Blog Archives

Common Diseases of Spruce in Kentucky (PPFS-OR-W-24)

Spruce trees, particularly blue spruce (Picea pungens) and Norway spruce (Picea abies), are popular landscape trees in Kentucky. Unfortunately, these trees present problems for homeowners when they show evidence of poor vigor, dieback, or needle drop.  This publication discusses the

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When White Pines Turn Brown…Common Problems of White Pines in Kentucky (PPFS-OR-W-22)

Eastern white pine (Pinus strobus) is a popular conifer in many Kentucky landscapes; however, this species is subject to browning as a result of various environmental and disease problems. In Kentucky, brown needles on white pine are often caused by

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Plant Diseases – Kentucky Master Gardener Manual Chapter 6 (PPA-46)

The Plant Disease chapter in the Master Gardener Manual (Figure 1) focuses on those living organisms that cause disease: fungi, water molds, bacteria, viruses, nematodes, phytoplasmas, and parasitic plants. Large, color pictures (Figure 2) that depict selected stages in various

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Featured Publication

Diagnosis of “No Disease” (PPFS-GEN-11) Extension Agents and growers may occasionally receive diagnostic reports from a University of Kentucky Plant Disease Diagnostic Laboratory that indicate “no disease was found.”  The following fact sheet provides possible reasons behind this diagnosis. Diagnosis

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Don’t Eat Those Wild Mushrooms…unless you know what you are doing! (PPFS-GEN-14/FORFS-16-01)

A variety of mushrooms can be seen in landscape mulch, in lawns, on forest floors, and in open meadows after autumn rains.  For many, there may be a temptation to gather and eat these wild mushrooms or toadstools.  Unfortunately, there

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Risk Factors for Sclerotinia Crown &Stem Rot in Fall-seeded Alfalfa (PPFS-AG-F-02)

Alfalfa seeded during late summer or fall is susceptible to the destructive disease Sclerotinia crown and stem rot. Fall-seeded stands are particularly vulnerable to this disease because the young seedlings do not have sufficient time to develop adequate resistance before infectious spores

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Crown Gall (PPFS-GEN-01)

Crown gall can affect a wide range of crops, including woody ornamentals, tree fruits, and small fruits.  Plants in commercial and residential plantings can suffer losses from this bacterial disease. This publication provides information on crown gall and its effect

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Managing Diseases with Sanitation Practices

When diseases occur in commercial or residential plantings, it is often presumed that fungicides are the most important and effective disease management tools available.  However, a good sanitation program can help reduce the need for chemical controls and can improve

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How Dry Seasons Affect Woody Plants (ID-89)

Pattern, frequency, and amounts of rainfall are important components to plant health. During dry seasons and drought conditions, plants become stressed. Growth ceases, nutrient transport slows, and plants wilt as cells become water-deficient. Severe, long-term, or consecutive drought events may

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Bacterial Wilt of Cucurbits – Quick Facts (PPFS-VG-11 QF)

Bacterial wilt is a common, often destructive, disease of cucurbits. This disease can cause nearly complete losses of a planting before the first harvest. Bacterial wilt primarily affects cucumber and muskmelon (cantaloupe). While squash and pumpkin are also susceptible, the

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A Profile of Commercial Apple Production in Kentucky

Apple production in Kentucky is small, from less than 1 acre to just over 40 acres, yet profitable. Cash value of Kentucky apple production is valued at $24.4 million to $40.6 million per year. Apple orchards are distributed throughout Kentucky,

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Necrotic Ring Spot and Summer Patch in Kentucky Bluegrass Lawns (PPFS-0R-T-06)

Necrotic ring spot and summer patch are two patch diseases that can be very destructive when Kentucky bluegrass is grown under intensive management. These diseases become a concern in lawns when improper management practices, such as close mowing, promote disease

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Managing Tobamoviruses in Greenhouse Production (PPFS-GH-08)

Tobamoviruses, including tobacco mosaic virus (TMV) and the new tomato brown rugose fruit virus (ToBRFV), can be persistent in greenhouses and other protected cropping environments.  Herbaceous ornamentals, vegetables, and tobacco can be affected by tobamoviruses.  Once introduced into a site,

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Managing Diseases of Herbaceous Ornamentals (PPFS-OR-H-01)

Herbaceous landscape ornamentals can succumb to various adverse factors, including infectious and non-infectious diseases.  Managing Diseases of Herbaceous Ornamentals provides suggestions for symptom recognition and management approaches to common problems of these crops in residential and commercial landscape plantings, greenhouses,

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Foliar Diseases of Cucurbits (PPFS-VG-10)

Alternaria leaf blight, angular leaf spot, anthracnose, downy mildew, and powdery mildew are foliar diseases that commonly affect cucurbit vegetables in Kentucky.  Losses can occur in both commercial and residential plantings.  Vegetables in the cucurbit family include cucumber, gourds, muskmelon

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