Indianmeal moth

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Indianmeal moth
Plodia interpunctella - Indianmeal moth.jpg
Plodia interpunctella adult.JPG
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Family: Pyralidae
Tribe: Phycitini
Genus: Plodia
Guenée, 1845
Species:
P. interpunctella
Binomial name
Plodia interpunctella
(Hübner, [1813])
Synonyms

Many, see text

The Indianmeal moth (Plodia interpunctella), also spelled Indian meal moth and Indian-meal moth, is a pyraloid moth of the family Pyralidae. Alternative common names are hanger-downers, weevil moth, pantry moth, flour moth or grain moth. The almond moth (Cadra cautella) and the raisin moth ( Cadra figulilella ) are commonly confused with the Indian-meal moth due to similar food sources and appearance. The species was named for feeding on Indian meal or cornmeal, and does not occur natively in India. It is also not to be confused with the Mediterranean flour moth (Ephestia kuehniella), another common pest of stored grains.

Contents

P. interpunctella larvae (caterpillars) are commonly known as waxworms. It is important to note that they are not the same species as the waxworms often bred as animal feed. Rather, they are a common grain-feeding pest found around the world, consuming cereals, fruits, and similar products. Substantial efforts have been taken in the United States to control the moth's damage to grain crops. [1]

The larvae of this species have the ability to bite through plastic and cardboard so even sealed containers may be infested. [2] Once found, the moths are difficult to eradicate. The last larval instar is also able to travel long distances before pupating; so a new infestation site may develop far from the last pupation site. [3] In addition to food sources, this species can reproduce and pupate on clothing and any source of clothing must be inspected to prevent reinfestation.

Pantry moth life cycle, reproducing in a single cotton T-shirt inside a drawer. Pantry moth life cycle, reproducing in a single cotton T-shirt inside a drawer.jpg
Pantry moth life cycle, reproducing in a single cotton T-shirt inside a drawer.

Distribution and habitat

Plodia interpunctella is found on every continent in tropical habitats, excluding Antarctica. [4] Within the United States, the moth is most commonly found in Florida, where it thrives in the tropical habitat. [3] The moth lives in a wide range of conditions, making it a persistent pest. It is often found at food storage facilities worldwide, specifically in grain bins or grain storage buildings. [5]

Taxonomy and etymology

The Indian-meal moth is the only known living species of the genus Plodia. It is closely related to the genera Cadra and Ephestia, which include other pest species like E. kuehniella, also known as the "flour moth". [6] [7]

The species has been described under a number of junior synonyms, which may occasionally still be found in non-entomological sources. [7]

The common name, "Indian-meal moth", for this species was coined by Asa Fitch, an entomologist employed by the state of New York in the 19th century. In a report published in 1856, Fitch discussed the species, noting that the larvae had been observed to infest stores of cornmeal, which at the time was referred to as "Indian meal". [8]

Description

Adults are 8–10 millimetres (5⁄16–13⁄32 in) in length with 16–20 millimetres (5⁄8–13⁄16 in) wingspans. The distal two thirds of their forewings are generally reddish brown in color with a copper luster. They can also be bronze or dark gray. The more proximal parts of the wings are yellow-gray or white-gray, with a dark band at the intersection between the proximal and distal regions. The hindwings, in general, are uniformly gray. [9]

The eggs of the Indian-meal moth are white, ovate, and very small. It is difficult to see them with the naked eye. Newly hatched larvae are equally difficult to see. They are mostly off-white in color, have brown heads, and develop through five to seven larval instars. When these larvae mature, they measure about 12–14 millimetres (15⁄32–9⁄16 in) long. Larvae also have three sets of legs near the head and five sets of prolegs protruding from the abdomen. The legs help the larvae move over long distances in order to find pupation sites. [9]

Food resources

Indian-meal moths feed on plants, grains, and other human food products.

