Acronicta rumicis

Last updated

Acronicta rumicis
Acronicta.rumicis.jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Superfamily: Noctuoidea
Family: Noctuidae
Genus: Acronicta
Species:
A. rumicis
Binomial name
Acronicta rumicis

Acronicta rumicis, the knot grass moth, is a species of moth which is part of the genus Acronicta and family Noctuidae. It was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae. It is found in the Palearctic region. A. rumicis lives and feeds on plants located in wide-open areas. At its larval stage, as a caterpillar, it causes such a large impact as a crop pest that it has received much attention and research. A. rumicis feeds on maize, strawberries and other herbaceous plants.

Contents

The moth's evolution has been affected by the industrial melanism that occurred in Europe during the late 19th and early 20th centuries, causing a dramatic increase in two aberrations (salicin and lugubris), which have darker grey wings. Today, A. rumicis is important to conservation efforts in the United Kingdom, because, like many other species, it is in decline. However, as it is part of a UK Priority Biodiversity Action Plan and receiving greater awareness and conservation, the species may become more abundant.

Description and identification

A. rumicis has a wingspan of 34–44 mm. The forewings are blotched with a mixture of dark and light-grey shades, while the hindwings are dark brown. [1] A white spot is seen midway down the trailing edge of the forewing providing a distinct marker for A. rumicis not seen in other Acronicta moths. Chinese and Japanese moths tend to be larger than their European counterparts. The Asian moths also have lower forewings that have darker shades of grey.

Technical description and variation

C. rumicis L. (3i). Forewing dark grey, varied in places with whitish; lines and shades black; outer line marked by a white spot on the submedian fold ; hindwings brownish fuscous Larva marbled dark and light grey: a dorsal row of red spots on black blotches, and a row of white spots on each side; a pale line below spiracles, containing orange-red tubercles; segments 5 and 12 of dorsum humped; tubercles with fascicles of fuscous and fulvous hairs— turanica Stgr., a form from Central Asia, is much paler, with the hindwings whitish. — Chinese and Japanese examples (3k) are larger than European and in all cases darker; in particular the lower half of forewing is blacker and the white spot of outer line then often obscured ; possibly the scotch form figured by Curtis as salicis, a melanic form, may represent this aberration, though the larva figured as belonging thereto is unquestionably that of menyanthidis. — ab. alnoides Geest (3k) has the costal half of forewing grey, the inner half blackish, somewhat interrupted with a strong black dagger-shaped mark at base and above anal angle ; superficially resembles a dark grey alni ; recorded from Freiburg in Baden. — ab. euphorbiae Steph. nec. Hbn. is grey brown, with the stigmata and space between them pale; and ab. euphrasiae Steph. nec Dup. is pale yellowish grey with numerous black lines and the orbicular stigma faint or obsolete, occurring in Cornwall. [2]


Taxonomy and phylogenetics

A. rumicis is a moth of the genus Acronicta and family Noctuidae. Noctuidae has upwards of 21,000 species. Noctuids are commonly known as "owlet moths" because of their large eyes that shine in the dark and the colour of their wings which make them difficult to see. [3] In their usual resting position, noctuids fold their wings back over their bodies; the forewings overlap one another. The closed wings form a tent-like shape. [4] Almost all Acronicta larvae are brightly coloured with spiky brown hairs all along the dorsal side of the body. [5] According to Thomas Algernon Chapman, the genus Acronicta can be split into three major groups: The first, characterized by a hoop-like structure of the pupa and clumped oviposition, includes: A. auricoma , A. myricae , A. menthanthidis , A. venosa , and A. rumicis . The second, characterized by terminal spines of pupa and dome-shaped ova laid apart from others, includes: A. psi , A. tridens , A. strigosa , A. alni , A. megacephala , A. leporina , A. aceris . The third group has only one species, A. ligustri .

