''Achaea janata'', the castor semi-looper or croton caterpillar, is an erebid

moth Moths are a group of insects that includes all members of the order Lepidoptera that are not Butterfly, butterflies. They were previously classified as suborder Heterocera, but the group is Paraphyly, paraphyletic with respect to butterflies (s ...

, the

caterpillar Caterpillars ( ) are the larval stage of members of the order Lepidoptera (the insect order comprising butterflies and moths). As with most common names, the application of the word is arbitrary, since the larvae of sawflies (suborder ...

s 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 New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...

and east through the Pacific archipelagoes to

Easter Island Easter Island (, ; , ) is an island and special territory of Chile in the southeastern Pacific Ocean, at the southeasternmost point of the Polynesian Triangle in Oceania. The island is renowned for its nearly 1,000 extant monumental statues, ...

. It is a major pest of

castor Castor most commonly refers to: *Castor (star), a star in the Gemini constellation *Castor, one of the Dioscuri/Gemini twins Castor and Pollux in Greco-Roman mythology Castor or CASTOR may also refer to: Science and technology *Castor (rocket s ...

throughout the world.

Description

Its wingspan is about 60–70 mm. The species has a pale reddish-brown body. Forewings with prominent markings. A short sub-basal waved line and an obliquely waved antemedial and excised postmedial lines are present. Postmedial lines are often black suffused inside them. A speck is found at the end of the cell. A diffuse rufous band runs beyond the postmedial line, Hindwings black with medial white band. Three large white spots can be seen on outer margin, with whitish cilia. Ventral side grey suffused. Forewings with an oblique white postmedial band not reaching the costa. Two crenulate medial lines found on each wing. Eggs are small, spherical with a greenish color. Pupa is whitish green. Larva bluish grey speckled with blue black. Head black striped. Lateral and sub-lateral yellowish bands with intervening blue-grey line. A dorsal black stripe bordered by reddish-white spots between fourth and fifth somites. There is a pair of dorsal red tubercles on anal somite. Spiracles and forelegs are red. Four larval

instar An instar (, from the Latin '' īnstar'' 'form, likeness') is a developmental stage of arthropods, such as insects, which occurs between each moult (''ecdysis'') until sexual maturity is reached. Arthropods must shed the exoskeleton in order to ...

s are completed before pupal stage. They feed on '' Excoecaria cochinchinensis'' (

Euphorbiaceae Euphorbiaceae (), the spurge family, is a large family of flowering plants. In English, they are also commonly called euphorbias, which is also the name of Euphorbia, the type genus of the family. Most spurges, such as ''Euphorbia paralias'', ar ...

), castor oil plant (''

Ricinus communis ''Ricinus communis'', the castor bean or castor oil plant, is a species of perennial flowering plant in the spurge family, Euphorbiaceae. It is the sole species in the monotypic genus, ''Ricinus'', and subtribe, Ricininae. The evolution of ca ...

''), both ''

Brassica ''Brassica'' () is a genus of plants in the cabbage and mustard family (Brassicaceae). The members of the genus are informally known as cruciferous vegetables, cabbages, mustard plants, or simply brassicas. Crops from this genus are sometim ...

'' and ''

Ficus ''Ficus'' ( or ) is a genus of about 850 species of woody trees, shrubs, vines, epiphytes and hemiepiphytes in the family (biology), family Moraceae. Collectively known as fig trees or figs, they are native throughout the tropics with a few spe ...

'' species and many more crops like ''

Arachis hypogaea The peanut (''Arachis hypogaea''), also known as the groundnut, goober (US), goober pea, pindar (US) or monkey nut (UK), is a legume crop grown mainly for its edible seeds. It is widely grown in the tropics and subtropics by small and large ...

'', ''

Citrus ''Citrus'' is a genus of flowering trees and shrubs in the family Rutaceae. Plants in the genus produce citrus fruits, including important crops such as oranges, mandarins, lemons, grapefruits, pomelos, and limes. ''Citrus'' is nativ ...

'', ''

Corchorus ''Corchorus'' is a genus of about 40–100 species of flowering plants in the family Malvaceae, native to tropical and subtropical regions throughout the world. Different common names are used in different contexts, with jute applying to the fi ...

'', ''

Dalbergia sissoo ''Dalbergia sissoo'', known commonly as North Indian rosewood or shisham, is a fast-growing, hardy, deciduous rosewood tree native to the Indian subcontinent and southern Iran. ''D. sissoo'' is a large, crooked tree with long, leathery leaves a ...

'', ''

Dodonaea viscosa ''Dodonaea viscosa'', also known as the broadleaf hopbush, is a species of flowering plant in the ''Dodonaea'' (hopbush) genus that has a cosmopolitan distribution in Tropics, tropical, Subtropics, subtropical and warm temperate regions of Africa ...

'', '' Euphorbia hirta'', ''

Glycine max The soybean, soy bean, or soya bean (''Glycine max'') is a species of legume native to East Asia, widely grown for its edible bean. Soy is a staple crop, the world's most grown legume, and an important animal feed. Soy is a key source of f ...

'', ''

Lagenaria siceraria Calabash (; ''Lagenaria siceraria''), also known as bottle gourd, white-flowered gourd, long melon, birdhouse gourd, New Guinea bean, New Guinea butter bean, Tasmania bean, and opo squash, is a vine grown for its fruit. It can be either harvest ...

