บทคัดย่องานวิจัย

หมวดหมู่ : ฐานข้อมูลงานวิจัย

Effect of Sitophilus zeamais and Aspergillus chevalieri on the oxygen level in maize stored hermetically.

Moreno-Martinez, E.; Jimenez, S.; Vazquez, M. E.;

Journal of Stored Products Research Year: 2000 Vol: 36 Issue: 1 Pages: 25-36 Ref: 33 ref.

2000

บทคัดย่อ

Effect of Sitophilus zeamais and Aspergillus chevalieri on the oxygen level in maize stored hermetically.

Maize grain of hybrid AN 447 was: (a) infested with Sitophilus zeamais and infected with Aspergillus chevalieri; (b) infested with S. zeamais; (c) infected with A. chevalieri; and (d) grain free of insects and fungus (control); the treatments were stored for 30 days at 26 deg C and 15% moisture content, under hermetic and non-hermetic conditions to monitor the oxygen concentration, insect mortality, insect offspring, grain germination, and fungal growth. The oxygen was depleted to 0% after 6-9 days in those treatments infested with insects, whereas the same oxygen level was reached after 24 days in grain with the storage fungus alone. The oxygen level gradually decreased to 8.4% after 30 days in the control treatment. All insects were dead after 6 days in grain with insects and fungus, and after 12 days in grain with insects alone. A low mortality rate (1.5-3.5%) occurred in equivalent treatments of the non-hermetic conditions. Because oxygen was depleted to 0% after 6 to 9 days in those treatme

nts infested with insects, the weevils of both infested treatments under hermetic conditions produced a significantly lower number of offspring compared with those in the non-hermetic conditions. Under hermetic conditions in grain treated or not treated with fungicide, the storage fungus A. chevalieri invaded a low percentage of grains. A low percentage of fungal invasion occurred in grain stored under non-hermetic conditions also, where the decreased moisture content did not favour fungal growth. The grain germination of those treatments stored under hermetic conditions was significantly lower than those treatments stored under non-hermetic conditions. The insects were the main oxygen consumers, followed by the fungus and finally by the grain. Under sealed storage conditions, insects and fungus combined forces to deplete the oxygen of hermetically stored maize, creating an unfavorable atmosphere for their own survival.