Palearctic region Palearctic.png
Palearctic region

Distribution and habitat

A. rumicis is distributed throughout the Palearctic. It is common in northwestern China, the Korean Peninsula, and Japan, although it has also been found in other parts of Eurasia, including Russia. [6] A. rumicis is found in almost all parts of Europe, though it is absent in some areas of north-western Scandinavia. There has been much research about the species in England and Scotland. [1]

These moths tend to spend their lives in plants located in wide-open areas like meadows, woodland clearings, gardens, and hedgerows, generally in non-humid areas. [7]

Food resources

Rumex obtusifolius, or broad-leaved dock Rumex obtusifolius 001.JPG
Rumex obtusifolius , or broad-leaved dock

Caterpillars

At the caterpillar stage, A. rumicis tends to feed on low-growing, herbaceous plants, including sorrel, dock, bramble, thistles, hop, [8] and occasionally on the leaves of shrubs. [7] In addition, A. rumicis larvae favour fruit trees like Prunus species and plants of the family Polygonaceae. [9]

In research, one of the most commonly used host plants is Rumex obtusifolius , a herbaceous plant commonly found within A. rumicis's range. [9]

Parental care

Oviposition

Drawing of A. rumicis egg shape Eggshapeofarumicis.jpg
Drawing of A. rumicis egg shape

Females tend to lay eggs on leaves of host plants in large clusters. These clusters are arranged in long longitudinal ridges, which originate and spread out on the leaf from the micropylar (ovular) area of the plant. The longest ridges tend to be in a zigzag formation. [10] The eggs have a flattened shape, making clustering and clumping easier.

Life history

A. rumicis species generally have two broods: the first generation flies in May and June, while the second flies in August and September. However, the number of generations can differ based on location; in southern Europe, it tends to have three broods, while in the north, it has only one, most likely due to diapause. [1] The number of broods may be determined by the duration of light and temperature ranges. The larvae tend to feed from the summer onwards until winter, during which A. rumicis spend its time in the pupae stage in cocoons. [1]

Caterpillar Acronicta rumicis - caterpillar (2006-10-10).jpg
Caterpillar

Egg

Eggs are laid in clusters, in almost regular, overlapping rows on host plants. The egg stage lasts about 5 to 10 days. The eggs have a round flattened shape like a sand dollar and has a micropylar area that has 20 long ridges that radiate from the center, almost like a child's drawing of a sun and its rays. [10] The flattened structure allows for stability while resting on the host plant. [10]

Caterpillar

When larvae hatch, they tend to nibble out the round opening of the egg. Usually, A. rumicis larvae are ready to pupate after 30 days. They tend to be about 40 mm long, having dark brown bodies, with white spots along both sides of the body and red spots along the centre of the back. [11] Body hairs grow in tufts, arranged in rows: two rows along each side of the body and one row along the centre of the back. [1]

Cocoon Acronicta rumicis cocon1.jpg
Cocoon

Pupa

Once the winter months near, fully grown caterpillars pupate in cocoons on leaves or leaf litter. The cocoon has tough white silk with one simple layer of grass, twigs, or leaves for better concealment from predators. [5]

Adult

Adult moths tend to emerge in June but can also appear in earlier months if the weather is consistently warm.

Enemies

Predators

Although the general cause of trouble in the life of A. rumicis is parasitism via parasitoids, another group of predators includes small birds. These birds, like the great spotted woodpecker, tend to breed and nest in agricultural regions. In one study from Slovenia, the birds were nested in a hop field. Hop is a popular food resource for A. rumicis, while caterpillars are the primary food source for these birds. [12]

Parasites

Parasitism in A. rumicis generally occurs in the months of May and October. Rates are lower in the months of June and July for reasons yet unknown. Most parasitoids affecting A. rumicis are parasitic wasps in the Braconidae and Ichneumonidae families, as well as parasitic flies. [13]

One of the most common parasitoids of A. rumicis is Glyptapanteles liparidis , a larval parasitoid that is highly distributed throughout Eurasia. [14] G. liparidis oviposits on the surface of the moth larvae; once hatched, the wasp larvae feed on the A. rumicis larvae and eventually cause death.

Based on one study in South Korea, G. liparidis affects A. rumicis in its first, second, third, and fourth instar. [14] The same study also discovered that the second-instar larvae were apparently the best food source for this parasitoid, as the second-instar larvae had the highest mortality rate in comparison to the other three larval stages. As the G. liparidis continuously grows and utilizes the resources produced internally by A. rumicis larvae, the feeding habits of these larvae change as well. On average, parasitized larvae consume more plant material than those not parasitized; the second instar larvae tend to consume the most food in comparison to the first, third, and fourth instars, supporting the idea that most G. liparidis feed most efficiently on the second instar larvae of A. rumicis. [14]

Genetics of colour patterns

Pigmentation and structural colouration

Industrial melanism exists within the species, meaning the moths evolved during the industrial period in England when dark soot was deposited into the environment. The aberration salicis Curtis, which is commonly found throughout the moth's distribution range, has darker grey-blotched sections on wings and retains the A. rumicis identifying marker, the white spot on its forewings. [15] Aberration salicis is commonly found distributed in England, Wales, and Ireland.