Plant-based foods

Moths feed on many plant-based foods including dry pet food (plant based), birdseed, cereal, soup mixes, bread, pasta, rice, flour, spices, dried fruits and nuts. There is strong evidence that the northern Manitoba wheat supports the development of the moth. Other optimal diets include sultanas, American yellow corn and almonds. Groundnuts and maize meal, on the other hand, result in a longer development time for the moths. [10]

Non-plant foods

Indian-meal moths are also known to cannibalize larvae but this often leads to viral granulosis infections spreading through an Indian-meal moth population. Healthy larvae are picked more often than unhealthy larvae for cannibalism. [11] There appears to be no kin discrimination and siblings can be eaten by caterpillars. [12]

Foraging flights

Though Indian-meal moths generally do not migrate over long distances, they do engage in long-distance foraging flights. These flights take place during the twilight hours during which blue light (400–475 nm) rather than UV light (10–400 nm) is dominant and attracts the moths. Blue light's role in the Indian-meal moth foraging behavior has recently been harnessed as a form of pest control since it is attractive to the moth. [13]

Life history

Eggs

Usually the life cycle of an Indian-meal moth colony starts in a location where grain is present. The temperature within a grain bin must exceed 50 °F (10 °C). The eggs of the moth are grayish white and have a length between 0.3 and 0.5 millimetres (1⁄64 and 3⁄128 in). Eggs can be laid directly on the food source singly or in groups of between 12 and 30. A mature female may lay between 100 and 300 eggs at a time. [1]

Larvae

Larvae begin to hatch in approximately two to fourteen days. The larvae have between five and seven instars. Newly hatched larvae feed on grain while more mature larvae feed on grain germ. The larvae are an off-white color, but can be pink, brown, or greenish. They are about 12 mm long and have prolegs for movement. Fully-grown larvae are able to spin webs and leave silk threads in their path of travel. Mature larvae that make silk also make threaded cocoons. [1]

Adults

The pupae are often seen on grain surfaces and on the walls of grain bins. The adults emerge in four to ten days. They then mate and the cycle begins again. [1] The entire life cycle of this species ranges between 30 and 300 days. A typical life cycle is 50 days. Under optimal conditions a life cycle can be as short as 28 days but cooler winter months prohibit this. Seven to nine generations of moths can live in a year. [3] [9]

Diapause

Diapause is defined as a delay in animal development due to certain external factors [14] and can end once the adverse environmental conditions wear off. The duration of diapause can vary in Indian-meal moths. Diapause is especially prevalent late in the breeding season. During the egg stage, if the temperature of the moth's environment exceeds 25 °C (77 °F), it can cause a delay in hatching. In the moth's early larval stage, temperatures of below 20 °C (68 °F) can cause a similar diapause. Different strains of P. interpunctella have differing tendencies to enter diapause. [15]

Enemies

Predators

Parasites

Diseases

Immunity

Indian-meal moths are developing a resistance to many kinds of biological agents, such as the granulosis virus. Use of pest control agents can cause resistance to these agents to be selected for in populations of Indian-meal moths. In populations exposed to the granulosis virus, it was found that the moths were 96 times more resistant to the virus. This led to the prohibition of many such biological agents. [18]

Regulations prevent the use of many pesticides near food sources so these pests are highly suitable for control with natural predators. [19]

Mating

Male-male interactions

Sperm competition

Females mate multiple times, so sperm competition could be an important aspect of male-male competition for being reproductively successful. Males have a limited number of sperm and allocate it depending on various factors. Male Indian-meal moths ejaculate a greater amount of sperm to females that have mated multiple times previously. This is to ensure a greater chance of success in sperm competition in the females' storage organs. Males also ejaculate more sperm when mating with a younger female. [20]

Food and pupation site competition

The most common type of competition in Indian-meal moths is due to a lack of food. This competition can change the timing of male and female emergence, reducing the chance of early males finding females to mate with, which could encourage emigration. [21] This is considered a form of male-male competition because males that emerge at an appropriate time are more likely to be reproductively successful with the surrounding females.

Males are also involved in finding pupation sites. If the larvae do not find pupation sites in the food layer, they may wander long distances to find one. This competition to find a pupation site affects males more than it does females, it indirectly impacts females as well because it results in a delayed population of males to mate with. [21]

Female-male interactions

Female pheromones

In the Indian-meal moth, mating occurs a few days after the adult moth emerges from the silk cocoon. Mating rituals are largely limited to pheromones release by the female. There are four identified (via mass spectrometry techniques) primary pheromones in the female pheromone blend: (Z,E)-9,12-tetradecadienyl acetate, (Z,E)-9,12-tetradecadienal, (Z,E)-9,12-tetradecadienol, and (Z)-9-tetradecenyl acetate. These pheromones are attractants to male moths. Removing any one component of the blend reduces the activity of the pheromone and the number of males attracted. Other components of the pheromone blend are also known but their functions are unclear. It has been suggested the reason for having so many components to the pheromone is that it ensures species specificity. [22]

