Rhizomatous bearded iris (Iris x germanica) is a favorite early spring perennial; however, it is routinely troubled by a fungal leaf spot that tends to appear soon after flowering (Figure 1). These start as small wet-looking lesions that may quickly enlarge into larger spots with brownish edges, tan centers and yellow margins (Figure 2). When…Read more about Iris Leaf Spot[Read More]
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Landscape Report
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Pruning is an important maintenance practice on trees that is discussed a great deal. An essential part of making the pruning cut properly is the ability to identify the parts of a branch. Identification of the branch bark ridge and branch collar are vital to severing the branch in a place that facilitates fast and…Read more about Branch component identification for better pruning cuts[Read More]
While fungi are responsible for many of our foliar disease problems, different fungal pathogens present as problems throughout the country, depending upon the host plant grown and the environmental conditions. This is a brief overview of several common types of fungal leaf diseases occur in Indiana and throughout North America (and Europe). Recognizing the symptoms…Read more about Foliar Fungal Disease Management[Read More]
The indirect effects of the pandemic are continuing to plague the Green Industry. In addition to the on-going, severe labor deficiencies that are plaguing most companies, many plants are in short supply or completely unavailable. In my recent travels, several nurseries and landscapers have discussed some of the specific issues they have been facing regarding…Read more about Green Industry Experiencing Reduced Plant Availability[Read More]
Tobacco rattle virus (TRV) is a very important pathogen in the ornamental industry. Don’t let the name fool you. Much like Tomato spotted wilt virus and Alfalfa mosaic virus, TRV has a wide host range that includes more than 400 plant species, and is not restricted to Tobacco or vegetables. Plant viruses are named after…Read more about Tobacco Rattle Virus (TRV)[Read More]
PART 2 – The Importance of Chemical Soil Testing To determine soil fertility, soil acidity (pH), and organic matter percentages, it is absolutely essential to test your soil. A soil test will tell you how much, if any, organic matter, lime, sulfur, and or fertilizer your soil needs. Determining whether or not your soil needs…Read more about Why is Professional Soil Testing So Essential??? – PART 2[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 about Options for Dealing with a Pesticide Drift Incident[Read More]
Dianthus is a much-admired perennial, but occasionally it develops serious disease problems. The most dramatic of these is anthracnose, caused by the fungus Colletotrichum. The disease may spread rapidly on greenhouse benches or in landscape plantings of susceptible dianthus varieties. The old-fashioned ‘Sweet William’ varieties seem to tolerate this disease fairly well and may only…Read more about Dianthus Anthracnose[Read More]
The Purdue Landscape Report Virtual educational series begins the second season on May 5th at 10:00 am (Eastern). Various speakers will present timely information during the growing season for the Green Industry. You have the opportunity to ask questions and interact with the speakers at each event. The 2020 educational events can be found on…Read more about Purdue Landscape Report Virtual-The second season begins![Read More]
The hard freeze last week had many homeowners concerned about their perennial and annual plants in their landscape. For the vast majority of perennial plants, there aren’t many issues long-term of concern. Some foliage and flowers have significant damage, but the plants will recover, and possibly release new vegetative buds in severe cases. The plants…Read more about Effects of Recent Cold Temperatures on Plants[Read More]
PART 1 – The Importance of “Physical” Soil Testing In my 40 years of teaching and consulting, one of the biggest and most frustrating problems I continually encounter is when so called “landscape professionals” and homeowners continue to apply annual soil fertilizers, lime, and other soil amendments without ever conducting a professional soils test. Before…Read more about WHY is Professional Soil Testing So Essential ??? – PART 1[Read More]
Fungicides are important tools for managing ornamental plant diseases (Fig. 1). There are many different fungicides and numerous methods of classifying them. One way to classify fungicides is by their chemical structures or modes of action — the specific ways the fungicides kill a fungus. Fungicides that share a common mode of action belong to…Read more about Putting the spin on fungicide rotations[Read More]
This week’s forecast is indicating unseasonably cold temperatures for most of the state with lows in the lower 20’s. While the temperatures shouldn’t reach record setting status, it could cause some plant stress. Plants are most susceptible to cold injury going into dormancy and coming out of dormancy, with maximum cold hardiness during the winter. …Read more about Effect of Cold Temperatures During Bud Break[Read More]
When spring mulching occurs, most companies will apply a preemergence herbicide for extending weed control. It is well known that the combination of mulch and preemergence herbicides is a very effective method in controlling weeds (https://purduelandscapereport.org//article/cultural-plus-chemicala-good-weed-control-combo-in-landscape-beds/). When applying preemergence herbicides with mulch, which should be first for the most effective control? This common question is…Read more about Above or Below Mulch: Should you apply preemergence herbicides before or after mulching?[Read More]
We receive a large number of spruce samples each year at the PPDL, with the vast majority being from Colorado blue spruce with needlecast. Many others show lower needle yellowing, which could be associated with nutrient deficiency or root stress. Figure 1 and 2. However we are receiving an increasing number of Norway spruce…Read more about Phomopsis Dieback of Spruce[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 about Annual Reminder to Identify Callery Pear for Removal[Read More]
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