Asian ladybugs (Harmonia axyridis): A new seasonal indoor allergen

The objective of this work was to compare biological aspects and life table parameters of the coccinellids Harmonia axyridis, Cycloneda sanguineaand Hippodamia convergens. Insects were fed eggs of Anagasta kuehniella, and reared at 24.5±1ºC, 70±10% relative humidity, with a 12 hour photophase. Hippodamia convergenstook about 1.6 day to complete development, longer than H. axyridis, and 2.4 day longer than C. sanguinea.At immature stages, H. axyridisexhibited the highest survival percentage (49.2%), in comparison to the other coccinellids. For mean adult longevity, H. convergenswas deficient, in comparison with the other species. Mean period of pre oviposition was the longest in C. sanguinea; the longest oviposition time occurred for H. axyridis; and the post oviposition period was similar between the coccinellids. Considering the reproductive parameters, H. axyridisshowed the best performance in all aspects. For life table, the values of H. convergenswere higher than, although close, to those of H. axyridis. Nevertheless, the high net reproductive rate of H. axyridis showed this species potential to increase population size. The biological characteristics of the exotic H. axyridis favors its invasion and establishment in Brazil, corroborating results noticed in other countries.

Download Full-text

Setosphlides A–D, New Isocoumarin Derivatives from the Entomogenous Fungus Setosphaeria rostrate LGWB-10

Natural Products and Bioprospecting ◽

10.1007/s13659-020-00292-8 ◽

2021 ◽

Author(s):

Wenbin Gao ◽

Xiaoxia Wang ◽

Fengli Chen ◽

Chunqing Li ◽

Fei Cao ◽

...

Keyword(s):

Harmonia Axyridis ◽

Chemical Shifts ◽

Human Tumor ◽

Tumor Cell Lines ◽

Human Tumor Cell ◽

Human Tumor Cell Lines ◽

Entomogenous Fungus ◽

Planar Structures ◽

Mcf 7 ◽

C Nmr

Abstract Investigation of the entomogenous fungus Setosphaeria rostrate LGWB-10 from Harmonia axyridis led to the isolation of four new isocoumarin derivatives, setosphlides A–D (1–4), and four known analogues (5–8). Their planar structures and the relative configurations were elucidated by comprehensive spectroscopic methods. The absolute configurations of isocoumarin nucleus for 1–4 were elucidated by their ECD spectra. The C-10 relative configurations for the pair of C-10 epimers (1 and 2) were established by comparing the magnitude of the computed 13C NMR chemical shifts (Δδcalcd.) with the experimental 13C NMR values (Δδexp.) for the epimers. All of the isolated compounds (1–8) were evaluated for their cytotoxicities against four human tumor cell lines MCF-7, MGC-803, HeLa, and Huh-7. Graphic Abstract

Download Full-text

Functional response of Harmonia axyridis preying on Acyrthosiphon pisum nymphs: the effect of temperature

Scientific Reports ◽

10.1038/s41598-021-92954-x ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Yasir Islam ◽

Farhan Mahmood Shah ◽

Xu Rubing ◽

Muhammad Razaq ◽

Miao Yabo ◽

...

Keyword(s):

Functional Response ◽

High Performance ◽

Acyrthosiphon Pisum ◽

Harmonia Axyridis ◽

Effect Of Temperature ◽

Functional Responses ◽

Aphid Control ◽

Host Aphid ◽

Predator Foraging

AbstractIn the current study, we investigated the functional response of Harmonia axyridis adults and larvae foraging on Acyrthosiphon pisum nymphs at temperatures between 15 and 35 °C. Logistic regression and Roger’s random predator models were employed to determine the type and parameters of the functional response. Harmonia axyridis larvae and adults exhibited Type II functional responses to A. pisum, and warming increased both the predation activity and host aphid control mortality. Female and 4th instar H. axyridis consumed the most aphids. For fourth instar larvae and female H. axyridis adults, the successful attack rates were 0.23 ± 0.014 h−1 and 0.25 ± 0.015 h−1; the handling times were 0.13 ± 0.005 h and 0.16 ± 0.004 h; and the estimated maximum predation rates were 181.28 ± 14.54 and 153.85 ± 4.06, respectively. These findings accentuate the high performance of 4th instar and female H. axyridis and the role of temperature in their efficiency. Further, we discussed such temperature-driven shifts in predation and prey mortality concerning prey-predator foraging interactions towards biological control.

Download Full-text