Chemical Injury

When you see distorted, curled, or chlorotic leaves on roses, blueberries, or grapes alongside stunted new growth or underdeveloped flowers, chemical injury may be responsible. Glyphosate-based herbicides like Roundup cause bright yellow leaves on new growth that may not appear until the season after application. Other symptoms include cupped or severely reduced leaf size, needle-like new growth, or scorched foliage. Chemical injury can mimic disease symptoms, making careful observation of application history essential.

The key is prevention, since damage depends on herbicide type and dose: simply avoid spraying herbicides anywhere near susceptible plants. Herbicide drift from adjacent lawns or walkways is a common cause in home gardens, so be extremely careful when treating weeds near landscape plantings. If you accidentally spray a plant, watch it closely for recovery; mild injury often diminishes over time as the plant grows out of the affected tissue. For future applications, shield nearby plants or choose non-chemical weed management methods closer to ornamentals.