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close this bookVector and Pest Control in Refugee Situations (United Nations High Commission for Refugee, 1997, 124 p.)
View the document(introduction...)
View the documentPreface
View the document1. Introduction
View the document2. Factors influencing the spread of vectors in refugee camps
View the document3. Arthropods of medical importance
Open this folder and view contents4. Mosquitos
Open this folder and view contents5. Non-biting flies
Open this folder and view contents6. Lice
Open this folder and view contents7. Fleas
Open this folder and view contents8. Bed bugs
Open this folder and view contents9. Human scabies mites
Open this folder and view contents10. Ticks
Open this folder and view contents11. Other arthropods of medical importance
Open this folder and view contents12. Snails hosts of schistosomes
Open this folder and view contents13. Commensal rodents
Open this folder and view contents14. Organisation of a control programme
Open this folder and view contents15. Pesticides
Open this folder and view contents16. Safe use of insecticides
View the documentGlossary
View the documentBibliographic selection
View the documentAnnex 1. Some arthropods and their importance to health
View the documentAnnex 2. Morphological characteristics of some arthropods of medical importance
View the documentAnnex 3. Reporting form for spraying operations
View the documentAnnex 4. Calculation of the quantity of solution and insecticide for use in treatments
View the documentAnnex 5. Determination of the insecticide concentration for use in a sprayer
View the documentAnnex 6. Preparation of a solution from an insecticide formulation
View the documentAnnex 7. Preparation of a solution from an emulsifiable concentrate
View the documentAnnex 8. Calculation of the quantity and dilution of insecticide for use in impregnation of fabrics
View the documentAnnex 9. Calculation of the quantity of molluscicide for use in a waterway
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Annex 5. Determination of the insecticide concentration for use in a sprayer

When calculating the optimum concentration of active ingredient (a.i.) in the insecticide solution to be used in a spraying treatment, the following factors should be considered:

· quantity of a.i. per m2 to be applied;
· throughput speed of the pump (nozzle type and tank pressure);
· speed and method of spraying (see section 14.3.)

Example:

In order to determine the insecticide concentration for pirimiphos-methyl 50 CE treatment to be applied using a sprayer, the following points have to be considered:

· surfaces must be treated with 1 g of insecticide a.i. per m2;
· spraying speed must be regulated to spread 40 ml solution per m2;
· the formulation contains 50% of a.i.;
· so for 40 ml to contain 1 g of a.i., a litre of solution will have to contain 25 g, giving a 2.5% a.i. concentration.

Example:

In order to determine the insecticide concentration for deltamethrin 2.5 WP treatment to be applied using a sprayer, the following points have to be considered:

· the surfaces must be treated with 0.025 g of insecticide a.i. per m2;
· spraying speed must be regulated to spread 40 ml solution per m2;
· the insecticide comes in a 2.5% concentrate formulation;
· so in order that 40 ml contain 0.025 g of a.i., a litre of solution will have to contain 0.625 g, giving a 0.0625% a.i. concentration.