Agrotis ipsilon | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Lepidoptera |
Superfamily: | Noctuoidea |
Family: | Noctuidae |
Genus: | Agrotis |
Species: | A. ipsilon |
Binomial name | |
Agrotis ipsilon (Hufnagel, 1766) | |
Synonyms | |
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Agrotis ipsilon, the dark sword-grass, ipsilon dart, black cutworm, greasy cutworm or floodplain cutworm, is a small noctuid moth found worldwide. [2] The moth gets its scientific name from black markings on its forewings shaped like the letter "Y" or the Greek letter upsilon. [3] The larvae are known as "cutworms" because they cut plants and other crops. [4] The larvae are serious agricultural pests and feed on nearly all varieties of vegetables and many important grains. [5] [6]
This species is a seasonal migrant that travels north in the spring and south in the fall to escape extreme temperatures in the summer and winter. The migration patterns reflect how reproduction occurs in the spring and ceases in the fall. [2]
Females release sex pheromones to attract males for mating. Pheromone production and release in females and pheromone responsiveness in males is dependent on the juvenile hormone (JH) and pheromone biosynthesis activating neuropeptide (BPAN). [7] In the span of 2 months, the moth progresses through the life cycle stages egg, larvae, pupa, and adult. [5] Throughout this time period, this moth faces the risk of predation and parasitism, such as by Hexamermis arvalis or by the parasite Archytas cirphis. [5] [8]
38–48 millimetres (1.5–1.9 in). Antennae in male bipectinated. Forewings brown, reddish-tinged, mixed with pale greyish-ochreous, costa and sometimes median area suffused with dark fuscous; first and second lines edged with dark fuscous; spots outlined with black, reniform followed by a short black dash; subterminal line obscure, usually preceded in middle by two fine black marks. Hindwings whitish-grey or whitish, terminally suffused with fuscous. Larva ochreous brownish or bronzy-grey, sides sometimes greenish; dorsal, subdorsal, and spiracular lines faintly darker or lighter, usually darker-edged; head suffusedly brown-marked. [9]
Populations of this species have been found in southern Canada, 48 of the United States (and additionally Hawaii), Mexico, Central and South America, Australia, New Zealand, the Pacific Rim, North Africa, Europe, and Asia. [2] However, they are absent from some tropical regions and colder areas and are more widespread in the Northern than Southern Hemisphere.
This species is also known to migrate north in the spring and migrate south in the fall. [5]
Larvae feed on weeds such as bluegrass, curled dock, lambsquarters, yellow rocket, and redroot pigweed. They will often eat all the weeds available before moving to attacking crops. Favored crops include most vegetable plants, alfalfa, clover, cotton, rice, sorghum, strawberry, sugarbeet, tobacco, and occasionally grains and grasses. [5]
Adults feed on flower nectar. They are also attracted to deciduous trees and shrubs such as linden, wild plum, crabapple, and lilac. [5] They are a pollinator of fetterbush lyonia. [10]
Based on the types of debris on the ground, the black cutworm prefers to oviposit in areas with fencerow (pasture) debris rather than corn field debris, woodland floor debris, and bare soil. Fencerow debris includes dry grass debris, and this may be attractive for females to oviposit early in the spring before rapid vegetation growth occurs.
After this growth, though, the moths are drawn more to low, dense plants such as the curled dock and yellow rocket. These plants have multiple stems and many low-lying basal leaves. On most plant species, the cutworm prefers to oviposit on the leaves rather than the stem. [11]
In a given year, the number of generations differs based on location and weather conditions. In Canada, there are 1 or 2 generations, while in the United States, there are 2 to 4 per year. This species is abundant in warmer temperatures (such as Arkansas, US) during the late spring in May–June and early fall in September and October, while they are more abundant in cooler temperatures (such as New York, US) during the summer in June and July. One life cycle lasts between 35–60 days. [5]
The egg stage lasts 3 to 6 days. Females oviposit eggs in clusters on low-lying leaves. If such host plants are not available, the females will oviposit on dead plant material. However, they will not lay eggs on bare soil. Females can deposit eggs singly, or in groups of up to 1200 to 1900 eggs.
The nearly spherical eggs are initially white but turn brown with age. The surface of the egg possesses 35–40 ribs that radiate from one apex. [5]
The larval stage lasts 20–40 days. Over the span of 5 to 9 instars, the caterpillar body grows from 3.5 mm to a maximum of 55 mm. Larval development is optimized at a temperature of 27 degrees Celsius, and instars 1–5 are most successful at higher humidities. By the 4th instar, the larva becomes light sensitive and spends most of the daylight underground. The larvae are considered pests because they damage the plant tissue under the soil. The larvae are cannibalistic.
The larva can range in color from light gray or gray brown to black. The ventral side is usually lighter, and this species does not have a dorsal band. The entire body is covered with granules and the head possesses many dark spots. [5]
The pupal stage lasts 12–20 days. This species pupates under the soil approximately 3–12 mm below the surface.
