Holgersen Pilegaard posted an update 1 year, 5 months ago
They aren’t not used to us. They commonly happen in our homes and are called household pests. They are cockroaches. They are present in all parts of the world with special mention of tropics. Several varieties of cockroaches have already been isolated from India. The most popular species are Periplaneta Americana and Blatta orientalis. They belong to the phylum Arthropoda and class Insecta. An order in which they are placed is Dictyoptera. They most commonly inhabit houses, restaurants, hotels, bakeries, food stores and in many cases railway compartments and ship holds.
Cockroaches are nocturnal insects which remain hidden through the daytime in cracks, holes or crevices of kitchens, godowns, hotels, public toilets, neglected bags, boxes along with other articles but come out in the dark as a way to acquire their nutrition. They are fast runners and run very quickly on being disturbed. Cockroaches also have their wings to fly as a way to get off their predators. Body colour ranges from brown to brownish black. Body’s dorsoventrally flattened measuring 3-5 cm in total. Mouth bears mandibulate type of mouth parts. Eyes are compound like other arthropods suited for mosaic vision having a single ocellus. Antennae bear around 100 segments and they are filiform healthy. Pronotum is characteristically large covering the dorsum of the head as being a hood. Forewings are somewhat thickened and therefore are designated as tegmina even though the hind wings are membranous and fan shaped. Legs are cursorial. Men’re recognized by a good some styli about the last abdominal segment referred to as sternum. Females bear decreased ovipositor on the seventh abdominal segment. External genitalia of male are asymmetrical in shape.
The breeding season for cockroaches is produced by March-September during which they remain very active. Copulation is accompanied by egg laying. Eggs are laid in bag like structures referred to as ootheca that happen to be deep brown in colour. Oothecae are marked by sculptured patterns where you can definite shape which is characteristic of a species. The amount of eggs within an ootheca is different from 15-40 arranged in double rows. Formation of ootheca takes a few days and frequently might be found attached to the substratum. Female lays around 100 oothecae in her own overall lifespan each containing 16 eggs. The hatching of eggs depends upon the humidity and temperature of the environment. They hatch after 35 days in summers but take 100 days in winter. The larval development is additionally influenced by the climatic conditions. Nymphs or perhaps the larvae grow into adults in Half a year in summers but can take Two years to get adults in winters. The roll-out of nymphs into adults is of hemimetabolous type and so they shed their cuticle during moulting. 10-13 moults are already notice within the life history of cockroaches. Under favourable conditions 2-3 generations occur in per year otherwise only a single generation is found.
Cockroaches are omnivorous and feed on a number of food materials. These are dirty, distasteful and odoriferous creatures and are attracted towards garbage, food stuffs consumed by humans. They enter any food material consume it, discolour and spot it with faecal material and then leave behind a foul smell. Also, they are known as transmitters of some diseases like tuberculosis, cholera, leprosy, dysentery and typhoid. Infestion of cockroaches in homes can be prevented by maintaining every one of the pipelines, safety tanks, tightly sealed. Food stuffs needs to be completely covered. Insecticides works extremely well in order to control them. Cockroaches could possibly be attracted perfectly into a eating place and then might be killed. Each of the crevices and cracks with the houses ought to be sealed.
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