Grain stores catalogue

Insecticide-treated polypropylene sacks

Storage Period: 3-12 months
Minimum Capacity: 50kg
Maximum Capacity: 100kg
Minimum Lifespan: 1 year
Maximum Lifespan: 2 year
Minimum Initial Cost: 60 US$ for 1 tonne
Maximum Initial Cost: 80 US$ for 1 tonne
Minimum Cost per Tonne per Year: 40 US$ per tonne per year
Maximum Cost per Tonne per Year: 53 US$ per tonne per year
Pest Control Status: Initial disinfestation required before storage

Open weave polypropylene bags are available with insecticide incorporated into the material. Insects attempting to enter the bags will be killed on contact with this treatment. After filling, the necks of the bags are sewn shut by hand or with a stitching machine. They should be kept inside a house or grain store, away from walls and separated from the floor by palleting.


Maize, rice, wheat, millet, sorghum, beans, groundnuts, cowpeas, soya (according to manufacturer)

Maize and sorghum (Zimbabwe & Tanzania)

Rice, millet, beans, cowpeas and pigeon peas (Tanzania)

Materials: Polypropylene and deltamethrin
Locations made: Vietnam, Vestergaard Group S.A
Life span: Manufacturer says 2 years but independent evidence is lacking. The 2 year estimate is based on active life of insecticide but this may be lower in the case of poor handling and, possibly also, unfavourable climate.
After uses: Probably as an ordinary bag for grain storage
Marketing and promotions: In several states of Nigeria and in Ghana through government food security programmes.
Marketing success: Too early to judge
Marketing training: The distribution channels have been trained on the appropriate way of using the technology to ensure that only non-infested grains are stored in the bags. Demonstrations were done to show the powerful killing action which occurs when insect pests touch the sides of the bags.
Degree of adoption:

This a new product which has completed registration in several West African countries where marketing has started. Registration is on-going in other countries, and the product roll out will start this year (2015).

Reason for adoption: Powerful killing action on those insects that touch the walls of the bag
  1. The treated polypropylene kills insects attempting to enter the bag. It does not kill all insects that are within the grain at the time of loading, i.e. the bags are only suitbale for the protection of grain that is already free of insects at the time of loading.
  2. If storage is to be for more than three months then it is advisable to load bags with grain that has been fumigated or to fumiagte soon after loading.  This is not a feasible for smallholders.
Barriers to adoption:
  1. Registration constraint: in some countries, registration takes a long time due to the insecticide incorporated in the bag
  2. Costs currently appear to be expensive in test countries, these may reduce once the product becomes available commercially
Overcoming barriers: No comment yet
Institutional use: Producer views the ZeroFly bags as ideal for large warehouses (state and private), institutions, seed companies and even relief organisations. Can be stacked in warehouse in more than 20 layers due to strength and anti-slip properties
  1. Insects killed on contact with the bag
  2. Grain can be consumed exactly when required
  3. Bags can be reused
  4. No handling of pesticide
  5. Grain consumed is free of pesticide.
  6. The concept of pesticide incorporated polypropylene bags is trusted since the same principle is used with impregnated mosquito nets (made by the same company).
  1. Grain must be insect-free when loaded into the bags
Storage ID: 3
Additional technical information: Additional Info
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