| Abstract: | The value of an analytical approach to the assessment of the advantages resulting from the use of controlled release granular formulations of pesticides is discussed. The methods are illustrated by considering the concentration-time profiles resulting from the application of such formulations to water and to soils. The importance of the particular environment in which these formulations are used and of the dynamic nature of the pest population is emphasised. It is concluded that relatively simple controlled release granular formulations could give improvements in the performance of pesticides compared with conventional formulations but that the practicality of producing such formulations with a sufficiently large range of release rate constants is uncertain. Equally their use under field conditions might be subject to practical difficulties. |
