:
Haider. H. Ghitheeth
المجلة:
ALEXANDRIA
SCIENCE EXCHANGE JOURNAL
تاريخ النشر:
None
مختصر البحث:
ABSTRACT
The insecticidal activity of two types of silica (normal or coarse [CS] [150mm] and nano-silica particles [NSPs]
[35 nm]) was determined using Callosobruchus chinensis
(L) as the test insect. When the unsexed adults were
exposed to broa…
ABSTRACT
The insecticidal activity of two types of silica (normal or coarse [CS] [150mm] and nano-silica particles [NSPs]
[35 nm]) was determined using Callosobruchus chinensis
(L) as the test insect. When the unsexed adults were
exposed to broad bean seeds admixed with different concentrations of both tested silica (0.5, 1.0 and 2.0 g/100 g
seeds) for different periods (48, 96, 144 and 192 hrs), it was
found that NPS had more insecticidal activity against the bruchid beetle C. chinensis. Moreover, it was found that as
the exposure time and concentration increased, the mortality of the adults increased. For each concentration
of the tested silica with different exposure time, the LT50 of
the bioassay tests showed that the calculated LT50 values of
NSPs (83.44, 72.23 and 67.52 hrs) were less than those of
CS (140.00, 131.44 and 120.15 hrs at the three tested
concentrations of 0.5, 1.0 and 2.0 g/100g seeds, respectively). Therefore NSPs are more biologically active
than CS against C. Chinensis. The adults survived
treatment were left in the same bioassay jars to reproduce
the first generation (F1
) to determine the delayed effect of such tested concentration of both silica types. The results
showed that there were no emerged adult insects at the
concentrations of 1.0 and 2.0 g NSPs /100 g broad bean
seeds. The numbers of the emerged insects after treatment with coarse silica was decreased as the concentration
increased giving a range of emerged adults of 2.3-10.0 as compared with untreated check (control), which produced
24.7 adults. The pattern of picking-up silica particles of
both tested silica types was also illustrated showing more pick-up of particles in case of using NSPs concentrations. Nano-silica particles (NSPs) were found to be effective against the bruchid beetle C. chinensis and could be
effectively used in the Integrated Pest Management (IPM)
program for C. chinesis and for other stored grain insect- pests.