The aberration lugubris Schultz is almost completely black, lacking the mixed-grey mottling on the wings, but still retains the prominent white spot marker on its forewings. [16] Aberration lugubris can be found mainly in England. According to B.K. West, since the late 1990s, melanism in A. rumicis has become less and less prevalent; in 1995, about 20% of A. rumicis were observed to be melanic, but over the course of five years the percentage decreased to 6.1%. By 2004, only 2.8% of population were melanic. [16] With the industrial period in the past and resting surfaces less darkened by soot, it is reasonable to see that evolutionarily, the melanic variations are no longer as favourable.

Physiology

Diapause

In A. rumicis, duration of light and temperature are two major factors causing diapause, the slowing or stopping of development in an insect when environmental conditions are not optimal. In one study, the onset of diapause was observed after varying photoperiods, while constantly rearing A. rumicis larvae at 27-28 °C. When A. rumicis were exposed to light on a short day, or 6–15 hours in the experiment, during the larval feeding period, almost all individuals underwent diapause after reaching pupal stage. [17] As the daily photoperiods extended past 17 hours, the incidence of diapause began to drop, not causing any change to the development of the pupae in the cocoon. [17]

The ability of A. rumicis to undergo diapause allows for the completion of two generations while its host plants are available. [18] The first generation develops under longer photoperiods, therefore the pupae are physiologically active, while the second generation grow under shorter photoperiods, meaning it is more beneficial for pupae to form diapause as they overwinter through the cold. [18]

Interactions with humans

Pests of crop plants

A. rumicis is a minor pest of various of fruit plants, mostly strawberries. However, they can also cause damage to blackberry, raspberry, loganberry, apple, pear, and cherry. Usually the larvae cause defoliation as they feed on the newly grown leaves. [1] A. rumicis also attacks beans, ground nuts, wheat, maize, brassicas, and others. [19]

According to a study in Poland, A. rumicis has also taken over maize populations, feeding until the leaves of the corn plants are no longer fresh and new because of the shift into harvesting season. During the spring and summer, the larvae of these moths damages both the leaves and silks of the cobs, occasionally eating soft kernels as well. When the second brood came in the fall, they only ate the leaves. This study in Poland further supports that A. rumicis larva prefer to eat fresh and newly grown leaves. [20]

Conservation

Overall, the population of A. rumicis is in a sharp decline. Focusing on the moths in the United Kingdom, current research suggests that moths are in danger due to habitat loss, poor habitat management, global warming, and environmental deterioration from pesticides and pollution. [21] Since 1969, the population of A. rumicis has declined by nearly 75%. Recently, A. rumicis was assigned as a Priority Biodiversity Action Plan (BAP) species, meaning the moth was identified as most threatened and will immediately be part of conservation efforts. [22]

Researchers are realizing that the conservation of woodland areas is a high priority, in order to sustain as many populations of BAP species as possible; they also found a positive correlation between the species richness of herbaceous plants and the population density of moths. [21]

Habitat loss and migration issues

hedgerows Hedgerow at Chilswell - geograph.org.uk - 1421602.jpg
hedgerows

According to Emma Coulthard, hedgerows in close proximity to crop plants and farmlands are highly important to the survival of moths like A. rumicis. Habitats like hedgerows tend to provide food resources, shelter, and a place for females to lay eggs. In addition, recent studies have shown that hedgerows may act as guides for moths when flying from one location to another. As moths are nocturnal, it is highly unlikely that they use visual aids as guides, but rather are following olfactory markers. [21]

However, recently, hedgerows have been removed to increase agricultural efficiency. Removing key habitats like hedgerows not only limits the basic necessities of survival (i.e. food, shelter), but also prevents the moth from navigating properly; eventually, the moth would lose its trail and then potentially die. [21] Even the smallest gaps between two bunches of hedgerows can cause a moth to go astray; one metre of no hedgerow can make an impact. [21] Therefore, it is crucial for agriculturalists to figure out a way to pursue their plans while conserving the homes of moths like A. rumicis.

