Dormant oil is one of the most reliable, least disruptive tools orchardists have for managing armored and soft scales on pome and stone fruit. Used correctly, it suppresses overwintering scale females and their eggs, reduces early-season infestation levels, and preserves beneficial insects better than many broad-spectrum insecticides. Timing and technique are critical in Maryland orchards, […]
Root rot is a common and destructive problem in Maryland gardens and landscapes. Perennials from herbaceous border plants to semi-woody shrubs can suffer reduced vigor, foliar yellowing, sudden wilting, and eventual death when roots are compromised. Understanding the pathogens involved, the environmental conditions that favor them, and practical management options is essential for growers, landscapers, […]
Overview: why bacterial spot matters for Maryland growers Bacterial spot, caused by Xanthomonas arboricola pv. pruni (formerly Xanthomonas campestris pv. pruni and commonly called X. pruni), is one of the most damaging bacterial diseases of stone fruit. In Maryland, where spring and early-summer weather often brings extended wet periods, the disease can reduce fruit quality, […]
Why beneficial wasps matter in vegetable beds Beneficial wasps are an underappreciated ally in vegetable gardening. Many wasps are predators or parasitoids of common vegetable pests such as caterpillars, aphids, leaf miners, beetle larvae, and whiteflies. In Maryland, where summers are warm and gardens are active from spring through fall, relying on beneficial wasps can […]
Powdery mildew is one of the most common fungal problems that affects roses in Maryland. It presents as a white or gray powdery coating on leaves, stems, and buds and can weaken plants, reduce blooms, and make roses look unsightly. Because Maryland has a mix of humid summers, mild springs, and variable microclimates, powdery mildew […]
Integrated Pest Management (IPM) is a strategic, science-based approach to managing pests that combines monitoring, cultural practices, biological control, mechanical control, and selective chemical use only when necessary. For Maryland gardeners–ranging from small urban lots in Baltimore to suburban yards in the Eastern Shore and rural properties in western Maryland–IPM offers practical ways to protect […]
Armillaria root rot is one of the most important chronic diseases affecting shade trees in Maryland. It attacks roots and lower trunks, slowly weakening trees until they fail, and it can persist for many years in infected wood and stumps. This article explains how to identify Armillaria, how the fungus behaves in Maryland landscapes, and […]
Sudden oak decline is a phrase that homeowners, arborists, and land managers may use when an oak tree shows rapid deterioration. In Maryland the phrase can describe a range of problems — from a specific pathogen-driven syndrome to a complex of stressors, insects, and secondary fungi that together cause rapid canopy loss. This article explains […]
Bacterial canker is a significant disease of stone fruit (peach, nectarine, plum, cherry, apricot) that can cause branch dieback, reduced yield, tree decline and, in severe cases, tree death. Accurate diagnosis is essential because the disease can be confused with fungal cankers, winter injury, herbicide damage, or insect damage. This article provides practical, step-by-step guidance […]
Powdery mildew is one of the most common and visible diseases of cucurbits in Maryland home gardens. Gardeners first notice white, powdery patches on leaves and stems, then watch plants yellow, wilt, and decline in vigor. Understanding why this disease appears and how it behaves in Maryland’s climate is the key to managing it successfully. […]
Understanding and managing scale insects is essential for maintaining healthy fruit trees in Maryland. Scale species can colonize bark, branches, fruit spurs, and even fruit, reducing vigor, lowering yields, and creating entry points for secondary diseases. This article provides a practical, season-by-season approach to identification, monitoring, cultural measures, biological support, and targeted treatments that fit […]
Thrips are tiny, slender insects that cause outsized cosmetic and economic damage to Maryland ornamentals. Left unchecked they scar petals and leaves, reduce flowering, and transmit viral diseases such as impatiens necrotic spot virus (INSV) and tomato spotted wilt virus (TSWV). This guide lays out a practical, integrated strategy for homeowners, landscapers, nurseries, and greenhouse […]
Summer patch is a turf disease that shows up in the heat of the year and can quickly damage lawns composed of cool-season grasses. In Maryland, which sits in the “transition zone” between cool and warm climates, the combination of hot, humid summers and sporadic rainfall creates ideal conditions for summer patch to develop. This […]