Male pheromones

Male moths also release pheromones. After approaching the female from the back, the male releases a pheromone from wing glands located at the base of each forewing. These pheromones induce the female to remain stationary in the acceptance posture (raised abdomen between wings) which facilitates copulation. [23]

Copulation and multiple mating

Indian-meal moths are known to mate multiple times. For males, it is vital to ensure paternity after copulation. To ensure this trait, males who mate with a female first (before any other males) will insert a large package of spermatophore, accessory gland fluids, and nutrients into the bursa copulatrix of the female during copulation. Other donations after the first mating are smaller in size. Even so, there is no change in postcopulatory behavior in females after this large donation (with respect to pheromone production and calling behavior). [24]

Changes in fecundity

It has been observed in many insects that vital resources are tracked using odor plumes. [25] For the Indian-meal moth these odors have other effects as well. The Indian-meal moth's fecundity and fertility was found to be enhanced in the presence of the odor of vital nutrients. This effect is thought to be genetic since it is not related to parental generations or previous experiences in the lifetime of the moth. Females also show a strong preference towards laying their eggs near the site of the odor. It was observed that without antennae, this effect is lost, suggesting that there are olfactory receptors in the antennae. [26]

Interspecific courting

The Indian-meal moth often takes part in interspecific courtship especially with the almond moth (Cadra cautella). Successful mating between the species does not happen due to multiple isolation mechanisms. The main mechanism that has been identified is the male sex pheromone. This pheromone is a strong species recognition signal. It allows the almond moth to differentiate between members of its own species and members of the Indian-meal moth species. There are also mechanical barriers to insemination that render the species incompatible. Their courtship behaviors are also relatively incompatible. Thus, copulation rarely occurs. [27]

Even when courtship does continue to a later stage, the female of the other species rejects the male due to the wrong pheromone being released at the wrong time from scent scales. Even with these fail safes, some male almond moths are still excited by Indian-meal moth females. They may be able to successfully copulate, but insemination is not possible. [27]

Pest status and pest control

Damage to sunflower seeds Plodia interpunctella damage.jpg
Damage to sunflower seeds

Status

Indian-meal moth larvae can infest a wide range of dry foodstuffs of vegetable origin, such as cereal, bread, pasta, rice, couscous, flour, spices, dried fruits, and nuts. More unusual recorded foods include crushed red pepper, chocolate and cocoa beans, coffee substitute, cookies, dried mangelwurzel, and even the toxic seeds of jimsonweed (Datura stramonium). They have also been known to infest commercial pet food, such as cracked corn used for bird feed. They often leave webbing in the food they infest. [3] [28]

Control

Hidden inside a single cotton T-shirt, pantry moths can pupate to adult form. Pantry moth life cycle, reproducing in a single cotton T-shirt inside a drawer.jpg
Hidden inside a single cotton T-shirt, pantry moths can pupate to adult form.

After larvae or moths have been found, it is important to throw out all food sources not in very tightly sealed containers. Moth larvae can chew through plastic bags and thin cardboard, so even unopened packages may become infested. [2] They are also notoriously difficult to get rid of[ citation needed ], and can crawl on ceilings and spin cocoons in rooms other than where they hatched. Last instar larvae are able to travel significant distances before they pupate. When seeking the source of an infestation, the search thus cannot be limited to the immediate area where pupae are discovered. [3] Pantry moths can use clothing (remaining hidden) to reproduce and pupate, so it is important to inspect any source of clothing material.

None of the stages of the organism (eggs, larvae, adults) are temperature tolerant and can be killed by a week of freezing or by brief heating in a microwave or conventional oven when such treatment is practical. [9] Scrubbing infested areas with a mixture of soap and water or vinegar is also effective. [29]

Nontoxic traps are available to monitor outbreaks. One type of trap is a triangular box with a pheromone lure and sticky walls inside. These traps are known as pheromone traps. Male moths are attracted by the female pheromone (the lure) and stick against the sticky walls inside the box. [30]

The efficiency of traps is doubtful as they only capture males, and usually only a fraction of them, while adult females, eggs and larvae are unaffected, enabling a possible reinfestation. It is most effective to treat the infestation by eliminating the source and any affected food items, interrupting their mating processes, and repelling them from the areas where dried food and grains are kept. It is recommended to first eliminate the source of infestation followed by larvae, eggs, and eventually moths. [31]

The caterpillars are parasitized by Habrobracon hebetor , a braconid wasp which is a potential biological control agent. [32]

