Effect of Density on the Survival of Megalocaria dilatata in Different Stages

LIANG Hui; DENG Quan; LIU Guo; CHEN Hezhu; MA Peng; LI Bin; LIU Dongyang; YU Jiamin; JIANG Lianqiang; PU Deqiang

doi:10.11924/j.issn.1000-6850.casb2024-0530

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Chin Agric Sci Bull ›› 2025, Vol. 41 ›› Issue (8) : 105-110. DOI: 10.11924/j.issn.1000-6850.casb2024-0530

Effect of Density on the Survival of Megalocaria dilatata in Different Stages

LIANG Hui ¹ ,
DENG Quan ¹ ,
LIU Guo ¹ ,
CHEN Hezhu ² ,
MA Peng ¹ ,
LI Bin ³ ,
LIU Dongyang ¹ ,
YU Jiamin ³ ,
JIANG Lianqiang ¹ ,
PU Deqiang ²

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Abstract

In order to clarify the effects of rearing with different volume-density combinations on the developmental duration, survival rate, and weight of pupae and adults of the ten-spotted ladybird beetles, under conditions of 25℃, relative humidity of 60% to 80%, and a light cycle of 10 L:14 D, three containers (A: 1000 mL; B: 1500 mL; C: 2000 mL) and 3 densities (15 heads; 20 heads; 25 heads), feeding, recording and analyzing the development period, survival rate, pupal and adult weight of each insect of M. dilatata. The results showed that the survival curve of M. dilatata showed an "S" downward trend with the growth of instar, and the development duration of each treatment was C₃>C₁>A₁=C₂>A₃>A₂=B₂>B₁>B₃, and the average development time of group B was the shortest. The survival rate of the 1st and 2nd instar larval stage and pupal stage of each treatment was lower, and the pupation rate and adult rate of B₂ treatment were 76.67% and 73.33%, which were higher than those of the other treatments. The weight of each treatment at pupal stage from high to low was A₁>C₂>C₃>B₁>A₃>C₁>B₃>A₂>B₂, and the weight of adults from high to low was B₁>B₃>B₂>C₂>C₃>C₁>A₂>A₃>A₁. In summary, the best feeding container for M. dilatata should be B₂ treatment, that is, 1500 mL feeding density of 20 heads/box is the best. This study provides a theoretical basis for the efficient breeding of larvae of M. dilatata.

Key words

aphid / Megalocaria dilatata / larva / density / biological control / volume-density combinations / developmental duration / survival rate / weight

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LIANG Hui , DENG Quan , LIU Guo , et al . Effect of Density on the Survival of Megalocaria dilatata in Different Stages[J]. Chinese Agricultural Science Bulletin. 2025, 41(8): 105-110 https://doi.org/10.11924/j.issn.1000-6850.casb2024-0530

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https://doi.org/10.11924/j.issn.1000-6850.casb18080021

Cited in this article [1] Abstract

为探究不同容积-密度组合饲养七星瓢虫对其各历期存活率及成虫重量的影响,本研究在温度25℃、相对湿度60-80%,光照周期10L:14D条件下,设置3种容积 (1000ml、750ml、500ml)与3种密度 (25头、35头、45头)组合下观察统计不同历期七星瓢虫存活数,并对成虫称重。试验结果表明,密度-容积组合对低龄期幼虫存活的影响显著高于其它历期(P<0.05)。其中,1-2龄在500ml下的存活率25头、35头、45头均显著的低于750ml下的3种密度及1000ml-25头,依次为57.33%,48.57%,40.74%,其存活率的最佳容积与密度组合为750ml-35头,存活率达到88.57%；在3龄、4龄、蛹期及成虫时,其最佳饲养组合分别为500ml-25头、1000ml-25头、750ml-35头及750ml-35头,其存活率分别为93.33%、94.49%、92.38%和97.78%,但该最优组合在统计学上与其它组合无显著差异(P>0.05)；对初羽化成虫称重表明,除1000ml 25与45头/盒间有显著差异外(P<0.05),其余体积与密度组合下成虫体重均无显著差异 (P>0.05)。综上所述,在七星瓢虫规模化饲养中,幼虫阶段的低龄期存活率受密度及容器大小影响严重,当密度为25-45头时,应避免1-2龄阶段在小于500ml条件下饲养,对七星瓢虫规模化饲养条件的设置提供一定理论支持。