Diatomaceous Earths

QUESTIONS AND ANSWERS

The following are questions and responses from the Shinyanga Grain Storage Stakeholder Workshop (Nov 2002).

If you have any questions about the project please email them to Tanya Stathers (t.e.stathers@gre.ac.uk).

Q Mr Mikomangwa
What was the hypothesis of the Zimbabwean DE trials?

Has a cost benefit analysis been done for DE use in Zimbabwe?

Might not local geological conditions mean that local DEs could actually cost more than imported DE products?

How were farmers involved in Zimbabwe?

A Brighton Mvumi
The hypothesis was: DEs could effectively protect maize, sorghum and cowpeas from storage insect damage in small-scale on-farm storage situations in 3 agroecological zones in Zimbabwe.
A Tanya Stathers
As DEs are not yet commercially available in Zimbabwe, their estimated cost was based on calculations of their price at source, plus import duty and transport costs, the resulting figure was very similar to that of the price of Actellic Super dust needed to treat the same quantity. At intervals throughout the farmer-managed trials in Zimbabwe, farmers discussed and estimated the value of a 20 litre bucket of both their Protect-It and typically treated grain. The figures they gave suggested that by treating their grain with Protect-It® admixed at 0.1%w/w in comparison to their typical grain protection practice, a household, after five and seven months storage, would save US$20 and US$40 per tonne of shelled maize grain respectively or US$47 and US$54 per tonne of threshed sorghum grain respectively (as at DATE?).

Q Mr Lubengo

Why were the Shinyanga trials set up using infested grain?

A Mr Kitando
The trials aim to test DEs under realistic farmer conditions. Grain is frequently infested by storage pests whilst still in the field, prior to harvest and then farmers store this grain. The maize and sorghum grain was bought directly from farmers at the two sites and already showed low levels of infestation.

Q Mr Maige

What about the sustainability of the project - Protect-It is coming in from America - when will Tanzania be mining its own DEs?

How effective will local DEs be?

A Mr Kitando
We already have information regarding the location of some Tanzanian DE deposits, further facilitation is needed in order to mine them. During the second season's trials we plan to include local DEs in the trials.
A Mr Katua
Most synthetic pesticides are currently coming in from outside the country. Imports from Kenya say, might still be cost effective.
A Tanya Stathers
We feel this is one of the aspects of the project in which we need to start encouraging private sector involvement immediately.
A Brighton Mvumi
It must be clarified that we are not trying to sustain the project, but the livelihoods of the poor. It is very important to generate data that will convince the private sector that this is something that they should invest in.
A Mr Mussula
There is a need to discuss the project with and involve the private sector as stakeholders to help with sustaining the issues.

Q Mr Mikomangwa

The mining of local DEs will be the private sectors job, but as we don’t yet know how effective the local DEs are, it is premature to involve the private sector, only the Ministry of Agriculture and Food Security, the NGOs and the Geologists should be involved at this stage.

A Tanya Stathers
Historically it was believed to be unnecessary to involve farmers in research but current thinking now tries to involve farmers in the research process as early as possible. Shouldn’t we also involve the private sector as early as possible in this process, it can’t be harmful to raise awareness about this work amongst the private sector.

Q Mr Mfanga

All chemicals that are registered in Tanzania need to pass through the Tanzanian Pesticide and Registration Institute (TPRI). I’m not sure the private sector in Tanzania can take this forward, it is unlikely to happen here in the same way it is happening in Zimbabwe.

A Brighton Mvumi
We have already met with several representatives of agrochemical and seed companies in Arusha to discuss DEs and the project. They seemed very keen to learn more particularly with the phasing out of organo-phosphate pesticides which is gradually happening especially in developed countries. TPRI have said that the DEs will need to follow the normal application process for registration to be effected.

Q Omari

Can we clarify that these trials are being set up with comparisons of traditional treatments and Actellic Super dust so that farmers can compare these DEs to the products they normally use?

A Mr Kitandu
Yes, the trial has been set up with 7 treatments, these include the DEs Protect-It and Dryacide at different application rates, Actellic Super dust, traditional protectants (e.g. rice husk or fire ash admixed with grain) and an untreated control.

Q Mr Kolowa

Most farmers here in Shinyanga region use traditional vihenges or bags, shouldn’t the trial use storage structures similar to those used by most farmers, in case farmers then think that these DEs only work in improved storage structures.

A Mr Kitando
In Mlali village, Kongwa district, the DE trial has been set up using bags as this is how many farmers there typically store their grain.
A Tanya Stathers
It was at the previous meeting of Shinyanga post-harvest stakeholders last August when the proposal was being developed that the stakeholders decided to use a mini version of the modern/ improved vihenge design (with the lid, and outlet facility) to simultaneously increase farmers awareness of these alternative storage structures.
A Mr Katua
If we use the traditional vihenge design we will be taking our farmers backwards not forwards.

Updated: 21/3/03