The pupae appear to be dark brown and are 17–12 mm long and 5–6 mm wide. [5]
One complete generation from egg to adult lasts 35–60 days. The female preoviposition period lasts 7–10 days.
Adults have a wingspan of 40–55 mm. The forewings are dark brown, and the distal area has a light irregular band a black dash mark. The hindwings are whitish to gray and have darker colored veins. [5]
A. ipsilon are seasonal migratory insects that travel south in the fall to escape harsh cold temperatures and travel north in the spring to escape extremely warm weather. Therefore, changes in thermoperiod as well as photoperiod may influence the onset of migration patterns in this species. Before migration southward in the fall, the reproductive system in both females and males shuts down to prevent copulation before winter. In the spring and early summer, though, before migration north, females release sex pheromones soon after eclosion. In one study, female moths collected from late April to early May were 100% mated. [2]
Several species of wasps prey on the black cutworm. Larvae parasitized by Meteorus leviventris, a type of parasitoid, eat 24% less vegetation and cut 36% fewer seedlings. Other parasitoids include several fly species such as Archytas cirphis , Bonnetia comta , Gonia sequax , [12] Eucelatoria armigera and Sisyropa eudryae. Ground beetles also eat black cutworm larvae. [5] Ants, specifically Lasius neoniger also prey on this species and feed on A. ipsilon eggs. [8]
An entomopathogenic nematode called Hexamermis arvalis is known to infect 60% of larvae in the central United States. This parasite ultimately kills the insect. The parasite thrives in moist soil conditions. [5]
Calling behavior is the act of females releasing sex pheromones in preparation for mating. Calling behavior increases within the first three days after eclosion but decreases as the females grow older. As well, as the females grow older, the onset time of calling behavior occurs earlier. Calling earlier allows older females to have increased mating success as they normally produce less sex pheromone and need to appear more attractive than younger females. The amount of sex pheromone in the body and calling behavior are coordinated on a time scale. [13]
Females produce a sex pheromone in the pheromone gland on their abdominal tips that attracts males for mating. Biosynthesis of the sex pheromone is controlled by a neurohormone called pheromone biosynthesis activating neuropeptide (PBAN). This 33-amino-acid-long peptide is present in both sexes in the brain-suboesophageal ganglions (Br-SOG) during both scotophase and photophase. It has been shown that the juvenile hormone is involved in the release of PBAN in both males and females. PBAN aids in pheromone production in females and pheromone responsiveness in males. [7] In another species, PBAN release has been shown to be stimulated by external factors including photoperiod, temperature and odorants from host plants [14]
The juvenile hormone (JH), released by the corpora allata (CA), is necessary for the production and release of the sex pheromone. The CA releases JH which acts on the production/release of the PBAN-like factor. So, PBAN is what connects the network in the CA to the central nervous system's production of sex pheromone. When the CA was removed, calling behavior and sex pheromone production stopped. As well, ovaries remained underdeveloped when the CA was absent. However, when decapitated females (meaning complete absence of the CA) were injected with a synthetic form of JH, ovaries were able to develop. This indicates that JH acts on the ovaries and production of sex pheromone in two independent neuroendocrine systems. [14]
In males, JH is necessary for pheromone responsiveness. When the CA was removed, males did not respond to female sex pheromones with sexual behavior. However, when the CA was implanted back, responsiveness and sexual behavior returned. [15]
A. ipsilon has a sensitive olfactory system with many proteins that are expressed in the antennae. Such proteins include odorant binding proteins (OBPs), chemosensory proteins (CSPs), odorant receptors (ORs), ionotropic receptors (IRs) and sensory neuron membrane proteins (SNMPs). These proteins are responsible for recognizing sex pheromone and general odorants, such as those released by host plants. [16]
Each larva can consume over 400 square centimetres of foliage during its development. They feed above ground until about the fourth instar. After that they do considerable damage to crops by severing young plants at ground level. In the midwestern US, the black cutworm is considered to be a serious pest of corn. Corn is very susceptible at the one-leaf stage, but by the four- or five-leaf stage, it is relatively unaffected. Damage to the underground parts of plants can also be harmful. [5] Other crops where serious damage occurs include cotton, maize, tobacco, sunflower, tomatoes, sugar beet and potato. [17]
There are three options to manage cutworm population and the incurred damages. Soil insecticides can be applied as a pre-plant treatment, although this may be limited by the unpredictability of cutworm population density distribution. These insecticides can also be applied as a planting-time treatment, although the same limitations still hold. The third option would be a rescue treatment that is applied after the infestations have occurred; this is also called the wait-and-see system. This may also be preferable due to a recently lower occurrence of outbreaks. [18]
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.
Juvenile hormones (JHs) are a group of acyclic sesquiterpenoids that regulate many aspects of insect physiology. The first discovery of a JH was by Vincent Wigglesworth. JHs regulate development, reproduction, diapause, and polyphenisms.
Agrotis segetum, sometimes known as the turnip moth, is a moth of the family Noctuidae. The species was first described by Michael Denis and Ignaz Schiffermüller in 1775. It is a common European species and it is found in Africa and across Eurasia except for the northernmost parts.
