Voltinism and the Induction of Aestival Diapause in the Colorado Potato Beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)

Tauber, Maurice J.; Tauber, Catherine A.; Obrycki, John J.; Gollands, Brian; Wright, Robert J.

doi:10.1093/aesa/81.5.748

Cited by 58 publications

(28 citation statements)

References 10 publications

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“…According to Hodek (2012), 20-30% of beetles in northern regions enter diapause at any PP. The earlier investigations confirm the plant-mediated diapause cues in L. decemlineata and explain the relatively high occurrence of PP-insensitive individuals (Tauber et al 1988;Senanayake et al 2000). 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).…”

Section: Discussionsupporting

confidence: 72%

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: 72%

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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“…This coincides with the time when the Colorado potato beetle adults emerge from the soil and start to oviposit (Hiiesaar et al, 2013). Embryogenesis begins when temperatures rise to 10 … 12.5°C (Tauber et al, 1988). The harmful effect of low temperature depends on temperature rate and exposure time; the short-term effect of very low temperatures is considered equivalent to the long-term effect of mild temperatures (Sømme, 1996).…”

Section: Discussionmentioning

confidence: 95%

Cold tolerance of Colorado potato beetle (Leptinotarsa decemlineata Say) adults and eggs

Hiiesaar

Karise²,

Williams³

et al. 2014

Zemdirbyste-Agriculture

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The cold tolerance of different seasonal groups (pre-diapause, diapauses and post-diapause) of Colorado potato beetle (Leptinotarsa decemlineata Say) was assessed by exposing them either to a constant temperature of -3°C for 48 to 624 h, or to -3, −4, −5, −6 or −7 °C for a constant 24 h. Cold survival was affected by the length of exposure, by the temperature rates and by seasonality. The least cold-tolerant were pre-diapause beetles in August with a mean lethal temperature (Ltemp50) of −4.4°C for 24 h exposure and with a lethal time (Ltime50) of 106.8 h at −3°C. Cold tolerance was significantly higher in the diapause group in January and in the post-diapause group in March; it did not differ significantly between these groups of beetle for 24 h exposure, the lethal temperature being −5.8°C for both groups. Seasonality had a greater influence on survival of these groups after longer exposure to constant mild sub-zero temperature (−3°C); in diapause group, all the beetles survived 624 h exposure, but in post-diapause group the survival limit decreased to 216 h and lethal time was 153.9 h. Colorado potato beetle eggs tolerated 24 h exposure to sub-zero temperatures from −3°C to −5°C or longer exposure at −3°C for 72 h without a reduction in hatchability. The mean lethal time for 50% mortality of eggs was 76.5 h and mean lethal temperature was −5.8°C. Thus, we conclude that night frosts common in northern regions do not damage Colorado potato beetle adults or eggs to the extent that might threaten the survival of the population.

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“…Polymorphism in the timing of diapause has been reported in the Colorado potato beetle, Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae) in the USA (Tauber et al, 1988). In this beetle diapause was noticed to commence in part of the population early in the summer and extended over a long period.…”

Section: Discussionmentioning

confidence: 95%

“…Besides, laboratory studies clearly showed that adults younger than 15 days of age did not enter diapause. It was also observed that within a given generation, the percentage of adults entering diapause increased over time from 20% on the thirtieth day after emergence to 72% on the seventy-fifth day, thus indicating that there is no critical period in adult life for initiation of burrowing, as in the case of L. decemlineata (Tauber et al, 1988).…”

Section: Discussionmentioning

confidence: 98%

“…In this beetle diapause was noticed to commence in part of the population early in the summer and extended over a long period. Tauber et al (1988) noted this was a mechanism to cope with unfavourable environmental conditions. Leptinotarsa decemlineata is a 'long day insect', which enters diapause after exposure to a critically short photoperiod.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Diapause behaviour of Zygogramma bicolorata (Coleoptera: Chrysomelidae), a biological control agent for Parthenium hysterophorus (Asteraceae), in Bangalore, India

Jayanth

Bali

1993

Bull. Entomol. Res.

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Zygogramma bicolorata Pallister was introduced for biological control trials against the weed Parthenium hysterophorus (Asteraceae) in India. The insect entered diapause over an extended period of time between July and December in Bangalore. Diapausing adults burrowed into the soil, and emerged in MayJune with the commencement of monsoon rains. Percentage diapause increased over time, peaking at 72% during November. Non-diapausing adults were capable of breeding, under laboratory conditions, during the winter. Some adults bred both before and after diapause, during two consecutive years. Soil moisture played an important role in providing the conditions for burrowing or emerging from the diapause chambers. The studies also showed that diapausing adults had to be exposed to the high summer temperatures, for termination of the diapause. It was possible to break diapause by continuous exposure to 30°C, 35°C and 40°C for 22 days, nine days and 10 hours, respectively, during February-March, about three months after its inception. This method can be used to initiate mass multiplication for carrying out releases early in the season.

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Voltinism and the Induction of Aestival Diapause in the Colorado Potato Beetle, Leptinotarsa decemlineata (Coleoptera: Chrysomelidae)

Cited by 58 publications

References 10 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

Cold tolerance of Colorado potato beetle (Leptinotarsa decemlineata Say) adults and eggs

Diapause behaviour of Zygogramma bicolorata (Coleoptera: Chrysomelidae), a biological control agent for Parthenium hysterophorus (Asteraceae), in Bangalore, India

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