ThripsFebruary 7, 2017
Also known as “thunder-flies”, very small (1.5mm) insects, black with narrow hairy wings. They feed on plant sap and on humid summer days they may occur in huge numbers on window sills and getting into clothing and hair.
An agricultural pest, they are only a nuisance in domestic premises. They have been known to trigger fire alarms by collecting in large numbers inside smoke detectors.