tips burning on 1st set of leave

kukku

Active Member
(outdoor grow).yesterday i've noticed white spots under some leaves(they left tiny holes) and 1 plant had the leaves deformed so I sprayed some chemical insecticide on top and under every leave.the white spots have gone but then today i've noticed that the tips of the first set of leaves are getting burned(2 out of 6 plants). it has been watered from rain collected into the well troughout the whole year. the medium its getting grown into is a mix of peat substrate (MIKSKAAR :: Makes Plants Grow), homemade compost and perlite. my first thought was the insecticide made this happen. what do you think?
 
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