信阳地区菱斑食植瓢虫幼虫龄期划分与生命周期研究

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中图分类号：S433.5 文献标志码：A 文章编号：1673-2871（2025）08-206-07

Study on the division of larval instarsand life cycle of Epilachna insignis in Xinyang area

HEN Junhua'²，WEN Xinru'， HOU Bingyi'，WANG Ran1，WANG Xiping'，LIU Hongmin1，2 （1.Xinyangctutrityn;noectioi gyResearchenter，Huangchuan465150，Henan，China）

Abstract：InordertoclarifythedivisionoflarvalinstarsofEpilachnainsignis，anditsbiologicalandecologicalcarac teristics，and toprovide theoretical basis for the scientific controlof E .insignis，theheadcapsulewidthandbodylengthof the larvae of E .insignis at each instar were measured indoors，and the life history，survival rate，fecundityandother parametersof theexperimentalpopulation were observedand analyzed bytheage-stage，two-sex life table.Theresults showed that the head capsule width and body length of the larvae of E .insignis could be used as the morphological index for the division of the instar of the larvae of E insignis.The developmental durationof the larvaeof E .insigniswasthe longestinthefourth instar，whichwas1.O2d; thedevelopmentaldurationofthefemaleadultswaslongerthanthatof the maleadults，and theaverage single female egg production was 248.89 eggs.The survivalrate ofeach stage before the adult stage of E insignis was relatively high，and the rate of the population mortality increased sharply when the eggs developto110 days;the intrinsic rateof increase （r） of the experimental population was O.O67，the finite rate of increase （λ） （20 was 1.069. The net reproductive rate （R0） was 133.471，and the mean generation time （ （T） was73.517 d. The body length andheadcapsulewidthofthelarvaeof E insignisintheXinyangareacanbeused for instardivision.Additionally， the larvae have a high survivalrate and along generation cycle，andthe population can grow steadily.These findings can provide scientific guidance for the timely control of this pest.

Keywords：Epilachna insignis;Trichosantheskirilowii;Larval instars;Life table

菱斑食植瓢虫（Epilachnainsignis），属瓢甲科（Coccinellidae）食植瓢虫亚科（Epilachninae）食植瓢虫属（Epilachna）[l。（剩余11132字）