I feel I must comment on this one.........

First of all I must empathise with you Lavenderblue as I would be jumping mad if it happened to me!
There has been some sound advice about contacting the council and finding out which chemical was used, it's application rate etc etc

What I don't agree with is the misguided assumption that all people, including council workers, who spray pesticides as one small part of there jobs are an inferior race and brainless!

Rant over!

Btw there are three main types of pesticide used :- sytemic,(glyphosate etc) kills the plant through it's system from leaf to root. Inert when it contacts soil.

Residual, forms a gaseous layer in the soil to kill seedlings as they emerge. (Sodium Chlorate, Simazine etc)

Contact, kills what it hits. (Paraquat etc)

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My Majesty made for him a garden anew in order
to present to him vegetables and all beautiful flowers.- Offerings of Thutmose III to Amon-Ra (1500 BCE)