| Delia floralis | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Class: | Insecta |
| Order: | Diptera |
| Family: | Anthomyiidae |
| Genus: | Delia |
| Species: | D. floralis |
| Binomial name | |
| Delia floralis (Fallén, 1824)) | |
| Synonyms | |
Delia floralis, commonly known as the turnip root fly or summer cabbage fly, is a cosmopolitan pest of crops. The larvae or maggots feed on the roots of various plants in the family Brassicaceae.
This species resembles the closely related cabbage root fly in appearance though it is slightly larger at seven to eight millimetres long. The body is light gray and the yellowish wings are transparent with yellow veins. Over most of its range, there is only one generation of this fly each year. The eggs are laid seven to ten days after the adult has emerged from the pupa. They are white and cigar-shaped and are laid in groups of thirty or forty eggs at the root collar of the host plant or on the ground nearby. Often several females lay eggs on one plant. The glossy white or yellow larvae hatch in five to fourteen days. They feed for about forty days, moulting three times, eating the young roots or tunneling into the main root of the host plant [2] or even penetrating into the basal part of the leaves of hearting cabbage. The pupae are brown and about six millimetres in length. The insect overwinters as a pupa in the ground at a depth of five centimetres or more. [3] The pupae can endure frosts of -33 °C and in the following year the adults emerge at varying dates, doing so when the soil temperature reaches 18 °C at the depth of the pupae. [2]
The turnip root fly is found in Western Europe, Russia, Northeast China, Korea, Japan and North America. [2]
The larvae damage the roots of cabbage, turnip, radish, swede and other cruciferous crops. The growth of damaged plants is slow and development is poor resulting in a reduced yield. [2] Large scale attacks cause cessation of growth with the plants exhibiting a leaden hue and wilting, subsequently turning yellow and dying. [3] Control measures include the early planting of strong plants, the use of peat-compost pots, the use of additional fertilizer, deep autumn ploughing after the harvesting of cruciferous crops and insecticide treatments. [2]
Cabbage, comprising several cultivars of Brassica oleracea, is a leafy green, red (purple), or white biennial plant grown as an annual vegetable crop for its dense-leaved heads. It is descended from the wild cabbage, and belongs to the "cole crops" or brassicas, meaning it is closely related to broccoli and cauliflower ; Brussels sprouts ; and Savoy cabbage.
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 sometimes called cole crops—derived from the Latin caulis, denoting the stem or stalk of a plant.
A pupa is the life stage of some insects undergoing transformation between immature and mature stages. Insects that go through a pupal stage are holometabolous: they go through four distinct stages in their life cycle, the stages thereof being egg, larva, pupa, and imago. The processes of entering and completing the pupal stage are controlled by the insect's hormones, especially juvenile hormone, prothoracicotropic hormone, and ecdysone. The act of becoming a pupa is called pupation, and the act of emerging from the pupal case is called eclosion or emergence.
Pieris rapae is a small- to medium-sized butterfly species of the whites-and-yellows family Pieridae. It is known in Europe as the small white, in North America as the cabbage white or cabbage butterfly, on several continents as the small cabbage white, and in New Zealand as the white butterfly. The butterfly is recognizable by its white color with small black dots on its wings, and it can be distinguished from P. brassicae by its larger size and the black band at the tip of its forewings.
The Anthomyiidae are a large and diverse family of Muscoidea flies. Most look rather like small houseflies. Most species are drab grey to black. Many Pegomya are yellow, and some members of the genera Anthomyia and Eutrichota are patterned in black-and-white or black-and-silvery-grey. Most are difficult to identify, apart from a few groups such as the kelp flies that are conspicuous on beaches.
Delia flies are members of the Anthomyiidae family within the superfamily Muscoidae. The identification of different species of Delia can be very difficult for non-specialists as the diagnostic characteristics used for immature and/or female specimens may be inconsistent between species. Past taxonomic keys were not as comprehensive in their identification of Delia specimens; they were either too reliant on genetic characteristics, focused solely on a specific life stage, or were focused only on certain species. However current taxonomic keys aim to be more thorough by not only including morphological diagnostics for males, females, and immature specimens of various species, but also their genetic make-up or molecular barcode.
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.
Delia radicum, known variously as the cabbage fly, cabbage root fly, root fly or turnip fly, is a pest of crops. The larvae of the cabbage root fly are sometimes known as the cabbage maggot or root maggot. Delia brassicae was the most common name in literature prior to 1981. The adult flies are about 1 cm long and are grey in colour, but otherwise resemble the common house fly.
Helicoverpa punctigera, the native budworm, Australian bollworm or Chloridea marmada, is a species of moth in the family Noctuidae. This species is native to Australia. H. punctigera are capable of long-distance migration from their inland Australian habitat towards coastal regions and are an occasional migrant to New Zealand.
Eurydema oleracea is a species of shield bug in the family Pentatomidae and is commonly known as the rape bug, the crucifer shield bug, the cabbage bug or the brassica bug.
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.
Ascia is a genus of butterflies in the family Pieridae. It is monotypic, being represented by the single species Ascia monuste, commonly known as the great southern white, In this species the sexes may differ with the female being either light or dark colored. It is found from the Atlantic and Gulf coasts of the United States, and south to Argentina. It is migratory along the south-eastern coast of the United States, with strays to Maryland, Kansas, and Colorado.
Delia antiqua, commonly known as the onion fly, is a cosmopolitan pest of crops. The larvae or maggots feed on onions, garlic, and other bulbous plants.
Cycloneda sanguinea, also known as the spotless lady beetle, is a widespread species of ladybird beetle in the Americas.
Hylobius transversovittatus is a species of weevil in the family Curculionidae. It is native to the Old World where both adults and larvae feed on purple loosestrife. This plant is regarded as an invasive species in North America and the weevil has been introduced into both the United States and Canada in an effort to control the plant.
Lipaphis erysimi is a species of aphid of the family Aphididae. Its common names include mustard aphid and turnip aphid. It is found in most temperate and tropical areas of the world and feeds only on cruciferous plants. The insects are almost exclusively female and are very prolific, with wingless females producing around one hundred young during a lifespan of a few weeks.
A gnat is any of many species of tiny flying insects in the dipterid suborder Nematocera, especially those in the families Mycetophilidae, Anisopodidae and Sciaridae. Most often they fly in large numbers, called clouds. "Gnat" is a loose descriptive category rather than a phylogenetic or other technical term, so there is no scientific consensus on what constitutes a gnat. Some entomologists consider only non-biting flies to be gnats. Certain universities and institutes also distinguish eye gnats: the Smithsonian Institution describes them as "non-biting flies, no bigger than a few grains of salt, ... attracted to fluids secreted by your eyes".
Anastrepha fraterculus, known as the South American fruit fly, is a fruit fly species from the genus Anastrepha. A. fraterculus is a polyphagous, frugivorous fly that is a significant pest of commercial fruit production in South America.
Aleochara bilineata is a species of rove beetle that lives in sub-tropical and cold tolerant climates throughout the world. This beetle was first biologically described by Wadsworth in 1915. It is used by humans as crop pest control due to the variety of pests it consumes, including caterpillars, mealybugs, mites, maggots. These beetles have a larval phase that occurs over the winter and an adult phase that emerges in the spring. They are often found in moist environments, in compost, or near crops.
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