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Light brown apple moth

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For the other moth with the same common name, see Clepsis virescana.

Light brown apple moth
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Tortricidae
Genus: Epiphyas
Species:
E. postvittana
Binomial name
Epiphyas postvittana
(Walker, 1863)[1]
Synonyms
List
  • Teras postvittana Walker, 1863[2]: 297 
  • Teras basialbana Walker, 1863[2]: 299 
  • Pandemis consociana Walker, 1863[2]: 311–312 
  • Tortrix dissipata Meyrick, 1922
  • Dichelia foedana Walker, 1863[2]: 321–322 
  • Tortrix oenopa Meyrick, 1910
  • Tortrix phaeosticha Turner, 1939
  • Tortrix pyrrhula Meyrick, 1910
  • Dichelia retractana Walker, 1863[2]: 322–323 
  • Dichelia reversana Walker, 1863[2]: 321 
  • Teras scitulana Walker, 1863[2]: 298–299 
  • Teras secretana Walker, 1863[2]: 300 
  • Tortrix stipularis Meyrick, 1910
  • Dichelia vicariana Walker, 1869
  • Dichelia vicaureana Bradley, 1956

The light brown apple moth (Epiphyas postvittana) (often abbreviated to LBAM) is a leafroller moth belonging to the lepidopteran family Tortricidae.

Identification

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Adult moths

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Light brown apple moth adults are variable in colour and may be confused with other leafroller moths and similar species. DNA analysis is currently required to positively identify the species which are otherwise indistinguishable on gross characteristics from other moths of similar species. Typical males have a forewing length of 6–10 mm with a light brown area at the base, which is distinguishable from a much darker, red-brown area at the tip. The latter may be absent, with the moth appearing uniformly light brown, as in the females, which have only slightly darker oblique markings distinguishing the area at the tip of the wing. Females have a forewing length of 7–13 mm.

  • Female, dorsal view
    Female, dorsal view
  • Female, ventral view
    Female, ventral view
  • Male, dorsal view
    Male, dorsal view
  • Male, ventral view
    Male, ventral view

Larvae

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Larvae are not easily distinguished from the larvae of other tortricid leafrollers; only DNA testing is a certain identification method. The first larval instar has a dark brown head; all other instars have a light fawn head and prothoracic plate. Overwintering larvae are darker. First instar larvae are approximately 1.6 mm long, and final instar larvae range from 10 to 18 mm in length. The body of a mature larva is medium green with a darker green central stripe and two side stripes.

  • E. postvittana 5th instar larva
    E. postvittana 5th instar larva

Distribution

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The light brown apple moth is a native insect of Australia. It has been introduced and now also lives in New Caledonia, the British Isles, Hawaii (since 1896), and New Zealand. In March 2007 the moth was positively identified in California by DNA samples across hundreds of miles, from Los Angeles to Napa, north of San Francisco.

Life cycle

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Light brown apple moth pass through three generations annually with a partial fourth generation in some years. The moth has no winter resting stage. There is considerable overlap in the generations. In warmer areas, four or even five generations are completed annually, with major flight periods occurring during September–October, December–January, February–March, and April–May. In cooler climates, the number of complete generations may be reduced to two.

Eggs are laid in clusters of 3–150 on leaves or fruit. A single female might lay hundreds of eggs. Adults produced by the overwintering larval generation emerge during October and November. These give rise to the first summer generation, in which final instar larvae mature between January and mid February. Second generation larvae reach maturity during March and April, and the adults from this generation provide third generation eggs. Normally, the rate of larval development is slowed considerably during the winter, particularly when temperatures approach freezing; thus the majority of larvae over-winter in the prolonged early juvenile phases of the second third, and fourth instars. During this period they normally feed on herbaceous plants. Re-invasion of apple trees takes place during October–December, when moths of the third generation start laying eggs again on apple leaves.

