Grass-selective herbicides are valuable to weed management in broadleaf vegetable crops. As harvest season draws closer, it is important to note that not all grass herbicides have the same pre-harvest interval (PHI) requirements. The two most commonly used grass-selective herbicides are clethodim and sethoxydim. While most PHI’s are similar between the two (Table 1), there[Read More…]
Weed Management
Velvetleaf (Abutilon theophrasti) – Mallow Family Synonyms: pie marker, buttonweed, Indian mallow, butter print, velvet weed, butter-weed, Indian hemp, cotton-weed, and wild cotton. Identification and General Description Summer annual that grows 3 to 8 feet tall. Heart-shaped leaves and stems are covered with short, soft hairs giving it a velvety feel. Young leaves and stems[Read More…]
As of March 29, 2022, Reflex herbicide is registered for use on select vegetables in the state of Indiana through an indemnified 24(c) special local needs label. Below we discuss what this means for Indiana vegetable producers and how to access the new label. What crops are included?: Pea (succulent) Bell and non-bell pepper (transplanted)[Read More…]
If you use the herbicides Valor® or Chateau®, you may notice a change with your next jug. Valent U.S.A. Corporation is phasing out production of Valor SX® and Chateau SW®, both water soluble granule formulations. The new liquid formulations are called Valor EZ® and Chateau EZ®. While the granular formations contain 51% of the active[Read More…]
A special project group of the North Central Integrated Pest Management (IPM) Center wants to learn about your concerns and experiences with herbicide drift. The group is surveying growers of fruits, vegetables, and other specialty crops in the upper Midwest. To truly understand the frequency, severity, and economic impact of herbicide drift on specialty crops,[Read More…]
Pyridate herbicide was once a cornerstone of broadleaf weed control in mint before its market withdrawal. Recently the use of pyridate (Tough® 5EC) was limited to emergency exemption use, also known as a Section 18 label, which had to be requested and approved annually. However, a new Tough® 5EC label was approved by the EPA[Read More…]
The vegetable crops have all been harvested and it’s time to just relax, right? Maybe. However, the decisions you make this fall will influence your weed control next spring. In all likelihood, you did not control EVERY weed during the growing season. Inevitably, there were weeds that escaped control. If so, these weeds have already[Read More…]
Genus: Ipomoea sp. Species: Ivyleaf: Ipomoea hederacea Entireleaf: Ipomoea hederacea integriuscula Tall: Ipomoea purpurea Pitted: Ipomoea lacunosa Morningglories are among the most troublesome weeds in many cropping systems in the Midwest. They are difficult to control due to their fast growth, large seed size, and impenetrable seed coat. Morningglories get their name because their flowers[Read More…]
Scientific names: Erigeron canadensis or Conyza canadensis Horseweed, also known as marestail, fleabane, or colt’s tail, is a common and troublesome weed throughout North America due to its high seed production, wind dissemination, lack of seed dormancy, and adaptability to dry and moist soil. Moreover, horseweed populations have shown to be resistant to Group 2[Read More…]
Scientific name: Chenopodium album Common lambsquarters is originally from Eurasia. It is an aggressive weed, adapted to grow vigorously in many different climates and soils, and has been able to establish worldwide. In North America it was once grown as a vegetable crop. In Asia and Africa, it is still cultivated to use as a[Read More…]