Occurrence and development of the Japanese giant weevil, Sipalinus gigas (Fabricius) (Coleoptera: Rhynchophoridae), in cut pine bolts set in a forest stand at different times.

Nakamura, Kenichiro; Makino, Shio; Sato, Shigeho

doi:10.1303/aez.2000.435

Cited by 1 publication

(8 citation statements)

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“…The same measurements were done for the bolts set in 1996 and taken out 4 through 16 mo after oviposition, in which live larvae were found. There were no significant changes in the size of entrance hole (Fϭ0.39; dfϭ2, 31; pϾ0.6) nor head capsule width (Fϭ0.18; a Figures show the numbers of empty tunnels with entrance hole 3 mm or larger, which were supposed to be made by S. gigas (Nakamura et al, 2000). b Eight dead adults were included.…”

Section: Resultsmentioning

confidence: 99%

“…The study stand was the same as that described by Nakamura et al (2000). It was a 31-year-old plantation (in 1995) of the Japanese red pine, Pinus densiflora Sieb.…”

Section: Methodsmentioning

confidence: 99%

“…except for the holes inhabited by scolytids and holes less than 3 mm in dia. with live or dead S. gigas larva, according to Nakamura et al (2000). The survival rate of S. gigas in a bolt as of the time when examined was determined as follows: (number of live S. gigas found in the bolt)/(estimated number of colonized S. gigas in the bolt).…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, Furuta (1972) observed that most individuals considered to have been laid as eggs in the spring emerged by autumn of the same year. Nakamura et al (2000) investigated the developmental stages of S. gigas in cut pine bolts set in a forest stand at different times and showed that adult emergence occurred in the autumn of the year following oviposition as well as the current year. They also suggested that some individuals need three years or longer to become adults.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, we attempted to collect as many S. gigas colonizing cut pine bolts as possible by exposing a large number of bolts to a weevil field population at the peak time of oviposition, which was shown to be mid-June through July by Nakamura et al (2000). Bolts were examined periodically for live and dead S. gigas including immatures and adults to trace development and survivorship of the insects.…”

Section: Introductionmentioning

confidence: 99%

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Development and survivorship of the Japanese giant weevil, Sipalinus gigas(Fabricius)(Coleoptera: Rhynchophoridae), in cut pine bolts.

Nakamura

Lang

2002

Appl. Entomol. Zool.

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Cut pine bolts were exposed to allow a field population of Sipalinus gigas to oviposit and the colonized insects in the bolts were examined periodically up to 29 mo after oviposition. The estimated survival rate of the immatures in the bolts decreased throughout the first and second season, and reached almost zero before the second overwintering. Predation was thought to be one of the major mortality factors of immature S. gigas. The increase of larval size and formation of a pupal chamber indicated that larval growth of S. gigas was completed within 4-5 mo after oviposition. The occurrence of pupae, callow adults and emerged adults suggested that S. gigas have bimodal adult emergence, namely they emerge in autumn of the year when they were laid as eggs as well as in the autumn of the following year. Although a small number of live larvae were found just before the second overwintering, they were less likely to grow into adults in the third season because of the high mortality of immatures in the second and third seasons.

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Section: Resultsmentioning

confidence: 99%

“…The study stand was the same as that described by Nakamura et al (2000). It was a 31-year-old plantation (in 1995) of the Japanese red pine, Pinus densiflora Sieb.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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