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Minute small flies - Thrips - cause streaky
marks on flowers and foliage. they suck at the leaf or flower in order
to obtain the sap within. The marks are usually a silvery colour and are
pronounced on Gladiolus flowers in particular. Very small insects - just
visible - and are more active in hot dry weather.
Not a huge pest - unless you are going to 'show' your
gladiolus blooms! Contact spray such as Bifenthrin will work as will the
systemic insecticide Provado.
Also known as Thunder flies, Storm Flies and Corn
Lice.
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