Study on Growth and Development of Cheyletus Malaccensis Under Different Nitrogen Gas Volume Fractions
Stored grain pest control by Cheyletus malaccensis(Oudemans)is an ecological long-term predator control technology,while nitrogen atmosphere control is an efficient physical control technology.In order to combine the advantages of the two pest control techniques,in this study,the feasibility of the combination of Cheyletus malac-censis and nitrogen atmosphere in the control of stored grain pests was explored.At 27 ℃ and 75％RH,a 30-day tolerance test was carried out by using Lasioderma serricorne eggs as prey of C.malaccensis under the conditions of 90％,95％and 98％nitrogen,respectively.The survival,predation,and reproduction of C.malaccensis under dif-ferent nitrogen concentration were observed.The results indicated that the mortality rate of C.malaccensis was 100.00％after 3 days in 98％nitrogen concentration.At 95％nitrogen gas concentration,the mortality rate of C.malaccensis was 46.66％at 30 days.The average number of eggs laid per mite was 6,and the average hatching rate was 4.7％.An average of 37 eggs were preyed on by a mite.These indicated that C.malaccensis was capable of es-tablishing a small-scale population and predation.Under 90％nitrogen concentration,C.malaccensis showed a mere 13.00％mortality rate after 30 days,demonstrating their ability to thrive.Each mite produced an average of 13 eggs and the average hatching rate of these eggs was 77％.Each mite exhibited an impressive average consumption of 32 prey items.These results indicated that C.malaccensis can establish a population under the nurturing conditions of a 90％nitrogen gas environment and have predation ability.In summary,while the survival of these mites was chal-lenged in an insecticidal concentration of 98％nitrogen gas,they exhibited their full potential when exposed to con-centrations ranging from 90％to 95％.They can complete their life cycle with finesse,showing their remarkable predatory abilities.Therefore,the prospects of integrating C.malaccensis with nitrogen gas-controlled atmosphere technology hold tremendous promise.
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