Midwestern farmers have faced a buildup of pesticide resistance in pigweeds (waterhemp and Palmer amaranth), highlighting the importance of scouting to detect weeds early in their growth stages. Otherwise, weed escapes are a common issue as herbicides lose their efficacy when weeds are allowed to grow long enough into their growth cycle. The Midwestern Regional[Read More…]
Resources for landscapes and gardens in the Midwest
Landscape Report
Weed Control
As summer comes to a close, plants are rapidly releasing seeds and the most noticeable are the flying fluffy type. Thistles, asters, and milkweed are just a few of the summer-flowering plants that depend on the wind to disperse their seeds, sometimes carrying them miles away to potentially suitable locations, though seeds typically land with[Read More…]
In the last newsletter, an article on triclopyr (www.purduelandscapereport.org/article/the-summer-of-triclopyr-mounting-evidence-for-off-target-damage/) brought up much discussion on the Roundup brands now containing multiple active ingredients other than glyphosate. Professionals in the industry may encounter a client with herbicide damage symptoms that mimic growth-regulator injury instead of typical glyphosate damage symptoms. While the client may have used Roundup, they[Read More…]
There have been a significant number of questions and problems regarding triclopyr that have come across my desk this growing season. Several of these problems have come through the Purdue Plant and Pest Diagnostic Laboratory (https://ag.purdue.edu/department/btny/ppdl/index.html) from landscapers, nurseries, and property managers. General Information about Triclopyr Triclopyr is a selective systemic herbicide belonging to the[Read More…]
A recent conversation with a landscaper about tank mixing led to a brief discussion about glyphosate products with a contact herbicide included. I thought I would share my thoughts on the addition of contact herbicides and its effectiveness on weed control. We all know that we live in a microwave society. Most people want things[Read More…]
The 2023 Purdue Turf and Landscape Seminar will be held on November 16th and 17th at the W.H. Daniel Turfgrass Research and Diagnostic Center in West Lafayette, IN. This event is designed for intermediate and advanced turf and landscape professionals, providing them with the latest technology for managing turf and landscape systems, and to maintain[Read More…]
Garlic mustard (Alliara petiolata) can be found in public parks, backyards, meadows, forests, gardens, and along roadsides throughout Indiana. The leaves have a strong garlic smell to them. Garlic mustard was first introduced from Northeastern Europe in the 1860s in Long Island, New York. Immigrants from Europe used it for food (an herb), medicine, and[Read More…]
Join us at the Purdue Turf and Landscape Field Day on July 26th! The Purdue Turf and Landscape Field Day is an annual one-day event with the objective of providing professional turf and landscape managers exposure and educational opportunities with the latest research and technical resources. The Field Day features research tours, talks on current[Read More…]
Biology: Pineapple weed (Matricaria matricariodies), behaves as either a summer or winter annual and it is commonly found throughout the United States. It is a weed of both high- and low-maintenance turfgrass lawns, landscapes, and nursery crops. Its ability to tolerate low mowing heights and highly compacted soils allow pineapple weed to compete with in weak[Read More…]
Surflan (oryzalin) is a part of many preemergence weed control programs. Being in the dinitroaniline (DNA) herbicide family (along with trifluralin, pendimethalin, prodiamine, and others), this product controls many weeds with minimum phytotoxicity to landscape plants. Oryzalin is also on the lower end of preemergence herbicide pricing, thus increasing the use of this product. You[Read More…]
How did your weed control program perform this year? Could you be 10% more efficient? Could you make your clients 10% more satisfied with the level of weed control? In today’s labor market, improving efficiency is the single best way to reallocate labor to other, more profitable, jobs. One aspect of improving efficiency in your[Read More…]
Biology: Common bermudagrass (Cynodon dactylon) is the most commonly used turfgrass in the southern United States, but it is also a difficult-to-control weed in northern turf. Bermudagrass is a drought tolerant, warm-season, perennial grass species that tolerates low mowing and actively spreads vegetatively by both rhizomes and stolons but also has the ability to spread by[Read More…]
Diagnosing herbicide injury on ornamental plants can be difficult due to the sheer number of cultivated plants and the number of active ingredients used around ornamentals. Modern cultivars of ornamental plants include characteristics much different from the species, so it’s important to know ‘normal’ to properly diagnose a problem. There are several reasons that herbicide[Read More…]
Pesticide drift can occur virtually anywhere — between neighboring farms, farms and residential properties, or neighboring residential properties. Whether it’s a next-door neighbor or a farmer who owns the field adjacent to your property, they have the legal right to apply pesticides to their property or property they lease. However, pesticide applicators also have the[Read More…]
As bud break is currently occurring on early species in southern and central Indiana, remember to be on the lookout for callery pear (Pyrus calleryana) on properties that you manage for removal. Callery pear (multiple cultivars in the landscape from this species) has become a major invasive species of concern in wild and disturbed areas[Read More…]
One of the most common weeds that present significant challenges to both landscapers and growers are thistles. There are several reasons that thistles are difficult to control, including thousands of viable seeds per plant (Fig. 1), rhizomatous growth characteristics (Canada thistle) (Fig. 2), and large root system (Fig. 3). There are three major types of[Read More…]
Preemergence herbicides should be the primary tool for a landscape weed control program. The primary reasons to develop a strong preemergence herbicide program are 1) Decreased phytotoxicity (plant damage) to landscape plants and 2) Reducing the amount of times required to visit a property. With the difficulty of attracting quality labor in our industry, time[Read More…]
The Purdue Landscape Report Team will begin a new, free online series that will start tomorrow (July 22) and follow the day after the newsletter every two weeks at noon Eastern time zone. The topics and speakers will vary each session, so check out the newsletter every two weeks to find out what follows the[Read More…]
Biology: Prostrate Spurge (Euphorbia humistrata) is a summer annual broadleaf weed that can be found in dry/sandy and/or nutrient-poor soils along with compacted, weakened or disturbed turfgrass and landscape sites. Look for it first in driveways and sidewalks or in potted plants in a landscape or nursery as temperatures start to get warmer. Prostrate spurge can also[Read More…]
This winter has been very mild, especially compared to last year. With the mild temperatures throughout the season, most plants have accumulated enough growing degree days to start bud break when temperatures become favorable. Utilizing the Spring Leaf Index, via the United States National Phenology Network (USNPN), spring has been trending 10-20+ days early this[Read More…]
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