Temperature and Induction of Diapause in Epicauta gorhami MARSEUL (Coleoptera: Meloidae)

Nagatomi, Akira

doi:10.1303/jjaez.11.62

Cited by 4 publications

(3 citation statements)

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“…In meloids, post‐diapause larvae (second grub; i.e. sixth instar in the case of E. gorhami ) do not feed (Nagatomi & Iwata, 1958; Mochida, 2003; Pinto, 2009) but are found to lick soil before pupation (Y. Shintani & M. Terao, unpublished data). Thus, in meloids, the availability of water may have a vital effect on post‐feeding larval development both before and after diapause.…”

Section: Discussionmentioning

confidence: 99%

“…Indeed, it is observed that the first grub of Epicauta lemniscata pupates in summer without entering pseudopupal diapause, which indicates that the last two instars can be omitted under some conditions (Ingram & Douglas, 1932). However, only a few studies (Nagatomi, 1967; Zhu et al , 2006) have examined the effects of environmental factors on the induction of pseudopupal diapause in meloids.…”

Section: Introductionmentioning

confidence: 99%

“…This meloid undergoes six instars in the larval stage and the pseudopupa occurs in the fifth instar. Nagatomi (1967) suggests that, at high temperature (30 • C), E. gorhami larvae pupate directly from the fourth instar (first grub) without undergoing the pseudopupa and second grub phases. This finding suggests that the induction of pseudopupal diapause is dependent on environmental factors and that more than one generation may be produced in a year, although E. gorhami is considered to have a univoltine life cycle (Mochida, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Effects of temperature, photoperiod and soil humidity on induction of pseudopupal diapause in the bean blister beetle Epicauta gorhami

Shintani¹,

Hirose²,

Terao³

2010

Physiological Entomology

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Larvae of the bean blister beetle Epicauta gorhami Marseul (Coleoptera: Meloidae) feed on grasshopper eggs in soil and undergo hypermetamorphosis. This beetle undergoes larval diapause in the fifth instar as a pseudopupa, a form characteristic of hypermetamorphosis in meloid beetles. The effects of temperature, photoperiod and soil humidity on larval development of E. gorhami are examined in a population in Miyazaki, Japan, using egg pods of Locusta migratoria L. as food. At lower temperatures (20 and 22.5 • C), all larvae become pseudopupae, regardless of the photoperiod. By contrast, at higher temperatures (27.5 and 30 • C), almost all larvae pupate at the end of the fourth instar, again regardless of the photoperiod. A long-day photoperiodic response occurs only at an intermediate temperature (25 • C): under an LD 12 : 12 h photocycle, all larvae enter diapause, although the diapause incidence tends to decrease as the day length becomes longer. Pseudopupae are immobile and remain in diapause for ≥120 days when they are kept under the same conditions, except that diapause terminates within a relatively short time at 30 • C. Although lower soil humidity retards post-feeding development, soil humidity has no effect on the diapause incidence. On the basis of the short developmental period and diapause avoidance under summer conditions, it is suggested that this beetle partially produces two generations a year in southwestern Japan.

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Section: Discussionmentioning

confidence: 99%