Mythimna separata

Last updated

Oriental armyworm
Mythimna separata.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Superfamily: Noctuoidea
Family: Noctuidae
Genus: Mythimna
Species:
M. separata
Binomial name
Mythimna separata
Walker, 1865
Synonyms
  • Leucania separata
  • Mythimna (Pseudaletia) separate
  • Leucania consimilis
  • Aletia unipuncta

Mythimna separata, the northern armyworm, oriental armyworm or rice ear-cutting caterpillar, is a moth of the family Noctuidae. It is found in China, Japan, South-east Asia, India, eastern Australia, New Zealand, and some Pacific islands. It is one of the major pests of maize in Asia. [1] The species was first described by Francis Walker in 1865.

Contents

Etymology

They term "armyworm" is used because of their habit to spread out in a line across a lawn or pasture, and slowly "march" forward, consuming the foliage they encounter.

Caterpillar Mythimna separata (catepiller).jpg
Caterpillar
Plant volatiles released by corn plants may help the caterpillar avoid predators. Mythimna separata.png
Plant volatiles released by corn plants may help the caterpillar avoid predators.

Description

The wingspan is 35–50 mm. Males lack paired tufts on the basal segment of the abdomen below. [2] The forewings are greyish yellow with a dark-grey or reddish-yellow tinge. The round and reniform spots are light or yellowish with indistinct edges, whereas reniform spot with white point at lower margin. External wing margin blackened obliquely from top backward, with dark stroke and with a row of dark points. Hindwings are grey, with dark external margin. Antennae thread like. Eggs are spherical and milky white with a thinly reticulate surface. Larvae usually have six instars, rarely seven. It reaching 40 mm in length at its last instar. Larva has two wide black-brown and one intermediate light dorsal stripe, with black-brown lateral stripe along spiracle line. spiracles brown with black rim. Pupae are yellowish brown and shiny. [3]

Ecology

The moth flies from January to April depending on the location. The larvae feed on a range of agricultural plants like Zea mays , Sorghum bicolor and Oryza sativa and are thus considered a pest. [4] Caterpillars do not feed on Momordica charantia due to the presence of the triterpenoid glucoside called momordicine II, which is a natural inhibitor of caterpillar actions. [5]

Infestations

China experiences periodic outbreaks of northern armyworm infestation. [6] The outbreak in 2012 was particularly severe. [7]

Control

Larva can be hand picked and adults can attracted using pheromones. Regulation of water level in the fields, and removal of alternate hosts from the field are also effective. Among biological controls, ducks are good; they can locate larvae hiding in the soil or at the base of plants easily and prey on them. Introduction of Cotesia ruficrus , and Eupteromalus parnarae also parasitized the larva. Selective pesticides and weedicides can also be used in the field. Integrated pest management methods undertaken by governments. [8]

See also

Related Research Articles

<span class="mw-page-title-main">Noctuidae</span> Type of moths commonly known as owlet moths, cutworms or armyworms

The Noctuidae, commonly known as owlet moths, cutworms or armyworms, are a family of moths. They are considered the most controversial family in the superfamily Noctuoidea because many of the clades are constantly changing, along with the other families of the Noctuoidea. It was considered the largest family in Lepidoptera for a long time, but after regrouping Lymantriinae, Catocalinae and Calpinae within the family Erebidae, the latter holds this title now. Currently, Noctuidae is the second largest family in Noctuoidea, with about 1,089 genera and 11,772 species. This classification is still contingent, as more changes continue to appear between Noctuidae and Erebidae.

<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.

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

The beet armyworm or small mottled willow moth is one of the best-known agricultural pest insects. It is also known as the asparagus fern caterpillar. It is native to Asia, but has been introduced worldwide and is now found almost anywhere its many host crops are grown. The voracious larvae are the main culprits. In the British Isles, where it is an introduced species and not known to breed, the adult moth is known as the small mottled willow moth.

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

The African armyworm, also called okalombo, kommandowurm, or nutgrass armyworm, is a species of moth of the family Noctuidae. The larvae often exhibit marching behavior when traveling to feeding sites, leading to the common name "armyworm". The caterpillars exhibit density-dependent polyphenism where larvae raised in isolation are green, while those raised in groups are black. These phases are termed solitaria and gregaria, respectively. Gregaria caterpillars are considered very deleterious pests, capable of destroying entire crops in a matter of weeks. The larvae feed on all types of grasses, early stages of cereal crops, sugarcane, and occasionally on coconut. The solitaria caterpillars are less active and undergo much slower development. The species is commonly found in Africa, but can also be seen in Yemen, some Pacific islands, and parts of Australia. African armyworm outbreaks tend to be devastating for farmland and pasture in these areas, with the highest-density outbreaks occurring during the rainy season after periods of prolonged drought. During the long dry seasons ("off-season"), the population densities are very low and no outbreaks are seen.

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

Helicoverpa armigera is a species of Lepidoptera in the family Noctuidae. It is known as the cotton bollworm, corn earworm, Old World (African) bollworm, or scarce bordered straw. The larvae feed on a wide range of plants, including many important cultivated crops. It is a major pest in cotton and one of the most polyphagous and cosmopolitan pest species. It should not be confused with the similarly named larva of the related species Helicoverpa zea.

