Effects of Potato Foliage Age and Temperature Regime on Prediapause Colorado Potato Beetle &lt;I&gt;Leptinotarsa decemlineata&lt;/I&gt; (Coleoptera: Chrysomelidae)

Noronha, Christine; Cloutier, Conrad

doi:10.1603/0046-225x-35.3.590

Cited by 33 publications

(8 citation statements)

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“…Our early experiments showed that up to 80% of beetles enter diapause and burrow into the soil at the end of July at long day conditions after temporary starvation or if they have to eat old wilted leaves; at the same time less than 20% of beetles diapaused if they were supplied with fresh food (Hiiesaar et al 2015). The same results were obtained by other authors who showed that beetles feeding upon senescing or older leaves displayed a higher incidence of diapause when compared with those feeding upon younger or 'healthier' plant material (Hsiao 1978(Hsiao , 1981Noronha & Cloutier 2006). These latter beetles have a good chance of surviving winter.…”

Section: Discussionsupporting

confidence: 86%

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Phenology and overwintering of the Colorado potato beetleLeptinotarsa decemlineataSay in 2008–2015 in Estonia

Hiiesaar

Jõgar

Williams

et al. 2016

Acta Agriculturae Scandinavica, Section B — Soil & Plant Sc

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Before its establishment in Estonia at the beginning of the twenty-first century, the Colorado potato beetle Leptinotarsa decemlineata Say was a notifiable quarantine pest for many years. In high-latitude environments it encounters strong evolutionary pressure to adapt to low temperatures due to high overwintering mortality and periodic influx of new individuals from more southern populations. Our study focused on gathering evidence for such a range shift leading to the formation of a permanent local population. The phenology and overwintering success of beetles was investigated from 2008 to 2015. Depending on weather conditions in the different years, the overwintered beetles emerged from the soil from the beginning of May to mid-June. Over 700 degree days accumulated in 2010, 2011, 2013 and 2014 exceeding the limit needed for development of two generations. However, food supply and temperature distribution in the growing period enabled development of the second complete generation only in 2010 and 2013. Survival of overwintering beetles in field conditions varied between 18% and 47% in the different years. Winter mortality was not associated with low air temperature in any year as snow cover provided the necessary protection and winter soil temperatures at the depth of 30 cm remained at around 0°C for the duration of the whole observation period, with only some records as low as −3.5°C. The survival of overwintering beetles is more likely defined by factors other than low temperature. As a result of periodic invasions of beetles with naturally lower cold resistance originating from southern regions, the structure of the overwintering population in Nordic temperate conditions is not homogeneous. Moreover, this may also be derived from cultural practices, as commercial producers regularly apply agrochemicals while organic growers avoid them. ARTICLE HISTORY

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Section: Discussionsupporting

confidence: 86%

“…However the overwintering success of these beetles may be at risk, as many of them may not have completed their development in favourable conditions. Low temperatures in late autumn may force the beetles to feed on low-quality food preventing them from accumulating sufficient metabolic reserves for the winter (Noronha & Cloutier 2006).…”

Section: Introductionmentioning

confidence: 99%

Phenology and overwintering of the Colorado potato beetleLeptinotarsa decemlineataSay in 2008–2015 in Estonia

Hiiesaar

Jõgar

Williams

et al. 2016

Acta Agriculturae Scandinavica, Section B — Soil & Plant Sc

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“…Successful diapause is a dynamic manifold physiological process (Kostál 2006) that often requires the completion of certain physiological changes (Noronha & Cloutier 2006; Hahn & Denlinger 2007) and correct behavioural responses to environmental cues. For example, insects that diapause as adults must accumulate sufficient fat reserves before entering diapause since these reserves are the main source of energy during long winter periods (Hahn & Denlinger 2007).…”

Section: Introductionmentioning

confidence: 99%

Energy use, diapause behaviour and northern range expansion potential in the invasive Colorado potato beetle