Pine wilt disease is an aggressive, often lethal disorder of many pine species caused by the pinewood nematode (Bursaphelenchus xylophilus) and spread by longhorned pine sawyer beetles (Monochamus spp.). In Maryland landscapes the disease can progress rapidly and create localized mortality that threatens specimen trees, windbreaks, reforestation plantings, nurseries, and Christmas tree operations. Knowing precisely […]
Powdery mildew is one of the most important fungal diseases affecting grapes in Maryland. Left unchecked it reduces fruit quality, lowers yields, interferes with ripening, and increases susceptibility to other disorders. The disease is best managed preventively: by timing cultural practices and fungicide applications to protect young tissue during the periods of greatest vulnerability. This […]
Overview Leafminers are the larval stage of several insect groups that feed between the upper and lower surfaces of leaves, creating visible tunnels or blotches. In Maryland landscapes, leafminers can affect a wide variety of ornamental trees and shrubs, reducing aesthetic value and, in severe cases, stressing plants. This article surveys the main types of […]
Bacterial leaf spot is a common and destructive disease of tomato in Maryland. Left unchecked it reduces photosynthesis, defoliates plants, lowers yields and can ruin fruit quality. This article provides an in-depth, practical guide for diagnosing, preventing, and treating bacterial leaf spot in home gardens and small farms in Maryland, emphasizing cultural controls, sanitation, and […]
Cutworms are among the most common and damaging early-season pests of seedlings in Maryland. These nocturnal caterpillars sever young plants at or just below the soil surface, often leaving entire rows of transplants or direct-seeded crops wilted and lying on the ground. For gardeners and small-scale growers committed to organic practices, effective control requires a […]
Understanding how to prevent and manage canker diseases in newly planted trees is essential for establishing a healthy urban and suburban canopy in Maryland. Cankers are localized dead areas on stems, branches, or trunk bark caused by fungi or bacteria. They are often opportunistic, exploiting wounds, stress, or poor site conditions. This article describes what […]
Mulching is one of the simplest, most cost-effective cultural practices a Maryland gardener, landscape professional, or small-scale farmer can use to reduce soil-borne diseases and improve plant health. When chosen and applied correctly, mulch alters the microenvironment around plants in ways that suppress pathogens, promote beneficial organisms, reduce plant stress, and limit the pathways by […]
Slug damage is one of the most frustrating problems for home vegetable gardeners in Maryland. Slugs feed at night, hide during the day, and can wipe out seedlings or scab fruit in a single season if left unchecked. This guide explains how to identify slug problems, why slugs thrive in mid-Atlantic vegetable beds, and — […]
Gypsy Moth outbreaks are among the most conspicuous and damaging forest and landscape insect disturbances in Maryland. Knowing what their defoliation looks like, when to expect it, and what to do about it helps homeowners, land managers, and natural resource professionals reduce tree stress and prevent unnecessary tree loss. This article describes clear, practical indicators […]
Spotted wilt disease, most commonly caused by Tomato spotted wilt virus (TSWV) and related tospoviruses, is a recurrent concern for vegetable growers in Maryland. Accurate diagnosis is critical because visual symptoms can be confused with nutrient deficiencies, herbicide injury, or other pathogens, and because management options hinge on confirming a viral problem and understanding vector […]
Azaleas are a staple of Maryland landscapes, prized for their spring color and evergreen foliage. Yet many homeowners and landscape professionals notice a recurring problem: stippled, bleached-looking leaves and black specks under the foliage. These symptoms are usually caused by azalea lace bugs. Understanding why lace bugs attack Maryland azaleas, how they live and spread, […]
Gardens in Maryland face a familiar set of small mammal problems: squirrels digging up bulbs and scattering mulch, voles tunneling through lawns and gnawing roots, mice nesting in sheds, and rats raiding compost and pet food. These animals are persistent but manageable when you use a practical, layered approach: remove attractants, exclude where possible, use […]
