The objective of this study was to investigate the effectiveness of certain
methyl bromide alternatives ‘ e. controlled atmospheres (CA) of various carbon
dioxide concentrations and CA of very high nitrogen content against some stored
product-insects inside gastىght bins.
The chosen treatments as methyl bromide alternatives were tested inside
gastight steel bins each of 0.5 m3 volume and was filled with ca. 450 kg wheat
grains. .
The bins were designed and constructed by the airplane Factory at
Heiwan and were situated on the roof of the building of the Plant Protection
Department of the Faculty of Agriculture at Moshtohor. Tukh- Quaiyubia- Egypt.
The results of the efficacy of controlled atmospheres containing around
3() and 60 % CO2 at grain temperatures of l’ 2°C and 26 + 2°C against the
adults and immature stages of Xitophilus orvzae Rhizopertha dominica and
Tri bolium castaneum as well as the active and diapausing larvae of Trogoderina
granarium showed that insect mortalities were concentration and exposure
period-dependent. Mortality values increased with the rise of concentration in the
CA and period of exposure. The efficacy of the tested CA of CO2 against the
various insects was also, greater at higher grain temperature than at lower one.
In general. the pupaé of the various insects were highly tolerant to the
CA of CO2 than the otherinsect stages. Meanwhile, the diapausing larvae of T
granarium were less susceptible to the CA of CO2 than active ones. The
susceptibility of the tested insects to the CA of CO2 varied according to insect
species and stage of development
The results of the efficacy of (‘A of 99 % N2 at grain tempcratures of IS
± 2°C and 26 ± 2°C against the adults and immature stages of .S’ orvzae. R
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