Chatting about agricultural adjuvants

Due to work reasons, I have also done research on plant essential oils for several years.

There are many types of plant essential oils on the market, the most common is orange peel essential oil. Some netizens asked, why is it?

I think the reasons are as follows:

1. The raw materials are cheap (juice factory waste residue extract).

2. Contains some hydroxy acids, which can have a bit of chelation and penetration.

3. Limonene has a softening effect on the piercing-sucking needles of some pests (affecting feeding).

In fact, there are many types of plant essential oils, which are very ancient. Rotenone, nicotine, azadirachtin, capsaicin, etc. are all plant essential oils. Compared with them, orange peel essential oil has poor insecticidal activity, but its penetration and chelating properties are still quite good. However, please note that the most primitive structure of D-limonene has been registered as a pesticide. Except for companies that have obtained the registration certificate, anyone whose products contain this ingredient will be regarded as a pesticide in the future and will be punished as a fake pesticide. Depends on the value.

There is also a class of derivatives of plant essential oils, mainly surfactants. For example: methyl oleate, such as coco amine, such as piperonyl butoxide, etc. These substances are mainly activities such as extension, penetration, and fat-dissolving.

Adding these things as adjuvants can improve the utilization rate of pesticides and fertilizers. Improve the activity of pesticides and delay the occurrence of pest resistance.

The most widely used varieties of agricultural adjuvants are agricultural emulsifiers, penetrants, film formers, wax dissolving agents, dispersants, wetting agents and so on. The composition structure includes silicon group, bromine group, fluorine group, ether group and so on.

No adjuvant is omnipotent. Some people use penetrant plus azoxystrobin to cause phytotoxicity, and some people use azoxystrobin plus spirotetramat to cause phytotoxicity. The surface of the young leaf stage and the young fruit stage lacks the protection of the waxy layer, and the risk of phytotoxicity increases when two or three highly penetrating ingredients are mixed.

Some products have already added a lot of penetrants, and additional tank-mixed penetrants are not necessary; it also increases the risk of phytotoxicity. So penetration is a double-edged sword, don't blindly take the penetration of your own products as a selling point.

There was once a high content of abamectin that caused phytotoxicity when used at high temperature in the corn seedling stage. Later I suggested removing the penetrant from the product and adding more antioxidants. The insecticidal effect is not affected, the duration of validity is also longer, and there is no phytotoxicity.

Cyanogen bromide and trifluoride in pyrethroid products are relatively permeable. Biphenyl has 3 more carbons and 1 oxygen (benzene ring), which has a slow-release effect, weak permeability, and a long lasting effect. Therefore, the contact killing effect of biphenyl is weaker, but the stomach poisoning effect is enhanced.

File-sucking and chewing mouthparts pests are better to deal with stomach poisoning, so biphenyl is better than kungfu pyrethroid in the control of thrips.

The delisting of highly toxic pesticides and the supervision of the hidden ingredients of pesticides have resulted in the inability of existing products to solve the problem of pest and disease resistance, which has brought market opportunities to tank-mixing additives. However, it is not always possible to add penetrants. The application of hypertonic tank-mixing additives is a bit messy, and phytotoxicity often occurs.

Digression: microencapsulated suspension-suspoemulsion, microencapsulated suspension-suspension. This is an important direction for the development of dosage forms in the future and deserves attention.