Many calling the advisory line have been seeking advice on fusarium patches and scarid fly.
Bayer Garden consumer advisor Anita Dent said: "As the spring weather picks up, people are revisiting their gardens to see what they have to do to get them in order and they are spotting large brown patches in their lawn.
"Fusarium, or snow mould, thrives under the snow, where it is insulated from the cold; it leaves large, unsightly brown patches."
On scarid fly, which has been reported on house plants, she said: "It does not cause any damage, but it’s not pleasant to have scarid flies in your house, hovering around your house plants.
"You tend to notice them if you disturb the plant – they fly a little way off and return when the plant is left alone again."
She said advisors were recommending the use of Bayer’s Lawn Disease Control for the treatment of fusarium and Provado Ultimate But Killer for treating scarid fly.