What damage does dog or cat urine cause to plants?

What damage does dog or cat urine cause to plants?

• A. Salt Injury Resulting In Dead Spots And Browning.
• B. Fungal Leaf Spots With White Halos.
• C. Stem Cankers.
• D. Increased Growth Due To Nitrogen.

Answer: (A)

The main idea is that urine damages plants through salt injury. Dog and cat urine contains high concentrations of salts and nitrogen compounds (urea). When this urine sits on soil or plant tissue, the salts raise the soil’s salinity and create osmotic stress, making it harder for plant roots to take up water and for cells to function. This chemical burn shows up as dead spots and browning tissue, especially in lawns and around sensitive ornamentals. The other options don’t fit because fungal leaf spots with white halos are caused by a pathogen, not urine; stem cankers are also disease symptoms from pathogens or physical injury, not urine damage; and urine isn’t a reliable source of growth—its concentrated salts tend to burn tissue rather than promote healthy, increased growth.

The main idea is that urine damages plants through salt injury. Dog and cat urine contains high concentrations of salts and nitrogen compounds (urea). When this urine sits on soil or plant tissue, the salts raise the soil’s salinity and create osmotic stress, making it harder for plant roots to take up water and for cells to function. This chemical burn shows up as dead spots and browning tissue, especially in lawns and around sensitive ornamentals.

The other options don’t fit because fungal leaf spots with white halos are caused by a pathogen, not urine; stem cankers are also disease symptoms from pathogens or physical injury, not urine damage; and urine isn’t a reliable source of growth—its concentrated salts tend to burn tissue rather than promote healthy, increased growth.