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Monday, July 11, 2011

End of Insecticides Modes of Action

Today I will be touching on pyrethroid modes of action. Before I go any further, let me explain a bit of the history of pyrethroid chemicals. Pyrethroid chemicals which are widely used nowadays are originally came from the findings of chrysanthemum extract which is called pyrethrum. Pyrethrins are found at high concentration within flower structures which are located in the flowerhead of the Chrysanthemum. The extract from the Chrysanthemum plant containing pyrethrins is called pyrethrum.

Pyrethroid chemical which are in the insecticides industries are called synthetic pyrethroid, or man-made. Synthetic pyrethroid are classified in 2 types. Type 1 are classified with its ability to knockdown insects and Type 2 will induce higher insect mortality.

Pyrethroid modes of action, induce a toxic effect by acting at the sodium channel. They prevent sodium channel from closing, which causing the continual nerve impulse transmission which eventually leading to death.



The above photo illustrate pyrethroid chemical which bind with the sodium channel, as shown below: -




And this will prevent the channel from closing and causing the insect die from over impulse transmission.



The above photo showed the channel remaining open.

Well, that's the end of my post on Insecticides Modes of Action. Due to wide range of insecticides, there are still a lot more Insecticides which have different types modes of action. I will continue to write on this topic, as and when, my future post needs me to touch more on it.

If you missed the previous posts, please click the link below: -

1) First Step To Understand Insecticides Modes of Action
2) Insecticides Modes of Action - Part 1
3) Insecticides Modes of Action - Part 2
4) Insecticides Modes of Action - Part 3
5) Insecticides Modes of Action - Part 4








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