Additionally, blue to violet light can be very effective in drawing moths out, which suggests that the deployment of violet light could become another pest control tactic for these moths. [13]

Related Research Articles

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References

  1. 1 2 3 4 "Indian Meal Moth (Department of Entomology)". Department of Entomology (Penn State University). Retrieved 2 October 2017.
  2. 1 2 "National Pesticide Information Centre" . Retrieved 1 September 2016.
  3. 1 2 3 4 5 Fasulo, Thomas R. & Knox, Marie A. (2009): University of Florida Featured Creatures – Indianmeal moth, Plodia interpunctella Hübner. Version of December 2009.
  4. ↑ Mohandass, S; Arthur, F; Zhu, K; Throne, J (2007). "Biology and management of Plodia interpunctella (Lepidoptera: Pyralidae) in stored products". Journal of Stored Products Research. 43 (3): 302–311. doi:10.1016/j.jspr.2006.08.002. ISSN   0022-474X.
  5. ↑ Fasulo, Thomas; Knox, Marie (November 2015). "indianmeal moth". Featured Creatures. university of Florida. Retrieved 10 November 2017.
  6. ↑ Horak, M. (1994). "A Review of Cadra Walker in Australia: Five New Native Species and the Two Introduced Pest Species (Lepidoptera: Pyralidae: Phycitinae)". Australian Journal of Entomology. 33 (3): 245–262. doi:10.1111/j.1440-6055.1994.tb01226.x.
  7. 1 2 References in Savela, Markku (2009): Markku Savela's Lepidoptera and Some Other Life Forms – Plodia. Version of 9 April 2010. Retrieved 10 April 2010.
  8. ↑ Fitch, Asa (1856) First and Second Report on the Noxious, Beneficial and other Insects of the State of New York. C. Van Benthuysen, Albany, USA.
  9. 1 2 3 4 Lyon, William F. (2006): Ohio State University Insect and Pest Fact Sheets – HYG-2089-97: Indianmeal Moth. Version of 31 August 2006.
  10. ↑ Williams, Gwyneth (June 1964). "The life-history of the Indian meal-moth, Plodia interpunctella (Hübner) (Lep. Phycitidae) in a warehouse in Britain and on different foods". Annals of Applied Biology. 53 (3): 459–475. doi:10.1111/j.1744-7348.1964.tb07259.x.
  11. 1 2 Boots, Michael (1 May 1998). "Cannibalism and the stage-dependent transmission of a viral pathogen of the Indian meal moth, Plodia interpunctella". Ecological Entomology. 23 (2): 118–122. doi:10.1046/j.1365-2311.1998.00115.x. ISSN   1365-2311. S2CID   86589135.
  12. ↑ Boots, M. "Kinship and cannibalism in the Indian meal moth, Plodia interpunctella: No evidence of kin discrimination". Evolutionary Ecology Research. 2: 119–128.
  13. 1 2 Cowan, Thomas; Gries, Gerhard (1 May 2009). "Ultraviolet and violet light: attractive orientation cues for the Indian meal moth, Plodia interpunctella". Entomologia Experimentalis et Applicata. 131 (2): 148–158. doi:10.1111/j.1570-7458.2009.00838.x. ISSN   1570-7458. S2CID   86272635.
  14. ↑ Frederick), Chapman, R. F. (Reginald (1998). The insects : structure and function (4th ed.). Cambridge, UK: Cambridge University Press. ISBN   978-0521570480. OCLC   37682660.{{cite book}}: CS1 maint: multiple names: authors list (link)
  15. ↑ Tzanakakis, M. E. (1 November 1959). "An ecological study of the Indian-meal moth Plodia interpunctella (Hübner) with emphasis on diapause". Hilgardia. 29 (5): 205–246. doi: 10.3733/hilg.v29n05p205 . ISSN   0073-2230.
  16. ↑ "Biological Control of Stored-Product Pests" Archived 15 June 2010 at the Wayback Machine Midwest Biological Control News (University of Wisconsin)
  17. ↑ Sait, Begon (July 1994). "The Effects of a Sublethal Baculovirus Infection in the Indian Meal Moth, Plodia interpunctella". Journal of Animal Ecology. 63 (3): 541–550. doi:10.2307/5220. JSTOR   5220.
