By Scout Nelson
University of Minnesota Extension vegetable specialists Natalie Hoidal and Marissa Schuh are advising growers as cooler weather increases disease and pest pressures across Minnesota vegetable farms. Their latest update focuses on key crop health challenges as the growing season transitions into fall.
As temperatures cool, morning dew and humidity continue to create favorable conditions for disease development, even in areas experiencing drought. Growers are encouraged to monitor affected fields and use this season's observations to improve disease management strategies for future crops.
Fall frost is becoming an increasing concern for vegetable producers. Many growers are topping tomato plants to encourage fruit ripening and establishing cover crops before colder weather arrives.
Japanese beetle activity is beginning to decline, though some farms continue to report notable populations. Early monitoring and timely management remain important to limit damage to vegetables and other susceptible crops.
Disease pressure is rising in several vegetable crops. Black rot is affecting cole crops such as cabbage, and preventive practices including crop rotation, weed control, clean seed use, and avoiding field work in wet conditions can help reduce future outbreaks.
Squash mosaic virus and powdery mildew continue to impact squash and zucchini production. While infected fruit is generally still marketable, quality and storage life may be reduced.
Garlic and onion growers are also reporting cases of soft rot that can result in bulb decay and storage losses. Proper crop rotation, careful handling, and effective curing practices can help minimize disease risks.
Tomatoes remain vulnerable to soil-borne diseases such as verticillium wilt, fusarium wilt, and bacterial canker. Growers facing severe disease pressure may benefit from selecting resistant varieties or using grafted plants in future growing seasons.
Photo Credit: istock-dusanpetkovic
Categories: Minnesota, Crops