physics

Lymantria dispar multicapsid nuclear polyhedrosis virus

Lymantria dispar multicapsid nuclear polyhedrosis virus is a physics topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lymantria dispar multicapsid nuclear polyhedrosis virus rather than just read about it. In short: Lymantria dispar multicapsid nuclear polyhedrosis virus or LdMNPV is a viral infection in Lymantria dispar (gypsy moth, also termed spongy moth), that causes infected larvae to die and disintegrate. Infected larvae climb to the top of a tree and die.

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Reference excerpt

Lymantria dispar multicapsid nuclear polyhedrosis virus or LdMNPV is a viral infection in Lymantria dispar (gypsy moth, also termed spongy moth), that causes infected larvae to die and disintegrate. Infected larvae climb to the top of a tree and die. The larvae then melt or disintegrate, falling onto the foliage below, where they infect more larvae. Often referred to as Gypchek, the virus goes by multiple names. Gypchek is an insecticide which uses the virus to control the gypsy moth population. Because the virus only infects L. dispar, it has proven safe for use with other insects including ants, bees and non-target lepidopteran species. Studies of its safety have found no toxicity or mortality concerns, though ocular doses administered to rabbits did cause some irritation. The gene responsible for the behavior of infected larvae has been found to be egt (codes ecdysteroid UDP-glucosyltransferase), with the protein tyrosine phosphatase (PTP) playing a role in the infection of brain tissue. Due to the virus' effect on the infected larvae, various reports of zombie caterpillars popularized the virus at the time of the discovery of the egt gene.

Virus name Since it was first recorded, LdMNPV has been gone under numerous common names, taxonomical names, and acronyms. It was first reported in 1891 as Wipfelkrankheit, which is German for "treetop disease". This term is also used in English, as is "wilt disease". The term "flacherie", a name that refers to an entirely different disease, was once identified as this virus. Another antiquated term, "caterpillar cholera", was also used early in the 20th century. The virus has also been referred to as Borralinivirus reprimens. It has many modern names, including "gypsy moth nucleopolyhedrosis virus", Lymantria dispar MNPV, Lymantria dispar multinucleocapsid nuclear polyhedrosis virus, Lymantria dispar nuclear polyhedrosis virus, Lymantria dispar nucleopolyhedrovirus, and Lymantria disper nuclear polyhedrosis virus, with varying acronyms attached or unattached including LdMNPV, and LdNPV. Currently, as by taxonomy, the viral species is known as Lymantria dispar multiple nucleopolyhedrovirus.

Transmission and effects It is transmitted orally, when the larvae ingest material contaminated with the virus. The pathogen invades through the gut wall. It reproduces in the internal tissues, causing disintegration of internal organs and death, within 10–14 days. The host ruptures, distributing viral occlusion bodies into the environment to infect other individuals.

Effect on population When it is used as a pesticide to control outbreaks, it is referred to as "Gypchek".

Behavior changes Unaffected larvae feed at night and hide during the day. The virus instead drives the larva to the canopy of the tree and die. The exact mechanism for how the virus induces the larva to climb to a high vantage point before dying has been linked to a gene in the virus that causes infected cells to produce an enzyme which inactivates the hormone that triggers molting behavior. The molting hormone causes the caterpillar to stop eating, particularly in preparation for molting, and the inactivation of this behavior moderating hormone causes the caterpillar to continue to climb to the canopy where it would feed before the virus destroys the caterpillar's internal organs. The larva liquefies and releases millions of virus particles to spread and infect other moth larvae. Even if it does not reach the top of the tree, the infected larva will migrate to the exposed parts of the plant. Infected larvae are also paler due to the body being filled with viral occlusions. Predators like birds are a source for the spread of the virus. The infected larvae are consumed and the virus is viable after its passage as feces, facilitating its spread.

Gypchek Gypchek is the registered name of LdMNPV, produced by the U.S. Forest Service. It is produced in vivo in gypsy moth larvae reared under controlled conditions. It was registered in April 1978 with the U.S. Environmental Protection Agency, as an insecticide for aerial and ground use. It was re-registered in 1996 after satisfying the requirements of the EPA. It is used to control very high population densities, i.e. outbreaks. Gypchek is applied by airplane or helicopter. The U.S. Forest Service studied LdMNPV for its potential use as a microbial insecticide due to a variety of reasons. LdMNPV is naturally occurring and was implicated in population collapse. The virus is environmentally safe and targets the gypsy moth. It is also able to spread the infection and persist. Its use as a direct control agent was proven in the field. Performance of Gypchek was erratic in early formulations, but has been refined.

Production LdMNPV cannot be mass-produced. In order to produce Gypchek, a laboratory strain of the gypsy moth is reared and infected with the virus. After the larvae die, they are harvested and processed into a fine powder. It takes between 500 and 1,000 larvae to produce enough Gypchek to treat one acre (1,200 and 2,500/ha).

Use Use is limited to pest control programs by government entities. It is applied from the ground or the air. Gypchek is not a contact pesticide, the larvae must consume the virus to become infected. Between 1995 and 2003, Gypchek was applied to 53,034 acres (21,462 ha) total.

Safety The virus polyhedrals comprise 12% of Gypchek with larvae body parts and other inert solids making up the remaining 88%. Gypchek's toxicological and pathogenicity testing revealed no effects on laboratory animals, wild mammals, birds, and fish at field doses. While it is non-toxic to warm-blooded animals, impurities may cause eye irritation. The appearance is listed as, "dried insect body parts and virus polyhedral" and has a musty odor. For handlers and mixers, normal clothes, a medical face mask and goggles are recommended. In case of skin contact, wash with soap and water. If in eyes, flush with water. If irritation persists, seek medical attention.

Toxicity LdMNPV has undergone numerous tests in regards to toxicity and mortality, all of which show no adverse effects except varying irritation for ocular doses administered to the eyes of rabbits. LdMNPV was found to not infect other members of the order Lepidoptera, or Hymenoptera-order insects such as ants and bees.

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Worked examples

Example 1 — a first encounter with Lymantria dispar multicapsid nuclear polyhedrosis virus

Start with the simplest possible case. Write down what Lymantria dispar multicapsid nuclear polyhedrosis virus claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In physics, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lymantria dispar multicapsid nuclear polyhedrosis virus before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lymantria dispar multicapsid nuclear polyhedrosis virus ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lymantria dispar multicapsid nuclear polyhedrosis virus

In research: Lymantria dispar multicapsid nuclear polyhedrosis virus appears in physics research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lymantria dispar multicapsid nuclear polyhedrosis virus in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lymantria dispar multicapsid nuclear polyhedrosis virus is common in secondary-school and first-year university syllabi. It links to neighbouring topics Baculoviridae, Insect viral diseases, Lymantria dispar, so understanding it makes those chapters shorter.
In everyday life: Look for Lymantria dispar multicapsid nuclear polyhedrosis virus outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lymantria dispar multicapsid nuclear polyhedrosis virus in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lymantria dispar multicapsid nuclear polyhedrosis virus means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
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Frequently asked questions

What is Lymantria dispar multicapsid nuclear polyhedrosis virus in simple terms?

Why does Lymantria dispar multicapsid nuclear polyhedrosis virus matter?

Because it connects several physics ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lymantria dispar multicapsid nuclear polyhedrosis virus?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lymantria dispar multicapsid nuclear polyhedrosis virus.