This article is written like a research paper or scientific journal .(April 2023) |
Cnaphalocrocis medinalis | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | Insecta |
Order: | Lepidoptera |
Family: | Crambidae |
Genus: | Cnaphalocrocis |
Species: | C. medinalis |
Binomial name | |
Cnaphalocrocis medinalis (Guenée, 1854) | |
Synonyms | |
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Cnaphalocrocis medinalis, the rice leafroller, is a species of moth of the family Crambidae. It is found in south-east Asia, including Hong Kong, Sri Lanka, Taiwan, Thailand and most of Australia.
This moth typically has a wingspan of approximately 16 millimeters.
Its larvae are recognized as pests of various crops, including Oryza sativa , Zea mays , and Triticum , Saccharum and Sorghum species.
The adult moth is characterized by its vibrant yellow or straw coloration, with distinct wavy lines visible on its forewings and hindwings. Eggs are usually laid individually or in groups on the undersides of leaves, appearing scaly and white. A female moth can lay around 56 eggs, with an incubation period lasting between 4 and 8 days. Larvae go through 5 to 6 instars over a period of approximately 22 to 23 days before pupating within folded leaves for about 6 to 7 days. Fully grown caterpillars are green and measure around 16.5 millimeters in length. The entire life cycle of this moth spans about 5 weeks.
Throughout its life stages, the rice leafroller can cause significant damage to crops. Newly hatched caterpillars initiate damage by cutting leaf edges and folding them. In the case of young seedlings, they may fold multiple adjacent leaves and consume the green tissue, leaving affected leaves with a whitish appearance. A single caterpillar can damage numerous leaves, leading to reduced plant vigor and eventual crop yield loss, which can range from 10% to 50%. This pest poses a more severe threat during the boot leaf stage of crop development.
The eggs of the rice leafroller are typically elliptical and flat, measuring about 1 millimeter in length. Initially, they appear milky white, later transitioning to a yellow-brown hue with a visible black spot before hatching.
Larvae of the rice leafroller typically undergo five instars. When mature, they measure between 15 and 18 millimeters in length. They have a brown head, the thorax and abdomen are green at first, then become yellowish-green, and reddish brown when they are mature. There are two spiral-shaped black lines at the posterior margin of the tergum of the front thorax and 8 distinct small black circles at the tergum of the middle and posterior thorax, among which there were six leading edges and two trailing edges. [1]
Pupae of the rice leafroller measure approximately 9 millimeters in length. The 5th to 7th abdominal segments near the leading edge exhibit a single line of dark brown fine hair. The tail tip of the pupa possesses eight barbs, and the pupa is enclosed within a white, thin cocoon.
Adult rice leafrollers typically measure between 7 and 9 millimeters in length, with a wingspan ranging from 13 to 18 millimeters. They exhibit a flaxen coloration, with three brown transverse belts on the prothorax, one of which is relatively coarse and short. Male moths feature a shining and concave eyespot on the central part of the prothorax's leading edge, whereas female moths lack this eyespot.
Rice leafrollers are harmful at the stage of larva. A single larva can consume approximately 25 square centimetres (4 in2) of leaf tissue, constituting less than 40% of a normal leaf of rice. Generally, the 1st-instar larva crawled into the heart leaf or the leaf sheath nearby, and the 2nd-instar larva began to spin silk at the leaf tip, and then began to turn into a small insect bud after the 3rd-instar. The food intake at 4th and 5th instar, which accounting for more than 90% of the total food intake of the larva. Although, there are some differences between different generations. [2]
Rice (Oryza sativa L.) is the most important staple food for more than half of the world population including India. It is grown on an estimated 41.85 million hectares (103.4 million acres) in India with a production of 102 million metric tons (112 million short tons). Insect pests inflict an average of 21%–51% yield loss in rice, which leads to one of the major reasons for poorer crop productivity in India. The leaf folder infestation may cause more than 50% of leaf damage with significant yield losses. [3]
Reform the tillage system and cultivation system, rational fertilization, avoid the early growth of rice, late ripening. Also, the damage of rice leaf roller could be reduced by avoiding early, middle and late rice mixed cropping. It is also possible to reduce the damage of pests through variety layout, setting up trapping and killing fields and reducing application area. It is also possible to harvest early rice according to the growth rate of the leaf roller, and then kill some larvae and pupae in deep water, so as to reduce the birth rate of the next generation. [4]
Because rice leaf roller has phototaxis, it has a strong tendency to approach metal halogen lamps, and farmers can use light to lure and kill pests. Lure insect lamp has the advantage of quick, effective, and simple operation. It rarely requires medicament, and does not cause environmental pollution. [5]
Application of chemical pesticide results in drag resistance and re-occurrence of the pests, and also kills natural predators of the pests. However, natural predators can effectively control the pest. [6] It is estimated that there are more than 130 natural predators of rice leaf roller. Therefore, the protection and utilization of natural predators is very important to improve the sustainability of rice pest management. [7] [8]
Bt crops are effective. [9] According to different generations, the use of pesticides should be reasonably arranged and used alternately to prevent the resistance of rice leaf roller. [10]
Caterpillars are the larval stage of members of the order Lepidoptera.
