It can decrease the production of photosynthesis depending on which pesticide you use.
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In the marine environment, phytoplankton (photosynthetic organisms) display some of the greatest primary productivity of any chloroxygenic organism on earth. Pesticides, typically used I terrestrial environments can often spill into the marine environment via eutrophication and other run-off processes. This can have deleterious effects for some species; inducing oxidative stress resulting in the death of the organism. Alternatively, some species may thrive on the input of pesticides - they often contain nitrogen-rich compounds, which photosynthetic organisms use in the biosynthesis of amino acids and proteins.