Related Research Articles

<span class="mw-page-title-main">Luna moth</span> Species of insect

The Luna moth also known as the American moon moth is a Nearctic moth in the family Saturniidae, subfamily Saturniinae, a group commonly known as giant silk moths. It has lime-green colored wings and a white body. The larvae (caterpillars) are also green. Typically, it has a wingspan of roughly 114 mm (4.5 in), but can exceed 178 mm (7.0 in), making it one of the larger moths in North America. Across Canada, it has one generation per year, with the winged adults appearing in late May or early June, whereas farther south it will have two or even three generations per year, the first appearance as early as March in southern parts of the United States.

<i>Helicoverpa zea</i> Species of moth

Helicoverpa zea, commonly known as the corn earworm, is a species in the family Noctuidae. The larva of the moth Helicoverpa zea is a major agricultural pest. Since it is polyphagous during the larval stage, the species has been given many different common names, including the cotton bollworm and the tomato fruitworm. It also consumes a wide variety of other crops.

<span class="mw-page-title-main">Scalloped oak</span> Species of moth

The scalloped oak is a moth of the family Geometridae. The species was first described by Carl Linnaeus in his 1758 10th edition of Systema Naturae.

<span class="mw-page-title-main">Cabbage moth</span> Species of moth

The cabbage moth is primarily known as a pest that is responsible for severe crop damage of a wide variety of plant species. The common name, cabbage moth, is a misnomer as the species feeds on many fruits, vegetables, and crops in the genus Brassica. Other notable host plants include tobacco, sunflower, and tomato, making this pest species particularly economically damaging.

<i>Manduca quinquemaculata</i> Species of moth

Manduca quinquemaculata, the five-spotted hawkmoth, is a brown and gray hawk moth of the family Sphingidae. The caterpillar, often referred to as the tomato hornworm, can be a major pest in gardens; they get their name from a dark projection on their posterior end and their use of tomatoes as host plants. Tomato hornworms are closely related to the tobacco hornworm Manduca sexta. This confusion arises because caterpillars of both species have similar morphologies and feed on the foliage of various plants from the family Solanaceae, so either species can be found on tobacco or tomato leaves. Because of this, the plant on which the caterpillar is found does not indicate its species.

<i>Agrotis ipsilon</i> Species of moth

Agrotis ipsilon, the dark sword-grass, black cutworm, greasy cutworm, floodplain cutworm or ipsilon dart, is a small noctuid moth found worldwide. The moth gets its scientific name from black markings on its forewings shaped like the letter "Y" or the Greek letter upsilon. The larvae are known as "cutworms" because they cut plants and other crops. The larvae are serious agricultural pests and feed on nearly all varieties of vegetables and many important grains.

<i>Spodoptera littoralis</i> Species of moth

Spodoptera littoralis, also referred to as the African cotton leafworm or Egyptian cotton leafworm or Mediterranean brocade, is a species of moth in the family Noctuidae. S. littoralis is found widely in Africa, Mediterranean Europe and Middle Eastern countries. It is a highly polyphagous organism that is a pest of many cultivated plants and crops. As a result, this species was assigned the label of A2 quarantine pest by the EPPO and was cautioned as a highly invasive species in the United States. The devastating impacts caused by these pests have led to the development of both biological and chemical control methods. This moth is often confused with Spodoptera litura.

<i>Achaea janata</i> Species of moth

Achaea janata, the castor semi-looper or croton caterpillar, is an erebid moth, the caterpillars of which are termed 'semi-loopers' due to their mode of locomotion. It is found from the Indo-Australian tropics and subtropics, extending south to New Zealand and east through the Pacific archipelagoes to Easter Island. It is a major pest of castor throughout the world.

<i>Glyptapanteles</i> Genus of wasps

Glyptapanteles is a genus of endoparasitoid wasps found in Central and North America and New Zealand. The larvae of the members of Glyptapanteles sp. are distinguished by their ability to manipulate their hosts into serving as bodyguards.

<i>Acronicta euphorbiae</i> Species of moth

Acronicta euphorbiae, the sweet gale moth, is a moth of the family Noctuidae. The species was first described by Michael Denis and Ignaz Schiffermüller in 1775.

<i>Mythimna unipuncta</i> Species of moth

Mythimna unipuncta, the true armyworm moth, white-speck moth, common armyworm or rice armyworm, is a nocturnal agricultural pest belonging to the family Noctuidae. This moth is also commonly referred to by the scientific name Pseudaletia unipuncta. The species was first described by Adrian Hardy Haworth in 1809. Mythimna unipuncta is found in the Americas and in parts of Europe, Africa and Asia. Its original distribution is North and South America. It has been introduced to other places from there. They are known as armyworms because the caterpillars move in lines as a massive group, like an army, from field to field, damaging crops.