  18. ↑ Boots, M.; Begon, M. (1993). "Trade-Offs with Resistance to a Granulosis Virus in the Indian Meal Moth, Examined by a Laboratory Evolution Experiment". Functional Ecology. 7 (5): 528–534. doi:10.2307/2390128. JSTOR   2390128.
  19. ↑ du Rand, Nicolette (July 2009). Isolation of Entomopathogenic Gram Positive Spore Forming Bacteria Effective Against Coleoptera (PhD thesis). Pietermaritzburg, South Africa: University of KwaZulu-Natal. hdl:10413/1235.[ page needed ]
  20. ↑ Cook, Penny A.; Gage, Matthew J. G. (1995). "Effects of Risks of Sperm Competition on the Numbers of Eupyrene and Apyrene Sperm Ejaculated by the Moth Plodia interpunctella (Lepidoptera: Pyralidae)". Behavioral Ecology and Sociobiology. 36 (4): 261–268. doi:10.1007/s002650050148. JSTOR   4601073.
  21. 1 2 Podoler, H. (1974). "Effects of Intraspecific Competition in the Indian Meal-Moth (Plodia interpunctella Hubner) (Lepidoptera: Phycitidae) on Populations of the Moth and its Parasite Nemeritis canescens (Gravenhorst) (Hymenoptera: Ichneumonidae)". Journal of Animal Ecology. 43 (3): 641–651. doi:10.2307/3528. JSTOR   3528.
  22. ↑ Zhu, Junwei; Rikard Unelius, C.; Ryne, Camilla; Valeur, Peter G.; Löfstedt, Christer (August 1999). "Reidentification of the female sex pheromone of the Indian meal moth, Plodia interpunctella: evidence for a four-component pheromone blend". Entomologia Experimentalis et Applicata. 92 (2): 137–146. doi:10.1046/j.1570-7458.1999.00533.x. S2CID   85345490.
  23. ↑ Grant, G. G.; Brady, U. E. (1 June 1975). "Courtship behavior of phycitid moths. I. Comparison of Plodia interpunctella and Cadra cautella and role of male scent glands". Canadian Journal of Zoology. 53 (6): 813–826. doi:10.1139/z75-095. ISSN   0008-4301.
  24. ↑ Ryne, Camilla; Zhu, Jun-Wei; Van Dongen, Stefan; Christer, Löfstedt (2001). "Spermatophore Size and Multiple Mating: Effects on Reproductive Success and Post-Mating Behaviour in the Indian Meal Moth". Behaviour. 138 (8): 947–963. doi:10.1163/156853901753286506.
  25. ↑ Cardé, Ring T.; Willis, Mark A. (1 July 2008). "Navigational Strategies Used by Insects to Find Distant, Wind-Borne Sources of Odor". Journal of Chemical Ecology. 34 (7): 854–866. doi:10.1007/s10886-008-9484-5. ISSN   0098-0331. PMID   18581182. S2CID   21604778.
  26. ↑ Deseő, K.V. (1 January 1976). "The Oviposition of the Indian Meal Moth (Plodia Interpunctella Hbn., Lep., Phyticidae) Influenced by Olfactory Stimuli and Antennectomy". The Host-Plant in Relation to Insect Behaviour and Reproduction. pp. 61–65. doi:10.1007/978-1-4613-4274-8_8. ISBN   978-1-4613-4276-2.
  27. 1 2 Grant, G. G.; Smithwick, E. B.; Brady, U. E. (1 June 1975). "Courtship behavior of phycitid moths. II. Behavioral and pheromonal isolation of Plodia interpunctella and Cadra cautella in the laboratory". Canadian Journal of Zoology. 53 (6): 827–832. doi:10.1139/z75-096. ISSN   0008-4301.
  28. ↑ Grabe, Albert (1942): Eigenartige Geschmacksrichtungen bei Kleinschmetterlingsraupen ["Strange tastes among micromoth caterpillars"]. Zeitschrift des Wiener Entomologen-Vereins27: 105–109 [in German]. PDF fulltext
  29. ↑ "How to Get Rid of Pantry Moths". Learn to Get Rid Of... 19 February 2015. Archived from the original on 27 March 2015. Retrieved 27 March 2015.
  30. ↑ Klass, Carolyn (2009) Pesticide Management Education Program – Indian Meal Moth. Version of February 2009.
  31. ↑ Cranshaw, Whitney (2011): Indian Meal Moth Archived 27 February 2012 at the Wayback Machine . Colorado State University Extension. Version 4/03. Reviewed 3/08.
  32. ↑ Phillips, Tom (1995) Biological Control of Stored-Product Pests Archived 15 June 2010 at the Wayback Machine . Midwest Biological Control News Online2(10).
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