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.
Pieris brassicae, the large white, also called cabbage butterfly, cabbage white, cabbage moth (erroneously), or in India the large cabbage white, is a butterfly in the family Pieridae. It is a close relative of the small white, Pieris rapae.
The codling moth is a member of the Lepidopteran family Tortricidae. They are major pests to agricultural crops, mainly fruits such as apples and pears, and a codling moth larva is often called an "apple worm". Because the larvae are not able to feed on leaves, they are highly dependent on fruits as a food source and thus have a significant impact on crops. The caterpillars bore into fruit and stop it from growing, which leads to premature ripening. Various means of control, including chemical, biological, and preventive, have been implemented. This moth has a widespread distribution, being found on six continents. Adaptive behavior such as diapause and multiple generations per breeding season have allowed this moth to persist even during years of bad climatic conditions.
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 African armyworm, also called okalombo, kommandowurm, or nutgrass armyworm, is a species of moth of the family Noctuidae. The larvae often exhibit marching behavior when traveling to feeding sites, leading to the common name "armyworm". The caterpillars exhibit density-dependent polyphenism where larvae raised in isolation are green, while those raised in groups are black. These phases are termed solitaria and gregaria, respectively. Gregaria caterpillars are considered very deleterious pests, capable of destroying entire crops in a matter of weeks. The larvae feed on all types of grasses, early stages of cereal crops, sugarcane, and occasionally on coconut. The solitaria caterpillars are less active and undergo much slower development. The species is commonly found in Africa, but can also be seen in Yemen, some Pacific islands, and parts of Australia. African armyworm outbreaks tend to be devastating for farmland and pasture in these areas, with the highest-density outbreaks occurring during the rainy season after periods of prolonged drought. During the long dry seasons ("off-season"), the population densities are very low and no outbreaks are seen.
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 Mediterranean flour moth or mill moth is a moth of the family Pyralidae. It is a common pest of cereal grains, especially flour. This moth is found throughout the world, especially in countries with temperate climates. It prefers warm temperatures for more rapid development, but it can survive a wide range of temperatures.
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.
The leek moth or onion leaf miner is a species of moth of family Acrolepiidae and the genus Acrolepiopsis. The species is native to Europe and Siberia, but is also found in North America, where it is an invasive species. While it was initially recorded in Hawaii, this was actually a misidentification of Acrolepiopsis sapporensis.
Epargyreus clarus, the silver-spotted skipper, is a butterfly of the family Hesperiidae. It is claimed to be the most recognized skipper in North America. E. clarus occurs in fields, gardens, and at forest edges and ranges from southern Canada throughout most of the United States to northern Mexico, but is absent in the Great Basin and western Texas.
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.
The fall armyworm is a species in the order Lepidoptera and one of the species of the fall armyworm moths distinguished by their larval life stage. 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 consistently practice cannibalism, despite its fitness costs.
Archips semiferanus is a species of moth in the family Tortricidae, and one of several species of moth commonly known as oak leafroller or oak leaf roller. The larvae feed on the leaves of oak trees in the eastern United States and southeastern Canada and are a major defoliator of oak trees, which can lead to tree mortality. In Pennsylvania in the late 1960s and early 1970s, oak leafrollers defoliated over 1,045,000 acres (423,000 ha).
Spilosoma obliqua, the jute hairy caterpillar or Bihar hairy caterpillar, is a moth of the family Erebidae. It is found in south-eastern Afghanistan, northern Pakistan, India, Bhutan, Bangladesh and Myanmar.
Parapoynx stagnalis, the rice case bearer or rice caseworm, is a species of moth in the family Crambidae. It has a wide distribution and is found in India, Sri Lanka, South-East Asia, South Africa, South America, southern Europe, Russia and Australia.
The Coconut black headed caterpillar, is a species of moth found in throughout East Asian countries including Bangladesh, India, Sri Lanka, Myanmar, as well as Indonesia. It is considered a pest of coconut palm trees, causing considerable damage to the trees, and reducing the plant's yield significantly and can be a major problem where coconuts contribute to the economy. The species exists on coconut palms through its life stages 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.
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.
Mahasena corbetti, the coconut case caterpillar, is a polyphagous species of bagworm. This species is classified as leaf-eating pest caterpillars that produce tough silk out of their bags from dried foliage. Currently, M. corbetti is considered a 'pest of quarantine importance' in multiple countries and is included on the list of dangerous pests in the Malaysian plant quarantine act.