Sex pheromone

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Females release a specific blend of sex pheromone to attract males. The blend is a mixture of two compounds (E)-11-tetradecen-1-yl acetate, comprising 95% of the mixture and (E,E)-9,11-tetradecadien-1-yl acetate comprising the remaining 5%.[3] As an attractant used in moth traps, the synthetic versions of these pheromones are highly specific. Only very closely related species of moths are attracted to the pheromone's scent.[4]

Diet and damage

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The insect is regarded as an herbivorous generalist, and the larvae feed on numerous horticultural crops in Australia and New Zealand, where they have limited natural predators. It is known to feed on 123 dicotyledonous plant species, including 22 Australian natives, belonging to 55 different families. In New Zealand, over 250 host species have been recorded, including Pteridium esculentum.[5] It feeds on nearly all types of fruit crops, ornamentals, vegetables, glasshouse crops, and occasionally young pine seedlings.[6]

The larvae cause significant damage to foliage and fruit.[7] Early instars feed on tissue beneath the upper epidermis (surface layer) of leaves, while protected under self-constructed silken webs on the undersurface of leaves. Larger larvae migrate from these positions to construct feeding niches between adjacent leaves, between a leaf and a fruit, in the developing bud, or on a single leaf, where the leaf roll develops. The late stage larvae feed on all leaf tissue except main veins, and can often be found tunneling into berry fruits such as strawberries and caneberries.

Superficial fruit damage is common in apple varieties which form compact fruit clusters, though more significant damage may also occur such that crops are no longer commercially viable. Leaves are webbed to the fruit and feeding injury takes place under the protection of the leaf; or larvae spin up between fruits of a cluster. Internal damage to apple, pear, and citrus fruits is less common, but a young larva may enter the interior of an apple or pear fruit through the calyx or beneath the stem of a citrus fruit. Excreta are usually ejected on to the outside of the fruit.

In sharp contrast to most affected regions, the Hawaii Department of Agriculture says the moth "has not been a significant pest in Hawaii" and finds it beneficial in a few cases, because it kills some invasive plants, including gorse and blackberry.[8]

In April 2008, an attorney for the California Department of Agriculture acknowledged in court papers that there were "no documented crop losses in California at this time".[9]

Control

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The species has been classified as a noxious insect in the United States and Canada, leading to restrictions on produce from counties with substantial populations. Typical orchard control of the insect commonly involves Integrated Pest Management (IPM) regimes using a variety of methods such as insecticide applications and application of horticultural oils to smother insects and egg masses, biological control including Bacillus thuringiensis (BT) and occasionally mating disruption, which typically involves releasing synthetic insect pheromones to confuse the male moth's tracking of female scent. This results in fewer fertile pairings and thus fewer offspring. Sex pheromone lures are also often used to assess and monitor populations of moths in specific areas. In California, a range of native parasitoids and predators have been found to attack the eggs and larval stages.[10][11]

Control measures in Australia and New Zealand

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The moth is native to Australia,[12] and its natural predators keep the population in check. It is a pest in New Zealand where various measures, including using natural enemies, insecticides and pheromones (to disrupt mating), have been taken for more than a decade.[13]

Natural enemies of the moth include species of tachinid fly and ichneumonid wasp. These are parasitoids which deposit their eggs on or within the bodies of the moth larvae. The parasitoid larva hatches and consumes the interior of the moth larva's body, killing the pest larva. Historically, the most abundant parasitoid has been the braconid wasp Dolichogenidea tasmanica, and it is still the most common natural enemy found with the moth in New Zealand.[14] This wasp, like the moth, is native to Australia and was probably imported along with it.[14] Other common parasitoids include the tachinid fly Trigonospila brevifacies, the braconid wasp Glyptapanteles demeter, and the bethylid wasp Goniozus jacintae.[14] The combination of these parasitoids have played a role in reducing moth damage.[14]

Eradication measures in California

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Main article: Light brown apple moth controversy

It is unknown how long LBAM has been present in California, though the first was identified in early 2007,[15] and widespread confirmed insect captures had been found across much of the coastal region of the state soon after. By 2008, almost 20,000 moths had been found in California, and more than half of them were in Santa Cruz County.[16] The California Department of Food and Agriculture and other organizations were concerned that the moth could cause more than half a billion dollars' worth of damage to California's crops if left unchecked.[17]

After the moth was confirmed to be present in California according to DNA testing, quarantine programs to prevent the spread of the Class A pest required farmers to pay for additional agricultural inspections and made it difficult to ship fruits and vegetables to other areas.[18] Soon after, a controversial program of aerial spraying proprietary synthetic pheromones over urban and suburban areas was planned. This was expected to be a five- to seven-year program.[19] USDA officials obtained an Emergency Exemption from Registration from the U.S. Environmental Protection Agency that allowed them to bypass state rules for the use of pesticides,[20] such as the production of an environmental impact report, that would normally be required. Less controversial efforts included nursery and grower treatment of potential infestations in plants using graduated integrated pest management (IPM) techniques with insecticides, smothering oils, and biologic controls such as Bacillus thuringiensis.

