Minister for the Environment and Water Resources Masagos Zulkifli gave three valid reasons in Parliament for not conducting fogging indiscriminately in many parts of Singapore ("Not wise to do routine fogging outside clusters: Minister"; Sept 14).

There seem to be fewer grasshoppers and butterflies in fields and other grassy areas these days.

Could indiscriminate fogging be the cause of the diminishing number of insects?

This is another reason for limiting the use of fogging chemicals which also inflict collateral damage on useful living things.

Tan Chee Teik