A Comparison of Fitness-Related Traits in the Coleopteran Parasitoid Dastarcus helophoroides (Coleoptera: Bothrideridae) Reared on Two Factitious Hosts

2020 ◽  
Vol 113 (6) ◽  
pp. 2634-2640
Author(s):  
Haoni Shi ◽  
Jiaying Zhou ◽  
Yuansheng Chen ◽  
Qinzhao Wang ◽  
Youliang Pan ◽  
...  
Keyword(s):  
Egg Production ◽  
East Asian ◽  
Mass Rearing ◽  
Asian Countries ◽  
Developmental Duration ◽  
Preoviposition Period ◽  
Adult Body ◽  
Factitious Host ◽  
Dastarcus Helophoroides ◽  
Coleoptera Tenebrionidae

Abstract The coleopteran parasitoid Dastarcus helophoroides (Fairmaire) (Coleoptera: Bothrideridae) is considered an efficient preventative method against the damage caused by a large number of cerambycid pests in China and other East Asian countries. Mass rearing of this parasitoid depends on screening appropriate factitious hosts. In this paper, the fitness-related traits of this parasitic beetle were explored using pupae of the two tenebrionid beetles, Tenebrio molitor Linnaeus and Zophobas morio Fabricius (Coleoptera: Tenebrionidae) as factitious hosts. The results showed that in dual-choice trials, D. helophoroides larvae preferred to attack Z. morio pupae. In no-choice trials, D. helophoroides reared on Z. morio pupae displayed significantly higher pupation and emergence rate, longer developmental duration of larval and larval–pupal stages, larger adult body size, shorter preoviposition period, more egg masses and egg production, and higher relative expected reproduction than those reared on T. molitor pupae. These results demonstrate that Z. morio is a more suitable factitious host for mass rearing of D. helophoroides.

scholarly journals Density-Dependent Growth and Fitness in Dastarcus helophoroides (Coleoptera: Bothrideridae)

Insects ◽  
2019 ◽  
Vol 10 (11) ◽  
pp. 386 ◽  
Author(s):  
Shang-kun Gao ◽  
Cui-cui Geng ◽  
Ying-chao Ji ◽  
Zi-kun Li ◽  
Cheng-gang Zhou
Keyword(s):  
Body Size ◽  
Larval Density ◽  
Mass Rearing ◽  
Immature Stage ◽  
Developmental Duration ◽  
Emergence Success ◽  
Longhorn Beetles ◽  
Adult Fitness ◽  
Dastarcus Helophoroides ◽  
Rearing Techniques

The ectoparasitoid Dastarcus helophoroides Fairmaire (Coleoptera: Bothrideridae) is an important natural enemy insect, which is artificially mass-reared and released into woodland to control medium and large longhorn beetle species. This study examined the developmental duration (days) of larvae and adult fitness (including numbers of adults emerging per host and mean body size) by exposing a single substitute host, a pupa of Zophobas morio (Coleoptera: Tenebrionidae), to different densities of D. helophoroides larvae. We showed that there was no significant effect on the rate of successful parasitism and cocoon formation, but emergence success and measures of individual adult body size (length, width, and weight) declined with increasing larval density. Larval period and cocoon period increased with larval density, while total weight of adults emerging per host increased initially before reaching a plateau. Our results suggest that a pupa of Z. morio could be successfully parasitized by a single D. helophoroides larva, but multiple D. helophoroides larvae can share one host. Excessive larval density caused intraspecific competition among D. helophoroides larvae, manifesting in extended developmental duration of immature stage and reduced fitness of adults. Furthermore, the tradeoff between the numbers of adults and body size may stabilize the population dynamics with detectable mutual interference, particularly in competing for limited host resources. These findings suggest six larvae per host would achieve the highest adult fitness and would enhance mass-rearing techniques as part of IPM strategies for longhorn beetles.

Creativity in East Asian Countries

Asia Review ◽  
2015 ◽  
Vol 4 (2) ◽  
pp. 31
Author(s):  
Cheong-Tag Kim
Keyword(s):  
East Asian ◽  
Asian Countries

SPECIFIC FUNCTIONING OF INTERNATIONAL BUSINESS IN KEY COUNTRIES OF EASTERN ASIA

2020 ◽  
Vol 3 (7) ◽  
pp. 135-139
Author(s):  
K. D. GVASALIYA ◽  
Keyword(s):  
International Business ◽  
East Asian ◽  
Asian Countries ◽  
Eastern Asia ◽  
Economic Relations ◽  
Economic Role ◽  
East Asian Region ◽  
Doing Business ◽  
World Economic ◽  
Characteristic Features

The East Asian region plays an important economic role in the system of world economic relations, includ-ing one fifth of the world's population with a rapidly growing middle class and mobility that creates high consumer demand. The specifics of the functioning of international business in the key East Asian countries, including gov-ernment regulation, forms of doing business, characteristic features and stages of the formation of international business, differ significantly from those adopted in Western countries. Due to this, the study of the development and functioning of international business in the region is a relevant area of research. The article discusses the main specific features of the Asian business model, analyzes the specificity and forms of functioning of international business in the East Asian countries.

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