Introduction:
Insects are extremely abundant and have been named the most successful animal species in terms of numbers. In this chapter, we will be studying the different economic classes of insects with subgroups and illustrations in each category, the biology of a main economically significant insect, the honey bee. It is a beneficial insect as the honey derived from it is consumed through man and employed for other purposes like in medicine.
Economic Classification of Insects:
Insects are a much significant group of animals because of their advantageous and unfavorable effects on the life of man. They have form a tremendous impact on the environment, on human health and activities. Medical, economic and agricultural Entomology are significant branches of science.
Insects can be categorized as follows based on their economic significance.
1) Injurious Insects:
a) Pests of cultivated plants (crop pests): Each and every cultivated plant harbors lots of insect pests that feed on them and decrease the yield of the crop. Field and horticultural crops are attacked by most of the insect species. Example: cotton bollworm and Rice stem bores.
b) Storage pests: These are the insects which feed on the stored products and cause financial loss. Example: Rice weevil and Pulse beetle.
c) Pest attacking cattle and domestic animals: Cattle are influenced by pests such as Fleshfly, Horse fly, Fleas and Lice. They suck blood and at times eat the flesh.
2) Beneficial Insects:
a) Productive insects:
b) Insects helpful as drugs, food and ornaments:
c) Ornaments, entertainers:
d) Scientific research:
Mosquitoes and Drosophila are helpful in genetic and toxicological studies correspondingly.
3) Helpful Insects:
a) Parasites: These kinds of insects are small insects that feed and live on harmful insects by finishing their life-cycle in a host and kill the host insect. Example: egg, larval and pupal parasitoids.
b) Predators: Such insects are the big insects that capture and devour harmful insects. Example: Coccimellids and Preying matritids.
c) Pollinators: Most of the cross-pollinated plants based on insects for pollination and fruit set. Example: Honey bees, help in pollination of the sunflower crop.
d) Weed killers: Insects that feed on the weeds and kill them. Example: Parthenium beetle eats on parthenium.
e) Soil builders: Soil insects like beetles, ants, larva of cutworms, crickets and collembola make tunnels in soil and facilitate aeration in the soil. They become fine manure after death and enrich the soil.
f) Scavengers: These are the insects which feed on dead and decaying matter is termed as scavengers. They are significant for maintaining the hygiene in the surroundings. Example: Carrion beetles and Rove beetles feed on the dead animals and plants.
4) Household and Disease Carrying Insects:
a) Pests that cause damage to possessions of human beings such as paper, furniture, wool and so on. Example: Furniture beetle, cockroaches, sliver fish and so on.
b) Pests that cause painful bite, inject venoms. Example: Wasps and bees sting us. Hairy caterpillar nettling hairs are poisonous. Mosquitoes and bugs bite and suck blood from us.
c) Disease-causing: Mosquito causes Malaria; Filariasis causes Dengue fever; Housefly causes Typhoid, Anthrax and Cholera.
Biology of Major Economically Important Insects:
Characteristics of Insects:
1) Insects such as other mandibulates contain one pair of pre-oral antenniform appendages.
2) The insect body is generally categorized into three portions: head, thorax and abdomen.
3) The insect head comprises of six parts bearing a pair of antennae (segment 2), a pair of mandibles (segments 4), first maxillae (segment 5) and a pair of second maxillae (segment 6). Compound eyes are present.
4) The thorax includes of 3 segments and bears 3 pairs of walking legs ventrally and 2 pairs of wings dorsally.
5) The abdomen comprises of 11 segments generally and bears no ambulatory appendages.
6) Insects respire through trachea that opens through segmentally arranged spiracles.
7) Excretion in insects is through Malpighian tubules.
Biology of a Honey Bee (Apis):
There are an around 30,000 bee species globally. The vast mass of such species are solitary and don't produce honey or big nests with young, and thus don't show colony defense.
If one usually thinks of a bee, the species that in general comes to mind is the western honeybee, Apis mellifera. The genus Apis is composed of eight species. Apis mellifera is composed of 24 various races. The most general commercial production race is Apis mellifera ligustica, generally termed to as Italians. This race is acknowledged for its high rate of honey production and its gentle nature, making it a preferred in apiaries and in commercial bee production facilities.
The majority of bees which one notices outside of a hive are workers (that is, sterile females). A characteristic honeybee colony comprises of 50,000 to 60,000 sterile workers, 500 to 1000 drones (that is, fertile males) and one queen, the mere fertile female in the colony and mother of the whole population of the hive.
Several people perplex bees with wasps. Bees tend to be vegetarians and are usually hairy, while wasps are likely to be carnivorous and hairless.
