Paralobesia viteana

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Grape berry moth
Paralobesia viteana - Grape Berry Moth (14275283321).jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Tortricidae
Genus: Paralobesia
Species:
P. viteana
Binomial name
Paralobesia viteana
(Clemens, 1860)
Synonyms
  • Endopiza viteana [1] Clemens, 1860
  • Penthina vitivorana Packard, 1869

Paralobesia viteana, [lower-alpha 1] the grape berry moth, is a moth of the family Tortricidae, found in Eastern North America and western Colorado, where it is an important agricultural pest in vineyards. The synonym Endopiza viteana is frequently used in literature, but was replaced by Paralobesia viteana per J.W. Brown (2006). [1]

Contents

Description

Caterpillar

Newly hatched larvae are about 1 mm long and creamy white [2] or yellow-green [1] in appearance. They turn purple as they mature and grow to a length of roughly 8 mm. [2]

Adult

The wingspan of adult Paralobesia viteana specimens ranges from 8 to 13 mm. [2] The forewings are brown with a mild purplish sheen and a band in the middle of the wing, [3] with a wing pattern similar both to other Nearctic species of Paralobesia and to Lobesia botrana , with the latter unable to be separated from P. viteana on wing pattern alone. [4] The lighter hindwings, which are more cream-colored, are folded beneath the forewings when in rest. The head and body of P. viteana are brown.

Range and host plants

Paralobesia viteana is native to Eastern North America, with wild grape as ancestral host plant. In recent times, it has also been observed in western Colorado. [4] The primary host plant in both areas is grape ( Vitis spp. ), both wild and cultivated variations, though documentation of P. viteana on other host plants, including sassafras and blackberry, exists. [4] Because of the damage done by the larvae when feeding from the grape berries and blossoms, P. viteana is considered to be one of the worst insect pests on grape berries in the Eastern North American bioregion. [1] [5] [6]

Behaviour

Depending on weather and location, P. viteana occurs in two to four generations per year, [4] with generations above a second being more common in the southern areas of its range but occasionally happening in the northern areas as well. [5] The last generation overwinters in the pupal stage. [4] Adults of the various generations of P. viteana are on wing from roughly March to August, depending on the weather and location.

The adults of the first flight emerge, after overwintering, during spring around the time of grapevine bloom. The females lay the eggs of the first generation separately on flowers or small berries. [1] After about four to eight days the eggs hatch. [2]

The first generation larvae feed on flowers, growing fruit clusters and tender stems from the outside, webbing the developing cluster together. As the caterpillars reach maturity, they leave the cluster to pupate by cutting part of a leaf and wrapping it around themselves to create a cocoon. [4] Occasionally, they pupate within a webbed cluster.

The later generations of larvae do not feed externally, but tunnel into the berries, feeding from within. This causes red spots on the grape berries at the point of entry. Grapes affected in such a way are known as "stung" berries. [5] A single caterpillar may go through two to six berries before pupating. Although early larvae of the first generation may cause serious damage by feeding on the blossoms, buds and developing berries, [7] the later generations often cause the majority of damage to the grape harvest [8] [9] by causing parts of berries to ripen early and hollowing out berries, both reducing yield and increasing the risk of fungal infection and infection by fruit flies. [7]

Larvae of the last generation overwinter in the pupal stage on the ground, in leaf litter.

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References

  1. Paralobesia, "like the moth genus Lobesia "; viteana, "of Vitis ", the grapevine.
  1. 1 2 3 4 5 Isaacs, Rufus; Teixeira, Luis A.F.; Jenkins, Paul E.; Neerdaels, Natalia Botero; Loeb, Greg M.; Saunders, Michael C. (26 June 2012). "Chapter 15: Biology and Management of Grape Berry Moth in North American Vineyard Ecosystems". In Bostanian, Noubar J.; Vincent, Charles; Isaacs, Rufus (eds.). Arthropod Management in Vineyards: Pests, Approaches, and Future Directions. Springer. ISBN   978-9400740327 . Retrieved November 13, 2013.
  2. 1 2 3 4 "University of Minnesota". Archived from the original on 2013-11-13. Retrieved 2013-11-13.
  3. Oklahoma State University: Entomology and Plant Pathology - Grape Berry Moth factsheet
  4. 1 2 3 4 5 6 Tortricids of Agricultural Importance: Paralobesia viteana factsheet
  5. 1 2 3 Ohio Agricultural Research and Development Center
  6. Michigan State University Extension - North Central Region Grape Pest Management Strategic Plan, 2007 Archived 2013-11-13 at the Wayback Machine
  7. 1 2 New York State Integrated Pest Management Program
  8. Jackson, Ronald S. (30 April 2008). Wine Science: Principles and Applications. Academic Press. p. 204. ISBN   9780123736468 . Retrieved 14 November 2013.
  9. Texas Winegrape Network