Overview:

When used properly, mulches and composts can improve soils and provide many beneficial effects to plant health and vigor. Undesirable nuisance fungi, however, may also occur when different types of mulches or composts are used under certain conditions. Some of the more common examples of these nuisance fungi include the shotgun or artillery fungus (Sphaerobolus), slime molds (Physarum), stink horns (Mutinus), bird’s nest fungi (Crucibularium), toadstool mushrooms, and several plant pathogens. Although these nuisance fungi are mostly natural decomposers of organic matter and most of them are harmless, this blog discusses how the various nuisance fungi sometimes associated with mulches and composts can be controlled or minimized.

Organic landscape mulches & composts under certain conditions can promote nuisance fungi. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)

Although stone mulch will certainly eliminate any growth of nuisance fungi, it does not benefit plant health. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)

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Challenges of Pest Controls

Accurately timing a control tactic against the most vulnerable stage of an insect’s development allows for the use of biorational pesticides as well as less use of traditional pesticides. Unfortunately, accurately timing controls is difficult because of the complex array of landscape plants and pests that can be present on any one site. IPM methods require knowledge of the pest’s life cycle stages and when the vulnerable stage occurs for each pest. It requires knowledge of what pesticides will suppress the pest as well as their relative toxicities. This extensive amount of information can become overwhelming, especially to the less experienced landscaper or arborist.

Some landscape managers often resign to the easy, yet environmentally unsound practice of using four or more preventative cover sprays of pesticides each year. Studies have shown that typically only 2% of a blanket spray actually hits a targeted pest, with the remaining 98% contaminating the surrounding environment. Is there another way that pesticides can be applied more intelligently?

Farmers know that when White Oak leaves are the size of a squirrel’s ear, THEN…. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)

….THEN, =It is time to Sow Corn into the planting fields. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)

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History

During the late 1950’s and early 1960’s, Integrated Pest Management (IPM) was an approach to field crop management that farmers increasingly began to practice in the United States. It took barely a decade for farm agriculture to fully realize the problems associated with the over-reliance on pesticides when controlling pests. The classic example of the overuse of the chlorinated hydrocarbon (DDT) immediately comes to mind. Despite the astonishing success that synthetic pesticides usually have at killing pests, some have failed with disastrous results. This especially has occurred when the same material was used repeatedly over extended periods of time. For this reason, the IPM approach became necessary for US farmers managing extensive row crops. Approximately 20-25 years after farmers began implementing IPM methods, the landscaping or “green industry” started to gradually incorporate IPM methods into their service programs.

US Agriculture initially began to practice IPM with extensive row crop farming more than 60 years ago. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)

The use of GMO’s with crops such as Round-Up Ready soybeans & corn is certainly an IPM tactic, but emerging complications are a concern. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)

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WITCHES’ BROOMS: The development of witches’ brooms on woody plants and the resulting formation of abnormal growth can cause curiosity and concern to your clients. Typically, the new growth is distorted, and a proliferation of leaves or fruit/cones closely clumped together appears when apical dominance is lost. Witches’ Brooms are created on plants when the transfer of growth hormones is disrupted (perhaps caused from the introduction of a foreign substance). Insects (e.g., aphids), fungi, bacteria, viruses, phytoplasmas, and herbicides have all been implicated in causing the formation of witches’ brooms in many plant species.

Witches’ Brooms are plants having stunted foliage & short stem internodes. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)

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KEY PLANTS vs. KEY PESTS vs. KEY LOCATIONS CONCEPT:

Landscape IPM (Integrated Pest Management) methods require site-specific information. Every landscape typically contains at least several key pests, key plants and key locations that will be unique to each site. These concepts are extremely useful to simplify monitoring procedures at any given landscape. They will enable field technicians to concentrate on plants and locations that are prone to problems as well as those plants and locations that have low aesthetic thresholds. Scouting efficiency should improve and a more productive use of time spent on landscapes is the result. It is important to emphasize that Integrated Pest Management is a philosophy & practitioners will need to develop skills & experience to improve their levels of commitment.

A diverse, well designed landscape that will unlikely develop many pest problems. (Photo Credit: Steven K. Rettke, Rutgers Coop. Ext.)

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