Biological controlPresent to

AJ.Worachat

Karnravee Jitvilai 09 Kewalin Ruengwattanachot 10

Natcha Chotnoparatpat 14 Nattagron Anop Na Ayootaya 15

Muthita Kanwerayothin 21 Warodom Techasrisutee 23

Biological control is a component of an integrated pest management strategy. It is defined as the reduction of pest populations by natural enemies and typically involves an active human role. Keep in mind that all insect species are also suppressed by naturally occurring organisms and environmental factors, with no human input.

Biological control

The behaviors and life cycles of natural enemies can be relatively simple or extraordinarily complex, and not all natural enemies of insects are beneficial to crop production.

This is frequently referred to as natural control. This guide emphasizes the biological control of insects but biological control of weeds and plant diseases is also included.

As usual, the growth is fairy slow at first. Then, it speeds up and reach carrying capacity, a maximum number of a species, to becomes stabilize.

Biology

control

Natural selection

Human technology

Natural selection Population growth becomes balanced by limiting factors or restrict that limit the number of populations such as available food, water, shelters, etc. Also, pollution and natural disasters has played roles in modifying number of population in an area.

Human intervention also takes a big part of population changes such as global warming which is from the pollution causes by human, affects on melting glacier and polar bears’ population and deforestation decrease living space of animals.

Human technology

What Causes Population Growth? In the 1800s, there was approximately one billion people in the world. As of 2009, the world population has reached nearly seven billion. This increase in population growth is attributed to factors that increase fertility and reduce death

Health Care Advances in health care technology and medicine allow fewer individuals to die from injuries and illnesses. Health care is so effective that euthanasia and the Hippocratic Oath are sometimes debated.

Sanitation Better sanitation has lead to fewer diseases being spread through water and contaminated surfaces.

Vaccines Vaccines have lead to the elimination of many diseases such as measles and tuberculosis. Measles and tuberculosis were once leading causes of death.

Standard of Living and Fertility Standard of living has a complicated effect on population growth. Areas with low standards of living have high birth rates, but also have high infant mortality rates. As the standard of living increases, better medical care leads to lower infant mortality rates and fertility medications increase a woman's chance for pregnancy. But statistically, societies with high standards of living tend to stabilize and eventually decline.

“Biological pest control”

Pest control by using pesticides can causes pollution and resistance of pests which develops after the pests escape from the death and becomes stronger than others. The pests have immune to survive from the same pesticide. And it has a large percentage of the offspring to be able to withstand the pesticide.

“ How does it works? ”

Biological control is a method of controlling pest using other living organisms, relying on predation, parasitism or competition relationship, but typically also involves an active human management role. There are three basic types of biological pest control ; importation (sometimes called classical biological control), augmentation and conservation.Natural enemies of insect pests, also known as biological control agents, include predators, parasitoids, and pathogens.

How does it works? Many weed species survive from year to year by producing seeds. Fungi or insects that attack seeds can reduce the number of weed seeds stored in the soil, which in turn can reduce the size of future weed populations. This lowers the effort needed to control the remaining emerging weeds.

Biological weed control

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What is biological control of weeds? Biological weed control involves using living organisms, such as insects, bacteria, or fungi, to reduce weed populations. In nature, plants are controlled biologically by naturally occurring organisms. Plants become pests - and are labeled "weeds" - when they run rampant because their natural enemies become ineffective or are nonexistent. The natural cycle may be interrupted when a plant is introduced into a new environment.

Advantages DisadvantagesFeed on the target organism It takes risk in affecting their target

organism but they have a risk to feed on beneficial organism because they prefer it over pest, make the program unaffective.

Leaving non-pest organisms undisturbed

The process is inexpensive once they are established, but laying groundwork may be costly.

Inexpensive compare to other control methods

Long time

Require little human effort, biological agents spread on their own

not all pest can be controlled.

Beneficial animals and plants in an area are unaffected by this method of control.

pest may be so similar to a native or beneficial plant or insect that the risk of introducing the control agent outweighs any benefits.biological control does not eliminate the entire pest population.

Question2 : What is disadvantage of biological

control

Question1: What is the method of

biological weed control

Question3 : What is the population growth effect of

human technology

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