Piiroinen¹,

Ketola

Lyytinen

et al. 2011

Functional Ecology

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Summary 1.As organisms expand their range towards northern latitudes they will encounter selective factors like harsh winter conditions. The ability to cope with and adapt to harsh winters may depend on the variability and evolutionary potential of relevant traits. 2. One adaptation in insects is winter diapause. It is characterized by changes in physiology, behaviour or in both. Physiological changes include lowered metabolic rate that enhances survival by saving limited energy reserves during overwintering. Active behavioural changes like burrowing into the soil allow individuals to escape harsh conditions. 3. We examined variation in overwintering body mass, resting metabolic rate (CO 2 production) and diapause behaviour (burrowing into the soil), and their effects on overwintering success in the adult Colorado potato beetles (Leptinotarsa decemlineata). We conducted a full-sib ⁄ half-sib rearing experiment to estimate the evolutionary potential (heritability) of these traits. 4. High overwintering body mass and low metabolic rate were phenotypically associated with high diapause propensity (i.e. burrowing), which was linked to high overwintering survival. We found that once beetles had entered the soil, only large body mass of males was associated with high overwintering survival. However, the heritability estimates in all traits examined were low. 5. Our results show that winter conditions impose selection on diapause behaviour, which was linked to lower metabolic rate and larger body mass. If range expansion to higher latitudes requires adaptive genetic changes in diapause behaviour, metabolism, or body mass, the insufficient genetic variation in these traits suggest that the Colorado potato beetle's future potential to respond to selection due to harsher winters could be limited and thus, its range expansion could be hindered. Both physiological and behavioural adaptations are important to consider when assessing range expansion potential.

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“…Previous studies investigating the interaction of diapause and leaf quality within L. decemlineata identified a significant effect of age and plant health on diapause incidence (Hsiao, 1978(Hsiao, , 1981Noronha & Cloutier, 2006). Beetles feeding upon senescing or older leaves displayed a higher incidence of diapause when compared with beetles feeding upon younger or 'healthier' plant material.…”

Section: Introductionmentioning

confidence: 96%

“…Diapause induction is often sensitive to changes in plant quality. Older and senescing plant material can induce diapause in some insect species (Noronha & Cloutier, 2006;Wang et al, 2006;Takagi & Miyashita, 2008). Within temperate regions, however, host plant quality may be a suboptimal cue for seasonal synchronisation because non-seasonal factors (e.g.…”

Section: Introductionmentioning

confidence: 99%

Time of the season: the effect of host photoperiodism on diapause induction in an insect herbivore, Leptinotarsa decemlineata

Izzo

Armstrong

Hawthorne

et al. 2013

Ecological Entomology

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1. Diapause, seasonal physiological dormancy, is the primary life history strategy used by insect species inhabiting temperate climates for seasonal synchronisation. Biotic signals for diapause induction originating from host plants may provide dependable cues for insects expanding from subtropical regions.2. We investigated the effect of plant-mediated photoperiod cues on diapause initiation within the Colorado potato beetle, Leptinotarsa decemlineata Say. The effect of photoperiod changes on potato leaf composition and its subsequent correlation with diapause initiation was tested.3. Analyses revealed a significant effect of short-day (LD 8 : 16 h and LD 10 : 14 h) photoperiod growth regimens on both nitrogen content in potato leaves and diapause initiation within L. decemlineata.4. Potato plants grown under short day conditions displayed significantly higher levels of leaf nitrogen compared with long-day treated plants. Over 65% of beetles feeding upon short-day treated plants initiated diapause compared with < 20% of beetles placed upon long-day treated plants.5. The observation of seasonality-induced diapause signals by host plants signifies an important addition to the current array of plant-insect interactions. The present results suggest that seasonal synchrony may be the result of a more integrated system whereby host plant photoperiodism acts as an intermediate or supplementary physiological cue for diapause initiation.

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Effects of Potato Foliage Age and Temperature Regime on Prediapause Colorado Potato Beetle <I>Leptinotarsa decemlineata</I> (Coleoptera: Chrysomelidae)

Cited by 33 publications

References 34 publications

Phenology and overwintering of the Colorado potato beetleLeptinotarsa decemlineataSay in 2008–2015 in Estonia

Phenology and overwintering of the Colorado potato beetleLeptinotarsa decemlineataSay in 2008–2015 in Estonia

Energy use, diapause behaviour and northern range expansion potential in the invasive Colorado potato beetle

Time of the season: the effect of host photoperiodism on diapause induction in an insect herbivore, Leptinotarsa decemlineata

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