Pesticidi i fitomedicina 2011 Volume 26, Issue 3, Pages: 221-227
https://doi.org/10.2298/PIF1103221P
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Effects of 50°C temperature on Sitophilus granarius (L.), Sitophilus oryzae (L.) and Sitophilus zeamais (Motsch.)
Pražić-Golić Marijana (Institute of Pesticides and Environmental Protection, Belgrade)
Andrić Goran (Institute of Pesticides and Environmental Protection, Belgrade)
Kljajić Petar (Institute of Pesticides and Environmental Protection, Belgrade)
Adults of laboratory populations of granary weevil (S. granarius), rice
weevil (S. oryzae) and maize weevil (S. zeamais) were exposed at the
temperature of 50°C to determine lethal time (parameters LT20, LT50 and LT99)
and progeny production/reduction in F1 generation at mentioned temperature.
For each exposure and each species 25 adults aged 2-5 weeks, in four
replicates, were used. In the first treatment, the insects were exposed for
6, 10, 14, 16, 18, 20, 22, 26 and 30 min in plastic dishes (V=200 cm3) with
1.8 ± 0.2g of untreated coarse wheat. In the second treatment, in dishes with
100 g of untreated wheat grain the adults were exposed for 90, 100, 110, 120,
130, 140, 150, 165 and 180 min. After the exposure, the adults were placed in
100 g of untreated wheat grain, in four replicates, at 25 ± 1єC and 60 ± 5%
r.h., for recovery. After one, two and seven days of recovery, the weevils
were separated by sifting of wheat, and the mortality was determined, and
after total period of eight weeks from the exposure of parents, the effect on
progeny in F1 generation was determined. Lethal time for weevils was
determined by probit analysis, and progeny production/reduction by analysis
of variance. After weevils exposure in coarse wheat and after one, two and
seven days of recovery, S. oryzae adults were the most susceptible (LT50
12.48-13.68 min), and the most tolerant were adults of S. granarius (LT50
17.79-20.89 min). After insects exposure in wheat grain, the most susceptible
were S. granarius and S. oryzae (LT50 107.11-120.73 min), and the most
tolerant S. zeamais (LT50 139.90-155.35 min). After exposure of parents of
all three weevil species, in coarse wheat, progeny reduction at 100% level is
after 22 min. However, after exposure of parents of all three weevil species
in wheat grain, progeny reduction at 100% level in S. granarius is after 130
min, in S. oryzae after 150 min, and at 99.7% level in S. zeamais after 180
min. The investigations indicated that short-term exposure of weevils from
Sitophilus genus at the temperature of 50°C adversely affects their survival
and progeny production, as well as that there is a potential for its
successful use as a physical measure in control of storage pest insects.
Keywords: S. granarius, S. oryzae, S. zeamais, 50°C temperature, effects
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