<i>Eriogaster lanestris</i> Species of moth

Eriogaster lanestris, commonly known as the small eggar, is a moth of the family Lasiocampidae that is found across the Palearctic. Unlike many other members of the Lasiocampidae, the small eggar is a social insect. Historically, only eusocial insects like ants, bees, and termites were thought to exhibit complex social organization and communication systems. However, research since the late 20th century has found that E. lanestris, among a number of other phylogenetically related moth and butterfly species, demonstrates social behaviors as well. Larvae spend nearly their entire development in colonies of about 200 individuals, and this grouped social structure offers a number of benefits, from thermoregulation to increased foraging success.

<i>Helicoverpa punctigera</i> Species of moth

Helicoverpa punctigera, the native budworm, Australian bollworm or Chloridea marmada, is a species of moth in the family Noctuidae. This species is native to Australia. H. punctigera are capable of long distance migration from their inland Australian habitat towards coastal regions and are an occasional migrant to New Zealand.

<i>Chloridea virescens</i> Species of moth

Chloridea virescens, commonly known as the tobacco budworm, is a moth of the family Noctuidae found throughout the eastern and southwestern United States along with parts of Central America and South America.

<i>Spodoptera eridania</i> Species of moth

Spodoptera eridania is a moth that is known to be a pest. They are one of the most important defoliators in the tropical and subtropical regions of the western hemisphere that feed heavily on plants while they are young, often resulting in skeleton leaves on their food plants. They are also heavy feeders on tomato in Florida. There is a lot of development in producing pesticides against the S. eridania, specifically a neem-based pesticide that can result in smaller and prolonged development. The wingspan is 33–38 mm. Adults are on wing year-round. The larvae feed on various weeds but prefer Amaranthus species and Phytolacca americana.

<i>Arsenura armida</i> Species of moth

Arsenura armida, the giant silk moth, is a moth of the family Saturniidae. It is found mainly in South and Central America, from Mexico to Bolivia, and Ecuador to south-eastern Brazil. It was first described by Pieter Cramer in 1779.

<i>Gynaephora groenlandica</i> Species of moth

Gynaephora groenlandica, the Arctic woolly bear moth, is an erebid moth native to the High Arctic in the Canadian archipelago, Greenland and Wrangel Island in Russia. It is known for its slow rate of development, as its full caterpillar life cycle may extend up to 7 years, with moulting occurring each spring. This species remains in a larval state for the vast majority of its life. Rare among Lepidoptera, it undergoes an annual period of diapause that lasts for much of the calendar year, as G. groenlandica is subject to some of the longest, most extreme winters on Earth. In this dormant state, it can withstand temperatures as low as −70 °C. The Arctic woolly bear moth also exhibits basking behavior, which aids in temperature regulation and digestion and affects both metabolism and oxygen consumption. Females generally do not fly, while males usually do.

<i>Samea multiplicalis</i> Species of moth

Samea multiplicalis, the salvinia stem-borer moth, is an aquatic moth commonly found in freshwater habitats from the southern United States to Argentina, as well as in Australia where it was introduced in 1981. Salvinia stem-borer moths lay their eggs on water plants like Azolla caroliniana, Pistia stratiotes, and Salvinia rotundifolia. Larval feeding on host plants causes plant death, which makes S. multiplicalis a good candidate for biological control of weedy water plants like Salvinia molesta, an invasive water fern in Australia. However, high rates of parasitism in the moth compromise its ability to effectively control water weeds. S. multiplicalis larvae are a pale yellow to green color, and adults develop tan coloration with darker patterning. The lifespan, from egg to the end of adulthood is typically three to four weeks. The species was first described by Achille Guenée in 1854.

<i>Hemileuca lucina</i> Species of moth

Hemileuca lucina, the New England buck moth, is a species of moth in the family Saturniidae. This moth species is only found in the New England region of the United States. Larvae in early stages mainly feed on broadleaf meadowsweet whereas larvae in later stages show variation in food sources such as blackberry and black cherry leaves. Larvae have a black body with orange/black spines on their back that are used to deter predators. Pupation occurs during the summer and adult moths come out around September.

