Question

Ladybird beetle with red and black marking control:
1. Mosquitoes
2.Alphids
3.Weeds
4.Ants​

Answer 1

Answer:

The correct answer would be Aphids.

Answer 2

Answer:

Ladybird beetle with red and black marking control Aphids (OPTION 2).

Explanation:

What are biocontrol agents?

This is a technique of using biological plants and animals to control pests and plant diseases in the crop field and increase yield.

What is the advantage of biocontrol over chemical insecticides and pesticides?

The pesticides and insecticides of chemical origin are very toxic to our health and they cause soil and water pollution if used excessively. Most of these chemicals accumulate with time and their concentrations also accumulate in the tissues of the animals which consume them, which leads to serious diseases.

The biocontrol technique, on the other hand, is an organic farming approach to dealing with the pests and plant diseases occurring in the field. The modern ideas believe that the biodiversity in a field must be maintained for maintaining the stability of the environment. This technique eliminates the idea of killing pests and the fact that this eradication may also destroy the vital host-predator and parasitic interactions which are helpful for our sustainability.

                      Thus, biocontrol agents help us to reduce our dependence upon chemicals for controlling pests and plant diseases. One must have a sound knowledge of the various life forms that inhabit the field, i.e., the predators, the pests, their hosts, and their patterns of feeding, for applying effective means of biocontrol.

Examples of biocontrol agents:

Some popular examples of biocontrol agents are:

1. Ladybird beetles with red and black markings are used to control aphids in the field.
2. Dragonflies are used to control mosquitos.
3. Bacillus thuringiensis is a bacterium which is used to control butterfly caterpillars.
4. Trichoderma is a fungus that is used to defend itself from certain plant pathogens in the field.
5. Baculoviruses are a popular class of viruses used to attack insects and other arthropods. (majority of the baculoviruses fall under the genus Nucleopolyhedrovirus (NPV))

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