Life cycle of a Honey Bee (Apis):
Honey bee life-cycle consists of four main different phases or stages: egg, larva, pupa and at last an adult. Honey bee colonies are usually perennial by the exceptions of bumble bee and paper wasp colonies. The colonies of bees comprise of three castes, Queen Bee, worker bee and drones (that is, males). Queen bees lay eggs, worker bees are non-egg producing bees and drones are inevitable for mating purposes.
Developmental time for honey bees:
The total growth or developmental time for a Queen bee is around 16 days, 21 days for worker bee and around 24 days for male or drone bee. Four different honey bee life cycle phases can be described in short as follows:
1) Egg stage:
Primary phase or stage of development in the life-cycle is egg stage. Eggs are much minute and have look of poppy seeds in shape. Each and every egg consists of an opening on the wider side which enables a sperm to penetrate in. Hatching of eggs generally takes place after three days of egg laying.
2) Larva stage:
This phase or stage usually lasts up to nine odd days. Throughout this phase, hatched larva is nearly microscopic in size devoid of legs and eyes. Larva is nourished on a diet termed as royal jelly for initial two days. As the third day steps forward larvae which are destined to build up into queen bees carry on to fed on royal jelly, whereas worker larvae feed on the honey, water and pollens. Larval phase for queen bee lasts for 5.5 days, 6 days for worker bees and 6.5 days for the drones.
3) Pupa stage:
Reformation of tissues massively occurs throughout the pupal phase. Worm-like body consists of now three different parts of the body. This phase generally lasts for 7.5 days for queen bee, 12 days for worker bee and 14.5 days for drone bee (that is, male bee).
4) Adult Stage:
All three kinds of bees are now completely grown and are totally ready to achieve their tasks. A characteristic colony of honey bee comprises of 50,000 to 60,000 worker bees, 600 to 1000 drone bees and just 1 queen bee.
Tutorsglobe: A way to secure high grade in your curriculum (Online Tutoring)
Expand your confidence, grow study skills and improve your grades.
Since 2009, Tutorsglobe has proactively helped millions of students to get better grades in school, college or university and score well in competitive tests with live, one-on-one online tutoring.
Using an advanced developed tutoring system providing little or no wait time, the students are connected on-demand with a tutor at www.tutorsglobe.com. Students work one-on-one, in real-time with a tutor, communicating and studying using a virtual whiteboard technology. Scientific and mathematical notation, symbols, geometric figures, graphing and freehand drawing can be rendered quickly and easily in the advanced whiteboard.
Free to know our price and packages for online biology tutoring. Chat with us or submit request at [email protected]
For Statement-Assignment help, homework help including the key concepts of Functions and Comments.
Theory and lecture notes of Balanced-Growth path all along with the key concepts of the balanced-growth path, theory of economic growth, estimating balanced-growth path, homework help and assignment help. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Balanced-Growth path.
Boolean algebra and Flip Flops tutorial all along with the key concepts of Logic gates, AND Gate, OR Gate, NOT Gate, Combination of Logic Gates, NAND Gate, NOR gate, Boolean algebra, Boolean Theorems
tutorsglobe.com head or capitulum assignment help-homework help by online main axis flattened tutors
Steps of activity based costing - The costing system that is already existing should be capable to adopt the activity based costing system that is why product costs can be precisely determined and correct pricing decisions can be taken in a competitive business environment.
elements of group 17 tutorial all along with the key concepts of occurrence, extraction and uses of group 17, preparation of fluorine, physical properties of group 17, oxidation states and oxidation power
what is international trade? define some of basis of international trade, www.tutorsglobe.com offers theory and concepts of international trade, assignment help - international trade homework help.
Cell and its constituent organelles tutorial all along with the key concepts of cytoplasm, Nucleus, Chromatin, Nuclear Pore Complexes, Import into the nucleus, Export from the nucleus, Mitochondria and Chloroplasts, Golgi apparatus, Endoplasmic reticulum, Protoplasm, Cytoplasm
sex linkages tutorial all along with the key concepts of barr body, y-linkage, sex - limited traits, sex - influenced genes and chromosomal sex determination
tutorsglobe.com division of labor and market assignment help-homework help by online labor tutors
tutorsglobe.com properties of gold assignment help-homework help by online occurrence and principles of extraction of gold tutors
Orbital Hybridisation tutorial all along with the key concepts of Sp3-Hybridisation, Sp2-hybridisation, Sp-Hybridization
accounting is regarded along with communicating, analysing and collecting financial information. the reason is to assist people who use this information to make more right decisions.
www.tutorsglobe.com offers Object Diagrams homework help, assignment help, case study, writing homework help, online tutoring assistance by computer science tutors.
www.tutorsglobe.com offers Cost of Defective Work homework help, assignment help, case study, writing homework help, online tutoring assistance by accounting tutors.
1963142
Questions Asked
3689
Tutors
1488603
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!