The cabbage looper is a medium-sized moth in the family Noctuidae, a family commonly referred to as owlet moths. Its common name comes from its preferred host plants and distinctive crawling behavior. Cruciferous vegetables, such as cabbage, bok choy, and broccoli, are its main host plant; hence, the reference to cabbage in its common name. The larva is called a looper because it arches its back into a loop when it crawls.
Cutworms are moth larvae that hide under litter or soil during the day, coming out in the dark to feed on plants. A larva typically attacks the first part of the plant it encounters, namely the stem, often of a seedling, and consequently cuts it down; hence the name cutworm. Cutworms are not worms, biologically speaking, but caterpillars.
The light brown apple moth is a leafroller moth belonging to the lepidopteran family Tortricidae.
The diamondback moth, sometimes called the cabbage moth, is a moth species of the family Plutellidae and genus Plutella. The small, grayish-brown moth sometimes has a cream-colored band that forms a diamond along its back. The species may have originated in Europe, South Africa, or the Mediterranean region, but it has now spread worldwide.
The European corn borer, also known as the European corn worm or European high-flyer, is a moth of the family Crambidae. It is a pest of grain, particularly maize. The insect is native to Europe, originally infesting varieties of millet, including broom corn. The European corn borer was first reported in North America in 1917 in Massachusetts, but was probably introduced from Europe several years earlier. Since its initial discovery in the Americas, the insect has spread into Canada and westwards across the United States to the Rocky Mountains.
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.
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.
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.
Peridroma saucia, the pearly underwing or variegated cutworm, is a moth of the family Noctuidae. The species was first described by Jacob Hübner in 1808. It is found in North and South America, Europe, Asia and Africa. The variegated cutworm feeds on many plants, especially common fruits and vegetables. The moth undergoes two to four generations per year. The development of the moth slows in colder temperatures, indicative of its migratory nature. All stages of the life cycle have a developmental threshold for temperature. The moth is known to migrate to the northern regions during warmer months, returning to the southern regions when the climate becomes colder.
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.
Zeiraphera canadensis, the spruce bud moth, is a moth of the family Tortricidae. It is a small brown moth mainly found in North America, specifically New Brunswick, Quebec, and the north-eastern United States. The adult moth flutters quickly, and stays low among trees during the day and higher above tree cover after sunset. The spruce bud moth relies primarily on the white spruce tree as a host plant. Both male and female spruce bud moths mate multiply, however males have the ability to secrete accessory gland proteins that prevent female re-mating. The moth is univoltine, meaning only one generation hatches per year, and its eggs overwinter from July to May. The species Z. ratzeburgiana is very similar to Z. canadensis and can only be distinguished by the presence of an anal comb in Z. canadensis.
Helicoverpa assulta, the oriental tobacco budworm, is a moth of the family Noctuidae. H. assulta adults are migratory and are found all over the Old World Tropics including Asia, Africa, and Australia.
The pheromone biosynthesis activation neuropeptide (PBAN) is a neurohormone that activates the biosynthesis of pheromones in moths. Female moths release PBAN into their hemolymph during the scotophase to stimulate the biosynthesis of the unique pheromone that will attract the conspecific males. PBAN release is drastically reduced after mating, contributing to the loss in female receptivity. In black cutworm, it has been shown that the juvenile hormone helps induce release of PBAN which goes on to influence pheromone production and responsiveness in females and males, respectively. In the oriental tobacco budworm, the circadian rhythm of pheromone production is closely associated with PBAN release.
Ostrinia furnacalis is a species of moth in the family Crambidae, the grass moths. It was described by Achille Guenée in 1854 and is known by the common name Asian corn borer since this species is found in Asia and feeds mainly on corn crop. The moth is found from China to Australia, including in Java, Sulawesi, the Philippines, Borneo, New Guinea, the Solomon Islands, and Micronesia. The Asian corn borer is part of the species complex, Ostrinia, in which members are difficult to distinguish based on appearance. Other Ostrinia such as O. orientalis, O. scapulalis, O. zealis, and O. zaguliaevi can occur with O. furnacalis, and the taxa can be hard to tell apart.
Insect olfaction refers to the function of chemical receptors that enable insects to detect and identify volatile compounds for foraging, predator avoidance, finding mating partners and locating oviposition habitats. Thus, it is the most important sensation for insects. Most important insect behaviors must be timed perfectly which is dependent on what they smell and when they smell it. For example, olfaction is essential for locating host plants and hunting prey in many species of insects, such as the moth Deilephila elpenor and the wasp Polybia sericea, respectively.
Euthyrhynchus floridanus, the Florida predatory stink bug, is a species of carnivorous shield bug in the family Pentatomidae, the only species in the genus Euthyrhynchus. It is native to the hottest parts of the southeastern United States and is considered beneficial because its diet includes many species of pest insects.
The white worm beetle is a species of beetle in the family Scarabaeidae. It is the only species in the genus Hylamorpha. This beetle is native to South America, particularly in regions of Argentina, Brazil, and Uruguay.