<i>Chlumetia transversa</i> Species of moth

Chlumetia transversa, the mango shoot borer, is a moth of the family Euteliidae. The species was first described by Francis Walker in 1863. It is a widely distributed across Indo-Australian tropical countries far east to Solomon Islands.

References

  1. 1 2 3 4 5 6 Alford, D. V., 2014. Pests of Fruit Crops: A Colour Handbook. p.356.
  2. Warren. W. in Seitz, A. Ed., 1914 Die Großschmetterlinge der Erde, Verlag Alfred Kernen, Stuttgart Band 3: Abt. 1, Die Großschmetterlinge des palaearktischen Faunengebietes, Die palaearktischen eulenartigen Nachtfalter, 1914PD-icon.svg This article incorporates text from this source, which is in the public domain .
  3. Singh, H., 2014. Taxonomic Studies on Family Noctuidae (Lepidoptera) from North-East India.
  4. Waring, Paul, et al. Field Guide to the Moths of Great Britain and Ireland. British Wildlife, 2009.
  5. 1 2 Chapman, T.A., 1890. The Genus Acronycta and its Allies. The Entomologist's Record and Journal of Variation, 1(April), pp.1–4, 26–28.
  6. Anon, 1901. Transactions of the Entomological Society of London.
  7. 1 2 Winiarska, G., 1990. Communities of noctuids (Lepidoptera, Noctuidae) of linden-oak-hornbeam forests of the Mazovian Lowland. Fragmenta Faunistica, 15(11), pp.143–163.
  8. Skinner, B., 2009. Colour Identification Guide to Moths of the British Isles: (Macrolepidoptera). p.149.
  9. 1 2 Cho, Y., Kwon, O. & Nam, S.-H., 2006. Ecological and morphological characteristics of the endoparasitoids of larval Acronicta rumicis (Lepidoptera: Noctuidae). Entomological Research, 36, pp. 208–215.
  10. 1 2 3 Dolinskaya, I. V., 2014. Egg Morphology of some Noctuidae (Lepidoptera). Vestnik Zoologii, 48(4), pp. 353–364.
  11. Anon, 2010. The Knot Grass moth and caterpillar – Acronicta rumicis. Wildlife Insight.
  12. Vogrin, M., 2002. Breeding birds in hop fields. Ornis Svecica, 12, pp.92–94.
  13. Cho, Y.-H., Kwon, O.-S. & Nam, S.-H., 2006. Species Composition and Seasonal Distribution of the Endoparasitoids on Acronicta rumicis (Lepidoptera, Noctuidae). Journal of Ecology and Environment, 29(1), pp.55–60.
  14. 1 2 3 CHO, Y.-H., NAM, S.-H. & KWON, O., 2006. Interaction of Acronicta rumicis (Lepidoptera: Noctuidae) and its larval parasitoid, Glyptapanteles liparidis (Hymenoptera: Ichneumonidae). Entomological Research, 36, pp. 79–84.
  15. Skinner, B., 2009. Colour Identification Guide to Moths of the British Isles: (Macrolepidoptera). , p. 149.
  16. 1 2 West, B.K., 2005. Acronicta rumicis L. ( Lep.: Noctuidae) extreme melanic ab. lugubris Schultz in Kent, and continued decline in melanism. Entomologist's Record and Journal of Variation, 2005(4), pp. 174–175.
  17. 1 2 Lee, A.D., 1955. The Physiology of Diapause in Arthropods 4th ed., Cambridge Monographs in Experimental Biology.
  18. 1 2 Saulich, A.K., Sokolova, I. V & Musolin, D.L., 2015. Seasonal development of the dark spectacle Abrostola triplasia (L.) (Lepidoptera, Noctuidae) and its environmental control. Entomological Review, 95(6), pp. 687–692.
  19. Hu, M. & Qi, M.L., 1993. The morphology and behaviour of Acronicta rumicis L., Ke xue chu ban she.
  20. Bereś, P.K., 2009. Knot grass (Acronicta rumicis L.) - a new maize pest in Southeastern Poland, Institute of Plant Protection. [Accessed October 23, 2017].
  21. 1 2 3 4 5 Coulthard, E., 2015. Habitat and landscape-scale effects on the abundance and diversity of macromoths (Lepidoptera) in intensive farmland. The University of Northampton.
  22. Anon, 2016. UK BAP priority species. Joint Nature Conservation Committee.