|"Classic" Glyphosate Symptom|
Recently, the clinic has received several tomato plants with symptoms of herbicide damage. Glyphosate (found in products like Roundup) causes very distinctive yellowing symptoms at the base of tomato leaflets. Broad-leaf weed killers (2,4-D type herbicides) cause stunted and deformed new growth, and whipping and curling of the leaves.
|2-4 D Type Injury|
Tomatoes are very sensitive to herbicide injury and damage can be severe. In extreme cases, simply touching tomato plants with herbicide-contaminated hands or clothing can cause injury.
Spray drift is an important source of herbicide damage. Sometimes symptoms appear in a gradient pattern, with plants closest to source being more affected than those further away.
Be careful to prevent herbicide drift into home gardens, farms, or greenhouses where tomatoes are growing. To reduce the chances of spray drift, do not apply herbicides near these areas on windy days.
|Glyphosate Drift in Greenhouse|