'', ''

Punica granatum The pomegranate (''Punica granatum'') is a fruit-bearing deciduous shrub in the family Lythraceae, subfamily Punicoideae, that grows between tall. Rich in symbolic and mythological associations in many cultures, it is thought to have originat ...

'', ''

Rosa chinensis ''Rosa chinensis'' (), known commonly as the China rose, Chinese rose, or Bengal rose, is a member of the genus '' Rosa'' native to Southwest China in Guizhou, Hubei, and Sichuan Provinces. The first publication of ''Rosa chinensis'' was in 1768 ...

'', ''

Solanum lycopersicum The tomato (, ), ''Solanum lycopersicum'', is a plant whose fruit is an edible berry that is eaten as a vegetable. The tomato is a member of the nightshade family that includes tobacco, potato, and chili peppers. It originated from and was d ...

'', ''

Tamarindus indica Tamarind (''Tamarindus indica'') is a leguminous tree bearing edible fruit that is indigenous to tropical Africa and naturalized in Asia. The genus ''Tamarindus'' is monotypic, meaning that it contains only this species. It belongs to the f ...

'', ''

Theobroma cacao ''Theobroma cacao'' (cacao tree or cocoa tree) is a small ( tall) evergreen tree in the Malvaceae family. Its seedscocoa beansare used to make chocolate liquor, cocoa solids, cocoa butter and chocolate. Although the tree is native to the tropi ...

'', ''

Vigna mungo The black gram or urad bean (''Vigna mungo'') is a bean grown in South Asia. Like its relative the mung bean, it has been reclassified from the genus ''Phaseolus'' to '' Vigna''. The product sold as black gram is usually the whole urad bean, wh ...

'' and ''

Ziziphus mauritiana ''Ziziphus mauritiana'', also known as Indian jujube, Indian plum, Chinese date, Chinese apple, ber and dunks is a tropical fruit tree species belonging to the family Rhamnaceae. It is often confused with the closely related jujube, Chinese ju ...

''.

Attack and control

As they feed off the castor oil plant they may be extremely poisonous and should be avoided at all costs. Caterpillars damage foliage, resulting in defoliation and reduction of photosynthesis process. They also attack stems and bore into them, and finally the whole plant wilts and dies. Efforts to control the species are mainly mechanical, biological and chemical methods. Hand picking of late instars and usage of

pheromone trap A pheromone trap is a type of insect trap that uses pheromones to lure insects. Sex pheromones and aggregating pheromones are the most common types used. A pheromone-impregnated lure is encased in a conventional trap such as a bottle trap, delta ...

s and light traps are effective in removing adults. Many

parasitoid In evolutionary ecology, a parasitoid is an organism that lives in close association with its host (biology), host at the host's expense, eventually resulting in the death of the host. Parasitoidism is one of six major evolutionarily stable str ...

s are used in biological control. Eggs can be destroyed using '' Trichogramma evanescens''. '' Microplitis maculipennis'' is effective against caterpillars. Chalcid species '' Euplectrus'' and another a braconid, '' Rhogas'' are also used. In chemical control, quinalphos,

chlorpyrifos Chlorpyrifos (CPS), also known as chlorpyrifos ethyl, is an organophosphate pesticide that has been used on crops, animals, in buildings, and in other settings, to kill several pests, including insects and worms. It acts on the nervous systems ...

carbaryl Carbaryl (1-naphthyl methylcarbamate) is a chemical in the carbamate family used chiefly as an insecticide. It is a white crystalline solid previously sold under the brand name Sevin, which was a trademark of the Bayer Company. Union Carbide disc ...

monocrotophos Monocrotophos is an organophosphate insecticide. It is acutely toxic to birds and humans, so it has been banned in the U.S., the E.U., India and many other countries. Uses Monocrotophos is principally used in agriculture, as a relatively cheap pe ...

endosulphan Endosulfan is an organochlorine insecticide and acaricide, which acts by blocking the GABA-gated chloride channel of the insect ( IRAC group 2A). It became highly controversial due to its acute toxicity, potential for bioaccumulation, and role as ...

sprays are used. Neem seed kernel extract sprays are used to destroy eggs.

Gallery

File:Starr 020124-0038 Ricinus communis.jpg, Caterpillars, lateral view File:Achaea janata caterpillar. Dededo, Guam.jpg, Caterpillar, head and dorsal view File:Achaea janata caterpillar on Phyllanthus marianus. Dededo, Guam.jpg, Caterpillar on ''Phyllanthus marianus'', lateral view File:Achaea janata male ventral.jpg, Male, ventral view File:Achaea janata male dorsal.jpg, Male, dorsal view File:Achaea janata female ventral.jpg, Female, ventral view File:Achaea janata female dorsal.jpg, Female, dorsal view

References

External links

Species infoLife cycle of castor semilooper [''Achaea janata'' Linn.] and its controlDifferential oxidative stress responses in castor semilooper, ''Achaea janata''Induction of glutathione S-transferase in the castor semilooper, ''Achaea janata'' (Lepidoptera, Noctuidae) following fenitrothion treatmentCalling behaviour and male response to pheromone gland extracts of castor semilooper, ''Achaea janata''
{{Taxonbar , from=Q4673374 janata Moths of Oceania Moths of Asia Moths of Japan Moths of New Zealand Moths described in 1758 Taxa named by Carl Linnaeus