Scale insects are one of the most common and damaging sap-feeding pests of shade trees in Maryland. Left unchecked, heavy scale infestations cause branch dieback, reduced growth, sticky honeydew, sooty mold, and in severe cases the death of small trees and long-term decline of larger specimens. Preventing scale requires a combination of annual tree care, […]
Anthracnose is a common fungal leaf and twig disease that affects many shade and street trees in Maryland, especially sycamore, maple, and oak species. Timing applications correctly is the single most important factor in reducing disease severity. This article explains the disease cycle, weather and phenology cues to watch for in Maryland, recommended timing for […]
Maryland’s climate–warm, humid summers and cool, wet springs and falls–creates ideal conditions for numerous foliar fungi. Fungal leaf spots reduce aesthetic value, lower plant vigor, and in severe or repeated outbreaks can predispose plants to other stresses. This article summarizes the most common types of fungal leaf spots affecting Maryland landscape plants, explains how to […]
Damping-off is a common seedling disease complex that affects home gardeners, greenhouse growers, and commercial nurseries across Maryland. Accurate diagnosis is the first step to managing losses and preventing recurrence. This article lays out a practical, step-by-step diagnostic approach you can use in the field, in a home propagation area, or when preparing samples for […]
Understanding and controlling bagworms on evergreens in Maryland requires a combination of timely scouting, physical removal, and judicious use of organic biological products. Bagworms (the common species in the eastern U.S. is Thyridopteryx ephemeraeformis) can defoliate and even kill arborvitae, juniper, cedars and other landscape evergreens if left unchecked. This guide gives concrete, practical, season-by-season […]
Phytophthora root rot is one of the most insidious problems for container-grown plants in Maryland. It thrives where water sits, roots are stressed, and contaminated soil or tools spread the pathogen. For hobbyists, nurseries, and landscapers who use containers on patios, decks, and balconies, preventing Phytophthora requires a combination of smart container design, careful watering, […]
Biological control using native predators is an effective, ecologically sound way to reduce insect pest pressure in Maryland landscapes, farms, and backyards. Instead of relying primarily on broad-spectrum insecticides, managers can cultivate the presence and effectiveness of birds, bats, predatory insects, spiders, and aquatic predators that are adapted to local climates, seasonal cycles, and pest […]
Root-knot nematodes (Meloidogyne spp.) are microscopic soil-borne roundworms that cause significant yield loss and plant decline in home gardens and small-scale vegetable farms across Maryland. They attack roots, induce galling, reduce water and nutrient uptake, and interact with other soil pathogens to accelerate crop failure. This article gives a practical, region-specific guide: how to identify, […]
Verticillium wilt is a soilborne fungal disease that affects hundreds of plant species. In Maryland landscapes, it shows up in perennials with a characteristic pattern of wilting and vascular discoloration that can be mistaken for drought stress, root rot, or other vascular diseases. This article explains what Verticillium wilt looks like in Maryland perennials, how […]
What is cedar-apple rust? Cedar-apple rust is a fungal disease caused by species in the genus Gymnosporangium. It is a two-host pathogen that requires both a juniper (commonly called “cedar” in the Mid-Atlantic) and a member of the apple family (Malus species, including apples, crabapples, quince, hawthorn and serviceberry) to complete its life cycle. Cedar-apple […]
Fire blight is one of the most damaging bacterial diseases of pome fruits (apples, pears, quince) and many related ornamentals. In Maryland orchards it appears regularly and can strike rapidly during spring and early summer, causing blossom blight, shoot dieback, and canker formation that reduces yield and tree longevity. Understanding why trees in Maryland are […]
Tomato hornworms are among the most conspicuous and destructive caterpillars in Maryland vegetable gardens. They can defoliate tomato, pepper, eggplant, and potato plants quickly, and their size and color can make them hard to notice until significant damage is done. This article gives in-depth, practical guidance for home gardeners and small-scale growers in Maryland who […]
Japanese beetles (Popillia japonica) are one of the most conspicuous and damaging garden pests in Maryland. If left unchecked they can skeletonize foliage, defoliate roses and fruit trees, and damage vegetables and ornamental shrubs. This article explains how to identify them, understand their life cycle and seasonal timing in Maryland, and implement an integrated approach […]
