COMPARATIVE ASSAY ON DAMAGING ABILITY OF PLODIA INTERPUNCTELLA(HÜBNER) IN LOW OXYGEN ENVIRONMENT

Knowing the damaging ability of insect pest,Plodiainterpunctella(Hübner),is benefit to the scientific management and guidance to control atmosphere.The changes of insect damaged kernel (IDK),thousand kernel weight (TKW) and fatty acid value (FAV) of wheat infested by first star larvae of P.interpunctella was assayed which was stored under condition of 8%,11%,14% and 21% of oxygen concentration.The wheat with 12.5% of moisture content was infested by P.interpunctell in four first star larvae per kilogarm of grain.Under condition more than 11% of oxygen concentration,it was obvious going up for IDK and down for TKW after seven say infestation.And FAV was going up rapidly after 21 day damaging by the insect.Under condition of 8% of oxygen concentration,IDK was changed a little in 14 day period and going up sharply after 21 day duration.The TKW was changed not too much until 42 day test.FAV was obviously varied after 35 day infested keeping.When orygen concentration being more than 11%P.interpunctella can damage wheat distinctly in seven day infestation.The insect damage ability to wheat was inhibited obviously in environment of 11% of oxygen concentration.Under condition of 8% oxygen concentration IDK was increased obviously after three weeks.FAV was increased obviously after one month.TKW was decreased a little more than one month.