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

Spodoptera litura, otherwise known as the tobacco cutworm or cotton leafworm, is a nocturnal moth in the family Noctuidae. S. litura is a serious polyphagous pest in Asia, Oceania, and the Indian subcontinent that was first described by Johan Christian Fabricius in 1775. Its common names reference two of the most frequent host plants of the moth. In total, 87 species of host plants that are infested by S. litura are of economic importance. The species parasitize the plants through the larvae vigorous eating patterns, oftentimes leaving the leaves completely destroyed. The moth's effects are quite disastrous, destroying economically important agricultural crops and decreasing yield in some plants completely. Their potential impact on the many different cultivated crops, and subsequently the local agricultural economy, has led to serious efforts to control the pests.

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

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.

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

Mythimna unipuncta, the true armyworm moth, white-speck moth, common armyworm, or rice armyworm, is a species of moth in the family Noctuidae. The species was first described by Adrian Hardy Haworth in 1809. Mythimna unipuncta occurs in most of North America south of the Arctic, as well as parts of South America, Europe, Africa, and Asia. Although thought to be Neotropical in origin, it has been introduced elsewhere, and is often regarded as an agricultural pest. They are known as armyworms because the caterpillars move in lines as a massive group, like an army, from field to field, damaging crops.

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

The zebra caterpillar is the larva of an American noctuid moth that feeds on cabbages, beets and other cultivated plants.

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

Mythimna conigera, the brown-line bright-eye, is a moth of the family Noctuidae.

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

The fall armyworm is a species in the order Lepidoptera and one of the species of the fall armyworm moths distinguished by their larval life stage. The term "armyworm" can refer to several species, often describing the large-scale invasive behavior of the species' larval stage. It is regarded as a pest and can damage and destroy a wide variety of crops, which causes large economic damage. Its scientific name derives from frugiperda, which is Latin for lost fruit, named because of the species' ability to destroy crops. Because of its propensity for destruction, the fall armyworm's habits and possibilities for crop protection have been studied in depth. It is also a notable case for studying sympatric speciation, as it appears to be diverging into two species currently. Another remarkable trait of the larva is that they consistently practice cannibalism, despite its fitness costs.

<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>Leucania loreyi</i> Species of moth

Leucania loreyi, the cosmopolitan, false army worm or nightfeeding rice armyworm, is a moth of the family Noctuidae. It is found in most of African countries, the Indo-Australian subtropics and tropics of India, Sri Lanka, Myanmar, the eastern Palearctic realm, and the Near East and Middle East. The species was first described by Philogène Auguste Joseph Duponchel in 1827.

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

Spodoptera mauritia, the lawn armyworm or paddy swarming caterpillar, is a moth of the family Noctuidae. The species was first described by Jean Baptiste Boisduval in 1833. Able to eat many types of food, it is a major pest throughout the world.

<i>Penicillaria jocosatrix</i> Species of moth

Penicillaria jocosatrix, the mango shoot borer, is a moth of the family Euteliidae first described by Achille Guenée in 1852. It is found from southeast Asia to the Pacific. Records include Borneo, Guam, Hawaii, India, Sri Lanka, Thailand and in Australia, Western Australia, the Northern Territory and Queensland.

<i>Tiracola plagiata</i> Species of moth

Tiracola plagiata, the cacao armyworm, is a moth of the family Noctuidae. The species was first described by Francis Walker in 1857. It is found from south-east Asia, South India, Sri Lanka, Myanmar to the South Pacific Islands, including the northern two-thirds of Australia.

<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.

Leucania venalba is a moth of the family Noctuidae first described by Frederic Moore in 1867. It is found in Indo-Australian tropics of India, Sri Lanka, to Fiji and New Caledonia.

<i>Leucania yu</i> Species of moth

Leucania yu is a moth of the family Noctuidae first described by Achille Guenée in 1852. It is found in Oriental tropics of India, Sri Lanka, the Andaman Islands, Hong Kong, Indonesia, the Philippines, Taiwan east to Australia, Fiji and Tonga.

References

  1. Thakur, J. N.; Rawat, U. S.; Pawar, A. D. (1987). "First Record of Armyworm, Mythimna separata (Haworth) as a serious pest of maize in Kullu (HP) India and recommendations for its integrated management". Tropical Pest Management. 33 (2): 173–175. doi:10.1080/09670878709371141.
  2. Hampson, G. F. (1896). The Fauna of British India, Including Ceylon and Burma. Vol. Moths Volume IV. Taylor and Francis via Biodiversity Heritage Library.
  3. "Pests-Oriental Armyworm". Interactive Agricultural Ecological Atlas of Russia and Neighboring Countries. Retrieved 4 August 2016.
  4. "Mythimna (Pseudaletia) separata (Walker)". ICAR-National Bureau of Agricultural Insect Resources. Retrieved 4 August 2016.
  5. Herbison-Evans, Don & Crossley, Stella (1 December 2012). "Mythimna separata (Walker, 1865) Oriental Armyworm". Australian Caterpillars and their Butterflies and Moths. Retrieved 23 July 2018.
  6. Wang GP, et al. The role of nectar plants in severe outbreaks of armyworm Mythimna separata (Lepidoptera: Noctuidae) in China Archived 2018-01-25 at the Wayback Machine . Bulletin of Entomological Research 2006 October 96 (5):445-55.
  7. Staff, ChinaDaily. 14 August 2012. "China warns of armyworm outbreak" Archived 2013-12-02 at the Wayback Machine
  8. "Paddy armyworm (Mythimna separata)". Plantwise Technical Factsheet. Retrieved 4 August 2016.