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NORTH DAKOTA WEATHER

Top tomato issues are herbicide and rot

Top tomato issues are herbicide and rot


By Scout Nelson

Tomatoes are a popular garden crop, but they often face two serious problems: herbicide damage and blossom end rot. These problems are more common than insects or diseases, according to years of experience from Extension experts.

Herbicide damage occurs when tomatoes come into contact with chemicals like 2,4-D or dicamba. These chemicals may drift from nearby lawns or farms or be present in compost or manure. When exposed, tomato leaves curl, stems twist, and the plant looks abnormal.

To prevent herbicide damage, avoid using lawn herbicides in summer. Fall is a better time to treat lawn weeds. Also, check the source of compost or manure for any chemical exposure. City compost can be risky if it contains grass sprayed with herbicides.

The second major issue is blossom end rot. This problem causes the bottom of the tomato to turn brown and rot. It is not caused by disease, but by a calcium shortage in the fruit. Most soils already have enough calcium, but drought or over-fertilizing can block calcium from reaching the fruit. Using too much nitrogen, potassium, or magnesium can also interfere with calcium movement.

Avoid blossom end rot by watering regularly and not overusing fertilizers. Some tomato types, like Roma, are more likely to get it, while cherry tomatoes are less affected.

Gardeners who need help should reach out to their local Extension office for expert support. Visit ndsu.ag/countyoffice to find one near you.

Photo Credit: gettyimages-bastetamn

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Categories: North Dakota, Crops, Fruits and Vegetables

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