Public outcry over the aerial spraying plans was significant and centered on a fear of unknown health effects as well as general distrust of the government's claims that control measures were necessary and that the pheromone would be safe.[21] After duplicates were removed, 453 complaints of adverse health effects in humans were received.[22][23][24] However, many of the complaints were received when the spraying had been unexpectedly postponed due to fog[25] and provided incomplete information,[22] and the overall number of reports were small compared to the number of adults who would be expected to experience symptoms like irritated eyes or wheezing during a typical week,[26][27][28] leading many, including a judge hearing a lawsuit about the spraying,[29] to conclude that the reports were unrelated to spraying. In June 2008, the California Department of Food and Agriculture announced that it was abandoning plans for aerial spraying over population centers in favor of using local application of pheromone-impregnated twist-ties, a control measure that had proven effective in New Zealand.[30] In December 2015, an appeals court ruled against the LBAM pesticide program on the grounds that it violated state environmental laws.[31]

Five years after the first light brown apple moth was found in California, the state eliminated funding for inspection and monitoring, due to the statewide budget problems in 2012.[15] The federal government funded the inspection program, and farmers were left to use pesticides to kill moth infestations at their own expense.[15]

References

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  1. ^ tortricidae.com
  2. ^ a b c d e f g h Walker, Francis (1863). Tortricites & Tineites. List of the Specimens of Lepidopterous Insects in the Collection of the British Museum. Vol. 38. London: Edward Newman.
  3. ^ Bellas, T. E.; Bartell, R. J.; Hill, A. (1983). "Identification of two components of the sex pheromone of the moth, Epiphyas postvittana (Lepidoptera, Tortricidae)". Journal of Chemical Ecology. 9 (4): 503–512. doi:10.1007/BF00990222. PMID 24407457. S2CID 33185947.
  4. ^ Powell, Jerry A. (2009). Encyclopedia of Insects (2nd ed.). Academic Press. p. 577.
  5. ^ Andrew Crowe (2004). Life-Size Guide to New Zealand Native Ferns: Featuring the unique caterpillars which feed on them. p. 18. ISBN 0-14-301924-4. Wikidata Q115211440.
  6. ^ Thomas, W. P. (1989) Epiphyas postvittana (Walker), light brown apple moth (Lepidoptera: Tortricidae). Pages 187-195 of: A review of biological control of invertebrate pests & weeds in New Zealand (Cameron, P. J., Hill, R. L., Bain, J. and Thomas, W. P., eds) CAB International, London.
  7. ^ Wearing, C. and Thomas, W. and Dugdale, J. and Danthanarayana, W. (1991) Tortricid pests of pome and stone fruits, Australian and New Zealand species. Pages 453-472 of: Tortricid pests, their biology, natural enemies and control (Van der Geest, L. P. S. and Evenhuis, H. H., eds) Vol 5. Elsevier Amsterdam ISBN 0-444-88000-3.
  8. ^ "News Release - NR07-09 - May 2, 2007 — Hawaii Department of Agriculture". Retrieved 27 February 2008. [dead link]
  9. ^ California Department of Agriculture's "Brief in Opposition to Petition for Writ of Mandate" California Superior Court Case M86553, Page 10
  10. ^ "Light Brown Apple Moth in California: A Diversity of Host Plants and Indigenous Parasitoids". ResearchGate. Retrieved 7 September 2019.
  11. ^ Mills, Nicholas J.; Bürgi, Linda P. (2013). "Lack of enemy release for an invasive leafroller in California: temporal patterns and influence of host plant origin". Biological Invasions. 16 (5): 1021–1034. doi:10.1007/s10530-013-0554-4. S2CID 13894927. Retrieved 7 September 2019.
  12. ^ EPA Quarantine Exemptions for Light Brown Apple Moth Pheromones
