Sampling pollen beetle (<scp><i>Brassicogethes aeneus</i></scp>) pressure in oilseed rape: which method is best?

Seimandi‐Corda, Gaëtan; Jenkins, Todd M.; Cook, S. M.

doi:10.1002/ps.6310

Cited by 10 publications

(19 citation statements)

References 47 publications

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“…In line with field observations performed by Seimandi‐Corda et al (2021), we observed a preferential feeding on young flower buds compared to intermediate and older ones. Ekbom and Borg (1996), Hervé et al (2015) and Seimandi‐Corda et al (2021) showed that pollen beetle females preferentially lay eggs on buds at an intermediate developmental stage. This suggests that the lower exploitation of intermediate buds for feeding might be a way to share resources that are used simultaneously for oviposition and feeding (López‐Ortega et al, 2019).…”

Section: Discussionsupporting

confidence: 93%

“…However, much less is known in other feeding guilds, including pollinivores. In line with field observations performed by Seimandi‐Corda et al (2021), we observed a preferential feeding on young flower buds compared to intermediate and older ones. Ekbom and Borg (1996), Hervé et al (2015) and Seimandi‐Corda et al (2021) showed that pollen beetle females preferentially lay eggs on buds at an intermediate developmental stage.…”

Section: Discussionsupporting

confidence: 93%

“…medium size buds; Hervé et al, 2015), while younger buds (i.e. small buds) are preferentially used for feeding (Ferguson et al, 2015; Nilsson, 1994; Seimandi‐Corda et al, 2021). However, the factors that influence this fine‐scale foraging strategy and particularly the clear preference for young flower buds over older ones are still unknown.…”

Section: Introductionmentioning

confidence: 99%

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Factors driving the within‐plant patterns of resource exploitation in a herbivore

et al. 2022

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1. Selective pressures exerted on the feeding behaviour of animals have been extensively studied to understand their foraging patterns. In herbivores, specific within-plant patterns of resource exploitation have been reported, but their determinants remain poorly understood.2. Here, we describe and decipher the determinants of the foraging pattern of the pollen beetle Brassicogethes aeneus, a pollinivorous insect that is a pest of oilseed rape Brassica napus. This insect feeds from flowers for almost all of its life cycle, except for a couple of weeks preceding blossoming. During this period, only flower buds are available and the insect destroys them to feed from the pollen they contain, causing serious yield losses.3. We found that during this critical period, pollen beetles exhibit a stereotypic intrainflorescence feeding pattern that depends on flower bud maturity. To explain this pattern, we first deciphered the selective pressures driving pollen beetles' feeding behaviour. Using a set of manipulative laboratory experiments, including behavioural experiments on plant tissues and artificial substrates, chemical characterization of plant tissues and performance experiments, we show that the pollen beetles' feeding behaviour does not seem to be driven by specialized metabolites or an attempt to reach an optimal nutrient balance, but rather by a process of maximization of total macronutrient intake. Next, using optimal diet choice models, we found that one aspect of the intra-inflorescence feeding pattern, the preference for young over old flower buds, could be well-explained through the lens of total macronutrient intake maximization per unit of time to access the resource. 4. Our study provides new insights into small-scale foraging patterns and highlights the need to characterize and assess the relative influence of several components of diet quality when deciphering selective pressures driving foraging patterns.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

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Factors driving the within‐plant patterns of resource exploitation in a herbivore

et al. 2022

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“…Pollen beetles (Coleoptera: Nitidulidae) are flower‐visiting insects, with certain species causing damage to economically important crops via adult feeding on the pollen of unopened flower buds. This can lead to bud abscission and blind stalks, thereby preventing the growth of pods and leading to considerable seed yield loss (Seimandi‐Corda et al., 2021). Females lay their eggs in flower buds, where the larvae feed on pollen.…”

Section: Introductionmentioning

confidence: 99%

Differences in colour preference among pollen beetle species (Coleoptera: Nitidulidae)

