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FAQ - Frequently Asked Questions

Can insects in all stages be controlled with phosphine releasing fumigants?
Yes, all stages will be controlled with phosphine. However, active stages such as adult insects or larvae will react more susceptible on phosphine and can be controlled easier.

What is most important when fumigating?
The three most important components are gastight volume, proper dosage and sufficient long exposure time.

Do I need a gasmask as a fumigator?
Yes, in any case! The gasmask has to be available when putting out the fumigants, in case of emergency as well as when removing the fumigations sheet.

Can I add water to the fumigant for speeding up the decomposition?
No, never! This is most dangerous and can lead to ignition!

Should I add tablets or pellets to processed food?
This is basically possible. However, powdery residues have to be removed completely from the commodity after the fumigation e. g. by aspiration.

Is fogging or spraying same like fumigating?
No, only fumigants like hydrogen phosphide can effectively penetrate the goods to be treated.

How long are the goods protected after fumigation?
There is no protection afterwards. A re-infestation by pests from outside is possible.

What can be fumigated?
In principle all agricultural stored products containing a maximum of 22 % humidity. In case of doubt please ask Detia Degesch.

Which precaution should be taken when applying phosphine?
Remember that phosphine reacts chemically with gold, silver, copper and their alloys (corrosion).

Who is allowed to apply phosphine fumigants?
Only well trained and experienced pest controllers with licence for phosphine application.

In case of urgency can I reduce the min. exposure time?
Any reduction endangers the success of fumigation.

Can I fumigate at a temperature less than 10 C?
Basically it should be avoided to fumigate below 10 C, since a control with full success cannot be granted on inactive stages like eggs and pupae. Should fumigation at these temperatures be necessary anyhow, magnesium phosphide fumigants should to be used. They are more potent than aluminium phosphide fumigants and decompose more quickly and more completely.

What about fumigation of sensitive commodities like herbs, spices, tea etc.?
These commodities can also be fumigated. In such cases it is advisable to use Degesch Plates or Degesch Strips. They only produce hydrogen phosphide and no ammonia, which is possibly undesirable in this application.

Fumigation of 20 and 40 container is quite common, which fumigant is recommended?
In container fumigation Degesch Plates are the product of choice. Degesch Plates are easy and safe in application, do quickly decompose and do not leave powdery residues.

When fumigating silo bins should I calculate the dosage by tons or by volume?
Basically one should calculate the dosage on bases of the volume. This grants that the dosage applies to the whole structure, although it might not be filled completely.