The biological characteristics of Lasioderma serricorne and Ephestia elutella and the differences formed by generational overlap
Taking the individual development process of Lasioderma serricorne and Ephestia elutella as the starting point,a mathemati-cal model of generational overlap was established based on quantitative data of different stages and durations of Lasioderma serricorne and Ephestia elutella.The main biological characteristics and generational overlap of Lasioderma serricorne and Ephestia elutella were analyzed.The results showed that the width of the larval head capsule of Lasioderma serricorne changed significantly on days 8,12,15,18,and 23,while the width of the larval head capsule of Ephestia elutella changed significantly on days 5,10,14,and 23.At 8～25 days of cultivation,the instar of Lasioderma serricorne larvae was more concentrated;when cultured for 3～5 days,the instar of Ephestia elutella larvae was more concentrated,and when cultured for 10～33 days,Ephestia elutella larvae were distributed in all 3～4 instar stages.Under the same temperature and feed conditions,the emergence time of Lasioderma serricorne adults with different popu-lation densities was more concentrated,ranging from 5 to 7 days,while the emergence time of Ephestia elutella adults with different population densities was more dispersed.When the population density was between 360 and 400 indiriduals,the emergence time of Lasioderma serricorne and Ephestia elutella adults increased compared to other groups and the peak emergence time was delayed.The egg count and egg coverage period of the first four generations of Lasioderma serricorne had increased,but there was no overlap.Egg overlap occurred from the fifth generation onwards;Ephestia elutella eggs exhibited egg overlap starting from the second generation.In the comprehensive prevention and control of Lasioderma serricorne and Ephestia elutella,it was important to focus on blocking the in-teraction and infiltration between different populations of Ephestia elutella,in order to avoid increasing the difficulty of prevention and control due to mixed insect ages or staggered insect states.
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