Vuts

Szarukán

Marczali

et al. 2022

J Applied Entomology

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Pollen beetles (Coleoptera: Nitidulidae) are major pests of oilseed rape and other crucifers. Efficient and timely management of these pests can greatly be improved by effective monitoring of their spatial and temporal distribution. In field trials in Hungary, we have discovered striking differences in colour responsiveness among pollen beetle species: Brassicogethes aeneus F. 1775 (earlier Meligethes aeneus) and B. viridescens F. 1775 responded most strongly to fluorescent yellow traps, whereas B. coracinus Sturm 1845, Fabogethes nigrescens Sturm 1845 and Meligethes atratus Olivier 1790 were most attracted to blue or white traps. Differences in the spring flight period were also recorded, with B. aeneus and B. viridescens flying ca. 1 month earlier than the other three species. Further tests established that funnel traps having both fluorescent yellow and blue colour cues are the most efficient in attracting a wide range of pollen beetle species. On the other hand, fluorescent yellow traps can be used to detect and monitor B. aeneus specifically.

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“…This could occur, as the migration of both insects depends on different temperatures (Johnen et al, 2010). The resulting consequence of higher pest abundances in warmer climates on crop damage and yield, however, depends on the timing of pest migration (Junk et al, 2015) relative to crop development (Weymann et al, 2015), for example, as pollen beetle immigration is most damaging during bud stage (Seimandi‐Corda et al, 2021; Williams, 2010). Thus, date of flowering may serve as proxy for vulnerability to pollen beetle damage and may modulate effects of high adult pollen beetle abundance on crop yield, yet evidence from field studies is lacking.…”

Section: Introductionmentioning

confidence: 99%

Earlier flowering of winter oilseed rape compensates for higher pest pressure in warmer climates

Fricke

Redlich

Zhang

et al. 2022

Journal of Applied Ecology

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Global warming can increase insect pest pressure by enhancing reproductive rates. Whether this translates into yield losses depends on phenological synchronisation of pests with their host plants and natural enemies. Simultaneously, landscape composition may mitigate climate effects by shaping the resource availability for pests and their antagonists. Here, we study the combined effects of temperature and landscape composition on pest abundances, larval parasitism, crop damage and yield, while also considering crop phenology, to identify strategies for sustainable management of oilseed rape (OSR) pests under warming climates. In all, 29 winter OSR crop fields were investigated in different climates (defined by multi‐annual mean temperature, MAT) and landscape contexts in Bavaria, Germany. We measured abundances of adult pollen beetles and stem weevil larvae, pollen beetle larval parasitism, bud loss, stem damage and seed yield, and calculated the flowering date from growth stage observations. Landscape parameters (proportion of non‐crop and OSR area, change in OSR area relative to the previous year) were calculated at six spatial scales (0.6–5 km). Pollen beetle abundance increased with MAT but to different degrees depending on the landscape context, that is, increased less strongly when OSR proportions were high (1‐km scale), interannually constant (5‐km scale) or both. In contrast, stem weevil abundance and stem damage did not respond to landscape composition nor MAT. Pollen beetle larval parasitism was overall low, but occasionally exceeded 30% under both low and high MAT and with reduced OSR area (0.6‐km scale). Despite high pollen beetle abundance in warm climates, yields were high when OSR flowered early. Thereby, higher temperatures favoured early flowering. Only among late‐flowering OSR crop fields yield was higher in cooler than warmer climates. Bud loss responded analogously. Landscape composition did not substantially affect bud loss and yield. Synthesis and applications: Earlier flowering of winter OSR compensates for higher pollen beetle abundance in warmer climates, while interannual continuity of OSR area prevents high pollen beetle abundance in the first place. Thus, regional coordination of crop rotation and crop management promoting early flowering may contribute to sustainable pest management in OSR under current and future climatic conditions.

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Sampling pollen beetle (Brassicogethes aeneus) pressure in oilseed rape: which method is best?

Cited by 10 publications

References 47 publications

Factors driving the within‐plant patterns of resource exploitation in a herbivore

Factors driving the within‐plant patterns of resource exploitation in a herbivore

Differences in colour preference among pollen beetle species (Coleoptera: Nitidulidae)

Earlier flowering of winter oilseed rape compensates for higher pest pressure in warmer climates

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