Resistance Against White Pine Weevil: Effects on Weevil Reproduction and Host Finding

Sahota, T. S.; Manville, J. F.; Peet, F. G.; White, Eleanor; Ibaraki, A.; Nault, Jean–Charles

doi:10.4039/ent130337-3

Cited by 14 publications

(13 citation statements)

References 18 publications

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“…They concluded that this rise in JH was suggestive of a role for JH in coordinating reproduction on an unpredictable resource. The white pine weevil, Pissodes strobi, has been found to have reduced ovarian development on a poor oviposition resource, a reduction that could be corrected by the topical application of JH (Sahota et al 1998). Sahota et al (1998) concluded that feeding on the resistant oviposition resource disrupts the normal function of the JH system by way of an antibiotic mechanism of resistance.…”

Section: Discussionmentioning

confidence: 99%

“…The white pine weevil, Pissodes strobi, has been found to have reduced ovarian development on a poor oviposition resource, a reduction that could be corrected by the topical application of JH (Sahota et al 1998). Sahota et al (1998) concluded that feeding on the resistant oviposition resource disrupts the normal function of the JH system by way of an antibiotic mechanism of resistance. However, if P. strobi requires host encounter to stimulate the function of the JH system in the same way that burying beetles do, then it is possible that they are also a species where simple host quality and availability is driving the reproductive system.…”

Section: Discussionmentioning

confidence: 99%

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The pollen beetle, Meligethes aeneus, changes egg production rate to match host quality

Hopkins¹,

Ekbom²

1999

Oecologia

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Motivation-based models dominate current theory concerning host plant selection for oviposition by herbivorous insects. A female searching for a host plant will be more likely to accept a host which is of inferior quality for her offspring if motivation is high, e.g. a large eggload or long time since last oviposition. This implies that insects will accumulate eggs if exposed to hosts of low acceptability and after a time lay eggs on such hosts. An alternative strategy for insects when exposed to less acceptable hosts is to stop producing, instead of accumulating, eggs. Thus, resources would be saved until a more acceptable host is found. If this hypothesis is true, a herbivorous insect would cease egg production when exposed to hosts of low acceptability and resume egg production when exposed to hosts of high acceptability. Previous exposure should not affect oviposition rate when an insect encounters a new host of a different quality. In an earlier study pollen beetles, Meligethes aeneus (F.) (Coleoptera: Nitidulidae), did not accumulate eggs in the absence of high quality hosts. In this study we monitored the daily oviposition rate of female pollen beetles on hosts plants of low (Sinapis alba L.), intermediate (Brassica nigra Koch) or high (B. napus L.) acceptability over a 5-day period. Individuals were then switched to an oviposition resource of a different acceptability. Beetles moved from high- to low-acceptability plants reduced their oviposition rate considerably. In the opposite case, low to high acceptability, the rate of oviposition increased markedly after the switch. When M. aeneus were moved from the high-acceptability host to that of intermediate acceptability oviposition rate was modified accordingly. However, when moved to the intermediate host from a host of low acceptability oviposition on B. nigra was much less than would normally be expected. A possible mechanism for this finding is discussed. M. aeneus, by adjusting oviposition rate to host acceptability, maximizes the average host quality for offspring, even at the cost of a lower egg-laying rate.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The pollen beetle, Meligethes aeneus, changes egg production rate to match host quality

Hopkins¹,

Ekbom²

1999

Oecologia

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“…One example of such antibiosis was observed by Sahota et al (1998) who found that white pine weevils experienced ovarian regression when forced to feed on only resistant Sitka spruce. For C. lapathi, oviposition deterrence in resistant clones was most pronounced when oviposition levels in general were low, indicating that weevils were probably already experiencing suboptimal conditions.…”

Section: Discussionmentioning

confidence: 94%

Hybrid Poplar Clones with <I>Populus maximowiczii</I> Parentage Demonstrate Postoviposition Antibiosis to <I>Cryptorhynchus lapathi</I> (Coleoptera: Curculionidae)

Broberg¹,

Borden²

2005

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Damage caused by the poplar-and-willow borer, Cryptorhynchus lapathi (L.) (Coleoptera: Curculionidae), is reported to vary among hybrid poplar clones. We evaluated oviposition preferences and larval success in four hybrid poplars on potted and field-planted trees. Oviposition occurred somewhat less frequently and abundantly on two clones with Populus maximowiczii Henry parentage in field-planted and potted trees, and significantly fewer larvae survived to adulthood on those clones. No adults emerged from field-planted NM 6 (Populus nigra L. x P. maximowiczii) and four emerged from TM 256-28 (Populus trichocarpa Torrey & Gray x P. maximowiczii) on which male-female pairs of C. lapathi had been caged. In contrast, 50 and 140 adults emerged over the same 2-yr period from two susceptible clones (n = 20), TD 52-226 (P. trichocarpa x Populus deltoides Bartram ex Marshall) and TN 302-9 (P. trichocarpa x P. nigra), respectively. Thus, resistance expressed by clones with P. maximowiczii parentage partially involves decreased levels of oviposition, but more significantly, antibiosis in resistant clones prevents the development of larvae, probably in early spring.

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“…Adult female weevils may also feed on spruce foliage before selecting trees for ovipositing (Silver 1968), so the potential exists for antibiosis by the foliar alkaloids as well. Resistance appears to result, at least in part, from unidentiÞed water-soluble constituents of spruce bark that cause hormonal changes which inhibit egg production in female weevils (Leal et al 1997;Sahota et al 1998Sahota et al , 2001. We have found the piperidine alkaloids to be water-soluble (unpublished data) and constitutive in nature (Gerson and Kelsey 1998).…”

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confidence: 84%

Piperidine Alkaloids in Sitka Spruce with Varying Levels of Resistance to White Pine Weevil (Coleoptera: Curculionidae)

Gerson¹,

Kelsey²

2002

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Our objective was to evaluate piperidine alkaloids as potential resistance factors in Sitka spruce, Picea sitchensis (Bong.) Carr, at risk to attack by white pine weevils, Pissodes strobi (Peck). We sampled 72 seedlings in each of two replicated field trials in the Oregon Coast Range. The seedlings were grown from open-pollinated seeds of putatively "resistant" or "susceptible" off-site parental sources. Alkaloid concentrations in bark and foliage were measured in previously unattacked trees at the time of weevil host selection. Leader mortality was evaluated in the fall to gauge actual resistance in the sample trees. Five families had < or = 25% topkill and seven sustained >50% topkill. Alkaloid concentrations differed significantly among families, but the major alkaloids did not appear to be functionally linked with topkill or useful indicators of resistance. However, our study design did not address all potential resistance mechanisms. Therefore, before concluding that Sitka spruce alkaloids have no influence on white pine weevils, complementary laboratory and field experiments are needed.

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Resistance Against White Pine Weevil: Effects on Weevil Reproduction and Host Finding

Cited by 14 publications

References 18 publications

The pollen beetle, Meligethes aeneus, changes egg production rate to match host quality

The pollen beetle, Meligethes aeneus, changes egg production rate to match host quality

Hybrid Poplar Clones with <I>Populus maximowiczii</I> Parentage Demonstrate Postoviposition Antibiosis to <I>Cryptorhynchus lapathi</I> (Coleoptera: Curculionidae)

Piperidine Alkaloids in Sitka Spruce with Varying Levels of Resistance to White Pine Weevil (Coleoptera: Curculionidae)

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