Roses are a staple of Maryland landscapes, offering years of color and fragrance when properly maintained. The same humid, variable climate that favors rose growth also encourages a suite of fungal and bacterial diseases. Knowing when to treat — and how aggressively to act — is as important as knowing what to apply. This article […]
Trees across Maryland face an expanding suite of invasive insect pests. These insects can severely weaken or kill urban, suburban, and forest trees, alter ecosystems, reduce property values, and create long-term management costs for homeowners and municipalities. This article describes the most significant invasive insect threats in Maryland, explains how to identify infestations, outlines practical […]
Root rot is one of the most common and frustrating problems for gardeners who grow plants in containers. In Maryland’s humid climate and variable seasonal rainfall, container-grown plants are especially vulnerable because potting mix can stay saturated, creating ideal conditions for soil-borne pathogens. This article gives a practical, step-by-step approach to diagnose root rot, decide […]
Scale insects are a common and persistent problem for houseplant growers in Maryland. Whether you keep succulents on a sunny windowsill, tropicals in a bright room, or citrus in a sunroom, scale can quietly establish and damage plants by sucking sap, causing yellowing leaves, stunted growth, sticky honeydew, and secondary fungal growth. This article presents […]
Deer browsing can be one of the most persistent and frustrating problems for Maryland homeowners. Where suburban sprawl interfaces with woodlands and agricultural land, white-tailed deer thrive and find attractive food in gardens, ornamental plantings, vegetable patches, and young trees. This article reviews effective, practical methods to reduce deer damage in Maryland yards, explains how […]
Native plantings are one of the most effective, long-term strategies for reducing pest pressure in home and community gardens in Maryland. By choosing species adapted to local climate, soils, and natural enemies, gardeners can create plant communities that are more resilient, require fewer chemical controls, and support beneficial insects, birds, and soil organisms. This article […]
Overview Aphids are among the most common and persistent pests on vegetable plants in Maryland. They reproduce rapidly, feed on sap, excrete sticky honeydew, and transmit plant viruses. Because Maryland has a temperate climate with warm, humid summers and mild springs, aphid populations can explode quickly on both home garden and small-scale commercial vegetable plantings. […]
The emerald ash borer (Agrilus planipennis), commonly called EAB, has reshaped how Maryland communities manage ash trees. Recognizing the signs of EAB damage early is essential for homeowners, municipal managers, and arborists because timely action can save valuable trees or guide safe removal before hazards develop. This article describes the visible symptoms of EAB in […]
Powdery mildew is one of the most common and visually obvious fungal problems in Maryland landscapes and home gardens. It appears as white or grayish powdery growth on leaves, stems, buds, and sometimes flowers. Although generally not fatal for mature ornamentals, powdery mildew reduces vigor and flowering, creates unsightly foliage, and can predispose plants to […]
Tomato growers in Maryland frequently face a disease that can wipe out plants quickly and devastate yields: late blight. This disease, caused by the oomycete Phytophthora infestans, thrives under the climate conditions that are common in the mid-Atlantic. Understanding why tomato plants develop late blight in Maryland requires looking at the pathogen biology, the local […]
Boxwood blight is one of the most destructive diseases of boxwood (Buxus spp.) in landscape settings. Maryland’s warm, humid summers and compact suburban plantings create ideal conditions for this disease to establish and spread rapidly. This article provides clear, practical, science-based guidance for identifying, preventing, and managing boxwood blight in Maryland landscapes. It emphasizes sanitation, […]
Spotted lanternfly is one of the most destructive invasive pests affecting landscapes, vineyards, orchards, and home gardens across the Mid-Atlantic. Preventing damage in Maryland gardens requires a combination of timely detection, targeted cultural actions, and careful use of control tools. This guide explains how to identify the pest, how and when it does the most […]