Damage to Douglas-Fir Cones by Choristoneura occidentalis1

Dewey, Jerald E.

doi:10.1093/jee/63.6.1804

Cited by 13 publications

(10 citation statements)

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“…During epidemics, WSBW larvae may destroy cones and consume seeds (Dewey 1970). The percentage of budworm-damaged cones may vary from <10% to >90 percent depending on WSBW population levels (Dewey 1970).…”

Section: Western Spruce Budworm (Wsbw)mentioning

confidence: 99%

Natural variability of specific forest insect populations and their associated effects in Colorado /

Schmid¹,

Mata²,

Forest³

et al. 1996

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Section: Western Spruce Budworm (Wsbw)mentioning

confidence: 99%

Natural variability of specific forest insect populations and their associated effects in Colorado /

Schmid¹,

Mata²,

Forest³

et al. 1996

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“…Larvae of this moth feed on a variety of conifer species including Douglas-fir, Pseudotsuga menziesii var. Larvae may also attack cones of Douglas-fir destroying the seeds (Dewey 1970). Franco, grand fir, Abies grandis (Dougl.)…”

Section: Introductionmentioning

confidence: 99%

Early Ground Application of Acephate for Control of the Western Spruce Budworm (Lepidoptera: Tortricidae) on Douglas-Fir

Brewer

O'Neal

1977

Can Entomol

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Can. Ent. 109: 1153-1158 (1977) The insecticide acephate (0.5-dimethyl acetyl phosphoramidothioate) was applied at 0.5, 1 .O, and 1.5 Ib A.I./gal (.058, 0.118, 0.179 kgll.) in aqueous solution to individual Douglas-fir trees infested with western spruce budwom, Choristoneura occidentalis Freeman, larvae in central Washington using hand held ground application equipment. Application was made when larvae were in the needle miningbud mining stage at rates ranging from 2.58 to 5.10 gallacre (3.97 to 7.84 I./ha). For all three concentrations, mortality of larvae inside needles was 94-98% after 1 day compared with a check mortality of 18% and larval mortality inside buds was 99% after I day compared with 23% for the check. Regression analyses indicated that defoliation was positively correlated with the number of needles mined the current year and per cent punctured buds, and negatively correlated with larval mortality inside both needles and buds. The data suggest that when applied at the rates used, acephate has some type of systemic action and can provide foliage protection during the year of application.

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“…The young caterpillars start feeding on the needles but, in some species (e.g. C. lambertiana subretiniana, C. occidentalis, C. pinus ) the young first instar larvae quickly turn to flowers or cones (Stark and Borden, ; Dewey, ; Nealis and Lomic, ). The larvae spin a hibernaculum on the twigs, in which they overwinter.…”

Section: Pest Categorisationmentioning

confidence: 99%

Pest categorisation of non‐EU Choristoneura spp.

Bragard¹,

Dehnen‐Schmutz²,

Serio³

et al. 2019

EFS2

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The Panel on Plant Health performed a pest categorisation of non-EU Choristoneura spp. Choristoneura is a well-defined insect genus in the family Tortricidae (Insecta: Lepidoptera). Species can be identified using taxonomic keys and molecular methods. The genus includes 52 species and subspecies colonising conifers and non-conifer trees in many areas in the world, among which five species are present in the EU. The non-EU species are listed in Annex IAI of Council Directive 2000/29/EC as Choristoneura spp. (non-European). Some Choristoneura species are important defoliators in North America, mainly on conifers but also on several broadleaf tree species and on non-forest crops. Females lay eggs in batches on the needles or the leaves, and overwintering occurs at the larval stage in a silken hibernaculum. Most species are univoltine, some are bivoltine and at least one subspecies has a 2-year life cycle. Pupation occurs on the twigs of conifers or in folded leaves of broadleaf trees. The adults are strong flyers, and the larvae can disperse by ballooning. The main pathways for entry are plants for planting, cut branches, fruits of host plants (including cones), round wood with bark and bark. Suitable host plants and climate would allow the establishment in the EU of the known, North American harmful species. Non-EU Choristoneura spp. satisfy all the criteria to be considered as Union quarantine pests. Measures are in place to prevent the introduction of non-EU Choristoneura spp. through the pathways described above. As non-EU Choristoneura spp. are not present in the EU and plants for planting are not the major pathway for spread, non-EU Choristoneura spp. do not meet the criteria to be considered as regulated non-quarantine pests.

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Damage to Douglas-Fir Cones by Choristoneura occidentalis1

Cited by 13 publications

References 0 publications

Natural variability of specific forest insect populations and their associated effects in Colorado /

Natural variability of specific forest insect populations and their associated effects in Colorado /

Early Ground Application of Acephate for Control of the Western Spruce Budworm (Lepidoptera: Tortricidae) on Douglas-Fir

Pest categorisation of non‐EU Choristoneura spp.

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