Many essential oils are mosquito repellents. Lemongrass and Citronella are the most commonly used in natural bug sprays, but most lemon-scented essential oils are insecticides. Other good options include Eucalyptus and Lavender.
The segments of the body are organized into three distinctive but interconnected units, or tagmata: The thorax is made up of three segments: Each thoracic segment supports one pair of legs. The meso- and metathoracic segments may each have a pair of wingsdepending on the insect.
The abdomen consists of eleven segments, though in a few species of insects, these segments may be fused together or reduced in size. The abdomen also contains most of the digestiverespiratoryexcretory and reproductive internal structures. Segmentation[ edit ] The head is enclosed in a hard, heavily sclerotized, unsegmented, exoskeletal head capsule, or epicraniumwhich contains most of the sensing organs, including the antennae, ocellus or eyes, and the mouthparts.
Of all the insect orders, Orthoptera displays the most features found in other insects, including the sutures and sclerites. In prognathous insects, the vertex is not found between the compound eyes, but rather, where the ocelli are normally.
In some species, this region is modified and assumes a different name. The anterior segment, closest to the head, is the prothorax, with the major features being the first pair of legs and the pronotum. The middle segment is the mesothorax, with the major features being the second pair of legs and the anterior wings.
The third and most posterior segment, abutting the abdomen, is the metathorax, which features the third pair of legs and the posterior wings. Each segment is dilineated by an intersegmental suture. Each segment has four basic regions.
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The dorsal surface is called the tergum or notum to distinguish it from the abdominal terga. In turn, the notum of the prothorax is called the pronotum, the notum for the mesothorax is called the mesonotum and the notum for the metathorax is called the metanotum.
Continuing with this logic, the mesopleura and metapleura, as well as the mesosternum and metasternum, are used. Each segment of the abdomen is represented by a sclerotized tergum and sternum. Terga are separated from each other and from the adjacent sterna or pleura by membranes. Spiracles are located in the pleural area.
Variation of this ground plan includes the fusion of terga or terga and sterna to form continuous dorsal or ventral shields or a conical tube.
Some insects bear a sclerite in the pleural area called a laterotergite. Ventral sclerites are sometimes called laterosternites. During the embryonic stage of many insects and the postembryonic stage of primitive insects, 11 abdominal segments are present.
In modern insects there is a tendency toward reduction in the number of the abdominal segments, but the primitive number of 11 is maintained during embryogenesis. Variation in abdominal segment number is considerable. If the Apterygota are considered to be indicative of the ground plan for pterygotes, confusion reigns: The orthopteran family Acrididae has 11 segments, and a fossil specimen of Zoraptera has a segmented abdomen.
The procuticle is chitinous and much thicker than the epicuticle and has two layers: The tough and flexible endocuticle is built from numerous layers of fibrous chitin and proteins, criss-crossing each other in a sandwich pattern, while the exocuticle is rigid and hardened.
Insects are the only invertebrates to have developed active flight capability, and this has played an important role in their success.
Having their muscles attached to their exoskeletons is more efficient and allows more muscle connections; crustaceans also use the same method, though all spiders use hydraulic pressure to extend their legs, a system inherited from their pre-arthropod ancestors.
Unlike insects, though, most aquatic crustaceans are biomineralized with calcium carbonate extracted from the water. The head capsule is made up of six fused segments, each with either a pair of gangliaor a cluster of nerve cells outside of the brain.
The first three pairs of ganglia are fused into the brain, while the three following pairs are fused into a structure of three pairs of ganglia under the insect's esophaguscalled the subesophageal ganglion.
This arrangement is also seen in the abdomen but only in the first eight segments.NatureMax Mosquito Sticks, Insect Repellent Incense Stick, % Natural and DEET Free, Bamboo Infused with Citronella, Lemongrass (40 Sticks with Incense Holder).
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There are many essential oils, known for being excellent natural insect iridis-photo-restoration.com are just some of them: Citronella, Clove, Lemongrass, Lemon Eucalyptus. Companies can apply to use the voluntary new graphic on product labels of skin-applied insect repellents. This graphic is intended to help consumers easily identify the protection time for mosquitoes and ticks and select appropriately.