Diparopsis castanea

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Diparopsis castanea
Red bollworm moth.jpg
Red bollworm moth
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Lepidoptera
Superfamily: Noctuoidea
Family: Noctuidae
Subfamily: Hadeninae
Genus: Diparopsis
Species:
D. castanea
Binomial name
Diparopsis castanea
Hampson, 1902

Diparopsis castanea [1] is the type species of the genus Diparopsis : moths in the family Noctuidae; no subspecies are listed in the Catalogue of Life. [2] This is known as the red bollworm , which is a significant pest of cotton crops in Eastern and Central-Southern Africa.

Contents

Host Plants and Life cycle

Diparopsis castanea is oligophagous: being totally restricted to cultivated and wild cotton ( Gossypium spp.), and a rare wild host plant: Cienfuegosia hildebrandtii (also in the tribe Gossypieae).

The sky blue eggs are laid singly on stems leaves and bracts and hatch in to larvae that rapidly seek out and penetrate seed capsules (i.e. bolls). The most effective chemical treatments against this pest include sprays that are directed against the eggs and first instar, because after this stage the larvae remain inside the bolls. [3] The main infestation occurs during mid to late crop stage, and as the pupae can undergo diapause, the pest readily survives the dry season.

Pest Status and Management

Integrated pest management includes implementation of a close season, during which farmers' fields must be cleared of all cotton plant material for at least two months; this has been mandatory in Zimbabwe since the 1930s and in Malawi since 1965. In the presence of a continuous supply of food plant material populations can increase and cause severe crop loss. Low level, persistent infestations represented by 1 egg observed for every 10 plants may cause significant losses; [4] in Zimbabwe, the normal threshold is 6 eggs on 24 plants. [5] Monitoring recommendations involve accumulating numbers of eggs over two or three consecutive counts.

Diparopsis is readily controlled by well-timed insecticide applications. Originally, chemicals such as DDT and carbaryl were recommended, but since the 1980s chemicals have included the pyrethroid insecticides. The eggs are more evenly distributed throughout the plant than Helicoverpa bollworms, so spray penetration is more important for effective treatment. [6]

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

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Diamondback moth Species of moth

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<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>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.

Fall armyworm Species of moth

The fall armyworm is a species in the order Lepidoptera and is the larval life stage of a fall armyworm moth. 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 practice cannibalism as a disease control mechanism.

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False codling moth Species of moth in family Tortricidae

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<i>Alabama argillacea</i> Genus and species of insect

Alabama argillacea, the cotton leafworm or cotton worm, is a moth of the family Erebidae. It is native to the New World, but has been extirpated from the United States and Canada, having not been recorded since 1998. In the Neotropics, it can be found from Mexico to northern Argentina. The larva is considered a pest of cotton. They feed on the leaves, twigs, and buds.

The Coconut black headed caterpillar, is a species of moth found in multiple regions throughout East Asian countries including Bangladesh, India, Sri Lanka, Myanmar, as well as Indonesia. It is considered a pest to these countries, as they infest coconut palm trees, causing considerable damage to the trees, and reducing the plant's yield significantly. This is a great burden to all countries who experience infestations, as coconut is one of the main crops driving the economy. The species exists on coconut palms in all forms, from larval to moth, and utilizes the tree fronds as a main source of nutrition. Various methods of control have been explored, yet the primary control method is the administration of pesticides directly to the root of the coconut palms.

Liriomyza sativae, commonly known as the vegetable leaf miner, is a species of insect, a fly in the family Agromyzidae. The larvae of this fly mine the leaves of a range of vegetables and weeds, but seem to favour plants in the families Cucurbitaceae, Fabaceae and Solanaceae.

Metisa plana is a moth of the family Psychidae first described by Francis Walker in 1883. It is found in Sumatra, Malaysia and Sri Lanka. It is a major pest on Elaeis guineensis, the African oil palm.

References

  1. Hampson GF (1902) The moths of South Africa (Part II). Annals of the South African Museum
  2. Roskov Y.; Kunze T.; Orrell T.; Abucay L.; Paglinawan L.; Culham A.; Bailly N.; Kirk P.; Bourgoin T.; Baillargeon G.; Decock W.; De Wever A. (2011). Didžiulis V. (ed.). "Species 2000 & ITIS Catalogue of Life: 2011 Annual Checklist". Species 2000: Reading, UK. Retrieved 11 August 2018.
  3. Matthews GA (1989) Cotton Insect Pests and their Management Longman.
  4. Nyirenda GKC (1986) Studies of the Effects of Insecticide Application on Cotton in Malawi. PhD. Thesis: University of London.
  5. Anon. (1985) Cotton Handbook (1985 - complete revision). Published by Spectrum (Pvt.) on behalf of The Zimbabwe Cotton Growers Association.
  6. Matthews GA, Mowlam MD (1974) Some Aspects of the Biology of Cotton Insects and their Control with U.L.V. Spraying in Malawi. British Crop Protection Council Monograph No. 11 pp. 44-52.