Fluctuating temperatures influence the susceptibility of pest insects to biological control agents

Ghazanfar, Muhammad Usman; Hagenbucher, Steffen; Romeis, Jörg; Grabenweger, Giselher; Meissle, Michael

doi:10.1007/s10340-020-01215-9

Cited by 18 publications

(16 citation statements)

References 42 publications

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“…On contrast, C. medinalis larvae and pupae developed well at normal temperature 26 °C, with the lowest mortality and the highest pupation rate and eclosion rate. Thus, these results were consistent with previous reports that extreme low and high temperatures negatively influenced the larval growth and development [45][46], such as Spodoptera exigua (Hübner) [47], M. separata (Walker) [13] and other Lepidopteran insect species. As expected, low temperature resulted in slower growth rate and longer development time in insects [48], while high temperature accelerated the development of the egg, larval and pupal period [40].…”

Section: Discussionsupporting

confidence: 92%

Adaptive strategies of Rice Leaf Roller, Cnaphalocrocis medinalis in Response to Different Rearing Temperatures

Lv¹,

Jiang²,

Chen³

et al. 2021

Preprint

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Understanding how species that follow different life-history strategies respond to stressful temperature can be essential to efficient treatments against agricultural pests. Here we focus on how the development and reproduction of C. medinalis is influenced by exposure to different rearing temperatures in the immature stage. We found that low (18 or 22 °C) or high (30 and 34 °C) rearing temperatures negatively affected the immature development and flight performance compared to the normal temperature 26 °C, with higher larval and pupal mortality, lower pupation and eclosion rates and shorter flight duration and distance. Low rearing temperatures significantly slowed down the immature process, but accelerated adult reproduction. However, high rearing temperatures had the opposite impacts. Interestingly, the flight of adults with un-mature rearing low temperatures (18 and 22 °C) significantly decreased their lifetime fecundity and mating frequency, but increased pre-oviposition period of females compared to the control; On contrast, high rearing temperatures (30 and 34 °C) significantly accelerated onset of oviposition and enhanced synchrony of spawning. These results indicate high rearing temperatures in the immature stage are more likely to trigger the onset of migration, but low rearing temperatures induces adults to have a greater resident propensity with stronger reproductive ability.

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Section: Discussionsupporting

confidence: 92%

Adaptive strategies of Rice Leaf Roller, Cnaphalocrocis medinalis in Response to Different Rearing Temperatures

Lv¹,

Jiang²,

Chen³

et al. 2021

Preprint

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“…The results of this study showed that short-term high temperature treatment of Z.cucurbitae (Coquillett) adults resulted in decreased egg hatching rate, pupation rate and emergence rate of the next generation, increased sex ratio and decreased pupa weight, resulting in smaller offspring. The weight of pupae was also decreased when the larvae of Spodoptera mauritia and Heliothis virescens experienced continuous heat stress of 35°C (Ghazanfar et al 2020). Heat damage can induce changes in insect body size, and rapidly increasing temperature usually increases insect metabolism, resulting in increased generation of offspring and rapid population development (Atkinson 1994;Cara et al 2018;Tseng et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Effects of Multi-Scale Climate Change on The Distribution of Invasive Insect Populations and The Development of Ecological Services: A Case Study of Zeugodacus Cucurbitae (Coquillett)

Lian

Wang

Zeng

et al. 2021

Preprint

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In order to clarify the effects of multi-scale climate change on the population distribution and ecological service function of Z.cucurbitae, this paper analyzed its suitable distribution area Z.cucurbitae in a wide scale using the MaxEnt ecological model. Z.cucurbitae were exposed under short-term high temperatures of 33°C, 37°C, 41°C and 45°C for 1h, which were set based on recorded high temperatures in the field. The effects of these temperatures on development and reproduction of Z.cucurbitae in successive three generations were evaluated. The results showed that under current climatic conditions, the suitable regions of Z.cucurbitae included most of South America, southeast North America, sub-Saharan Africa, part of Oceania and southern coastal areas of Asia. Under two carbon emissions scenarios (RCP4.5 and RCP8.5), the suitable area of Z.cucurbitae will expand compared to that under current environment and this expansion will generally be northwards. Short-term high temperature was not conducive to the development and reproduction of Z.cucurbitae. The F1 Z.cucurbitae exposed under 45°C for 1h stimulated its oviposition, and the offspring can still continue the population. When the offspring were continuously exposed to short-term high temperature until the F3, they could not oviposit. In the context of climate change, both large-scale and small-scale changes will affect the distribution and population breeding of Z.cucurbitae, which will lead to local sudden outbreak or migration disaster. Therefore, a broad-scale distribution analysis of all populations as a whole will result in a narrow ecological niche and may fail to predict the effects of some local small-scale habitat changes.

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“…Beauveria bassiana, Metarhizium anisopliae, and Isaria fumosorosea are widely used in biological control programs and mycoinsecticides development owing to their easy handling, knowledge about their metabolism, and interaction with insects of different orders [3,4]. The challenges of entomopathogenic fungi application to pest control include reduced shelf life and low viability when exposed to high temperatures, ultraviolet radiation, and humidity [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Entomopathogenic Fungi Biomass Production and Extracellular Biosynthesis of Silver Nanoparticles for Bioinsecticide Action

Santos

Passos²,

Seabra

et al. 2021

Applied Sciences

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Entomopathogenic fungi are microbial agents of insect control in nature. They have been used as biologic strategies to manage insect invasion; however, the challenge is to maintain their shelf life and viability when exposed to high temperatures, ultraviolet radiation, and humidity. Synthesized silver nanoparticles (AgNPs) from fungal extracellular enzymes are an alternative using these microorganisms to obtain nanoparticles with insecticidal action. The present study evaluates the biomass production and the potential to synthesize silver nanoparticles using entomopathogenic fungi isolates. Sixteen isolates of entomopathogenic fungi were used in this study. The fungi pathogenicity and virulence were evaluated using the insect model Tenebrio molitor, at a concentration of 5 × 106 conidia/mL. The fungal biomass was produced in a liquid medium, dried, and weighed. The synthesis of silver nanoparticles was performed with aqueous extracts of the entomopathogenic fungi and silver nitrate solution (1 mM), following characterization by a UV/vis spectrophotometer, mean size, and polydispersity index. The results showed a significant variation in pathogenicity, virulence, and biomass production among the evaluated fungi isolates; however, only one of the isolates did not have the potential to synthesize silver nanoparticles. Pearson’s correlation showed significant correlation values only between virulence ´ biosynthesis potential and biomass production ´ biosynthesis potential, both with negative values, indicating an inverse correlation. Thus, AgNPs with entomopathogenic fungus extract can produce an innovative bioinsecticide product using a green production process.

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Fluctuating temperatures influence the susceptibility of pest insects to biological control agents

Cited by 18 publications

References 42 publications

Adaptive strategies of Rice Leaf Roller, Cnaphalocrocis medinalis in Response to Different Rearing Temperatures

Adaptive strategies of Rice Leaf Roller, Cnaphalocrocis medinalis in Response to Different Rearing Temperatures

Effects of Multi-Scale Climate Change on The Distribution of Invasive Insect Populations and The Development of Ecological Services: A Case Study of Zeugodacus Cucurbitae (Coquillett)

Entomopathogenic Fungi Biomass Production and Extracellular Biosynthesis of Silver Nanoparticles for Bioinsecticide Action

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