Dear Amir - You can also find several effective systemic acaricides, but the problem is that they might be too toxic when applied to an animal host!
Best wishes - Lara
Thank you so much dear lara - my mean is insecticides and miticides on agricultural products...
Hello Amir,
I think the main difference is in the cuticle morphology of mites.
Plese have a look at those articles:
Chapter Factors Affecting Penetration of Compounds Through the Cutic...
https://www.eje.cz/pdfs/eje/2005/01/12.pdf
Because evolution is gradual in the development stage, which are the organisms that keep the vegetarian host in all its stages to feed on the plant juice so its presence is known so use pesticides that affect contact
insecticides have effective action when orally taken as insect cuticle provide resistant to penetration of insecticides, while acaricides act most on the cuticle of mites as having their cuticle have little resistance for penetration of acaricides.
The mode of action of the two categories of pesticides depend on their chemical nature and the difference in chemical composition and structure of the cuticles of insects and mites.
May be because mite are found feeding on the surface of leaves and have limited mobility.
Tesfay
Systemic insecticides are used again sucking insects (e.g. aphids, thrips, leafhoppers). These insects suck juices from phloem through their specially shaped mouth organs. They will not be damaged by contact insecticides while they are quite susceptible to systemic ones. On the contrary most mites feed rather from surface or the mesophyll cells. Therefore systemic acaricides would not really touch them. So simply you do not need systemic action against mites.
Thanks to everyone for their answers, In addition to your comments, I think because the cuticle of the mites is thinner than the cuticle of the insects, eventually the contact toxins will be affected more quickly.
Hi
It is depend on. Also active type insects and mites are different from each other on plants
The Best Regards
Samaneh Mahmoudvand
Probably, because salivary enzymes of mites cause damage to plant cells and make mechanical damage.
The Best Regards
S.Mahmoudvand
often times insecticides are systemic in the sense that the active ingredients or concentration is penetrable to the phloem and xylem parts of the plant that the intention is to target those insects which are plant sucking insects. In the case of acaricide is contact because the active ingredients of the toxic substance is specific to the ticks or mites and is not penetrable to the skin of the hosts like dogs or cows which has low mammalian toxicity. The effect of acaricide is specific to the ticks skin and not for the hosts. I hope this is ok.
I think it depends, but usually related to mouth parts of them and exoskeleton.
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