  13. ^ Jane Kay (6 March 2008). "Experts question plan to spray to fight moths". sfgate.com.
  14. ^ a b c d Varela, L. G., et al. (2010). New Zealand lessons may aid efforts to control light brown apple moth in California. California Agriculture 64:1 6-12.
  15. ^ a b c Rogers, Paul (9 February 2012). "Five years after the light brown apple moth scare, California quietly stops funding moth-control programs". Santa Cruz Sentinel. Retrieved 11 August 2023.
  16. ^ Seals, Brian (29 February 2008). "Moth lawsuit hearing delayed for two months" Santa Cruz Sentinel.  p. A3.  "Some 17,019 light brown apple months have been recorded in the state, with 10,944 of them in Santa Cruz County, according to the state Department of Food and Agriculture."
  17. ^ Ragan, Tom (7 November 2007). "Santa Cruz moth spraying grounded again". The Mercury News. Retrieved 11 August 2023.
  18. ^ Seals, Brian (13 March 2008). "LBAM threat questioned; state warns of tighter restrictions". Santa Cruz Sentinel. Retrieved 11 August 2023.
  19. ^ Carey, James R.; Harder, Daniel (2013). "Clear, Present, Significant, & Imminent Danger Questions for the California Light Brown Apple Moth (Epiphyas postvittana) Technical Working Group". American Entomologist. 59 (4): 240–247. doi:10.1093/ae/59.4.240. ISSN 2155-9902.
  20. ^ Bills seek to curb pesticide spray over cities
  21. ^ Vo, Kim (15 October 2007). "Alarm raised in Santa Cruz over spraying for voracious moth". The Mercury News. Retrieved 11 August 2023.
  22. ^ a b Department of Pesticide Regulation (10 April 2008). "Summary of Symptom Reports in Areas of Aerial Pheromone Application for Management of the Light Brown Apple Moth in Monterey and Santa Cruz Counties, September, October, and November 2007" (PDF). Office of Environmental Health Hazard Assessment, California Department of Public Health. Retrieved 11 August 2023.
  23. ^ McCord, Shana (5 January 2008). "Group alleges hundreds got sick after moth spraying". Santa Cruz Sentinel. Retrieved 11 August 2023.
  24. ^ Alexander, Kurtis (9 November 2007). "Aerial spraying may be over – for now – in Santa Cruz". The Mercury News. Retrieved 11 August 2023.
  25. ^ "Santa Cruz Sentinel - Extra". Retrieved 23 February 2008.[permanent dead link]
  26. ^ Department of Pesticide Regulation (10 April 2008). "Summary of Symptom Reports in Areas of Aerial Pheromone Application for Management of the Light Brown Apple Moth in Monterey and Santa Cruz Counties, September, October, and November 2007" (PDF). Office of Environmental Health Hazard Assessment, California Department of Public Health. Retrieved 11 August 2023.
  27. ^ Department of Pesticide Regulation (10 April 2008). "Summary of Symptom Reports in Areas of Aerial Pheromone Application for Management of the Light Brown Apple Moth in Monterey and Santa Cruz Counties, September, October, and November 2007" (PDF). Office of Environmental Health Hazard Assessment, California Department of Public Health. Retrieved 11 August 2023.
  28. ^ Bookwalter, Genevieve (20 June 2008).  "Moth spray plans halted."  Santa Cruz Sentinel.  pp. A1, A10.  "Several hundred people in Santa Cruz and Monterey counties complained of respiratory problems and other ailments after last year's aerial spraying, though state toxicologists have said that those complaints cannot be conclusively linked to the spraying because in a large population, a certain number of people experience similar health problems every day."
  29. ^ Ragan, Tom (10 December 2007). "Apple moth spraying opponents gather to discuss strategy". Santa Cruz Sentinel. Retrieved 11 August 2023.
  30. ^ Jane Kay, Chronicle Environment Writer (19 June 2008). "Officials Call Of(f) Aerial Spray for Apple Moth". sfgate.com.
  31. ^ HEALTH, ENVIRONMENTAL GROUPS WIN VICTORY IN APPLE MOTH PESTICIDE LAWSUIT
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