Annual Aphid Infestation on Quaking Aspen: Systemic Prevention

Three 6-year-old quaking aspens get covered in green aphids each year, attracting yellow jackets. How to stop the annual invasion? Aphid Biology Aphids reproduce explosively, produce honeydew → sooty mold + wasp attract

Viburnum Leaf Spots and Stem Lesions: Check for Scale First

Snowball viburnum has white/gray spots on upper leaves, then leaves blacken, curl, fall. Same spots on branches. New growth starts clean then repeats. What is this? Primary Suspect: Scale Insects Oval, cottony-covered

Gardenia Collapse from Scale Insects: Rescue with Systemic Treatment

Gardenia dropped all leaves in 3 weeks after spring bloom. Neighbors citrus also declining. Last year: black mildew treated with fungicide. Is it gone? Can I save it? Last Years Mildew = Sooty Mold from Scale Black coat

Maple with Bare Interior: Natural Shading, Not a Problem

35–40-year-old maple has leaves only on outer branches—inner canopy bare, umbrella look. Neighbors maples are full. Some tar spot in fall. How to encourage inner growth? This Is Normal Interior leaves die from shade sup

Cedar-Apple Rust and Fruit Safety: Edible with Spot Removal

Does cedar-apple rust make apples unsafe? My juniper likely infects my apple tree. Peach and pear are unaffected. Black spots on apples. Fruit Safety Yes, safe to eat. Cut out affected spots. The fungus (Gymnosporangium

Dogwood Leaf Scorch in Sandy Soil: Environmental Stress, Not Fungus

dogwood Young dogwood in Central TX (pure sand, dappled pine shade) has brown crispy leaf edges and tiny red spots on all leaves. Crepe myrtle 50 yards away has similar browning. Watering: 24-hr trickle 2×/week. Fungus?

Dying Poplar After Root Damage from Retaining Wall Construction

Two 70-foot poplars in Northern VA. One is thinning, dropping leaves, with white/yellow discoloration and apparent rot at trunk flare. Retaining wall and new sod installed 2006 within 5 feet. Can we stop this? Diagnosis

Gardenia Mealybug Infestation: Identification and Safe Control

My gardenia has white mold on branches, leaf drop, and branch dieback. Initially thought powdery mildew, but now suspect mealybugs. How to handle? Mealybug ID Cottony white masses in leaf axils, branch crotches, unders

King Palm Pink Scaling: Fungal Disease or Scale Insects?

One of my double king palms has pink scaling with powdery residue and odd smell. Nursery advised cutting it down and reducing water. Is this right? How often should I water king palms? Two Possible Problems 1. Fungal L

Aphids on River Birch: Identification and Systemic Control

My young river birch has eggs all over lower leaves. What are they? Will the tree survive? Likely Aphids, Not Eggs The eggs are probably live aphids—green, round, soft-bodied, clustering on leaf undersides. Key ID trait

Black Spots on Aloe Vera: Bacterial/Fungal Leaf Spot Treatment

My long-established garden Aloe vera has black spots like rose black spot, with wilting brown leaf tips. What is this and how do I treat it? Diagnosis: Bacterial/Fungal Leaf Spot Aloe is prone to leaf spot diseases (Alt

Saving a Rotting Desert Rose (Adenium): Water Management and Repotting

Desert Rose Base My Adenium in NC has a soft spot on the trunk with peeling bark. Leaves look OK. Its in a plastic pot, watered regularly. Should I repot to clay? What soil? Can I save it? Diagnosis: Stem Rot from Overw

Hard White Speckles on Money Tree (Pachira): Scale Insect Infestation

My 12-year-old indoor money tree has hard white speckles on some leaves. They dont move. What is this and how do I treat it? Diagnosis: Armored Scale Insects The hard, non-moving, white speckles that scrape off with a f

Foul Odor After Yucca Root Removal: Bacterial Soft Rot Cleanup

We removed old yucca roots two weeks ago. An extremely foul odor persists. The gardener said dead roots would stop smelling. How do we eliminate the smell? Cause: Bacterial Soft Rot The putrid smell is anaerobic bacteri

Sooty Mold on Camellia Hedge: Caused by Scale Insects

My camellia hedge has black mildew on leaves, branches, and trunks. It washes off with water but returns. White oil didnt help. Its a hedge, so many plants are affected. Please help. Diagnosis: Sooty Mold (Secondary to

White Powder on Privet Hedge: Scale Insects or Powdery Mildew?

Our 80-year-old, 400-foot privet hedge has 3 plants with branches covered in white powdery substance. Leaves seem unaffected. What is this and how do we treat it? Two Likely Culprits 1. Scale Insects (Cottony Scale or

Crape Myrtle Not Blooming with Brown Leaf Edges: Sun and Water Fixes

My young crape myrtle in San Jose barely bloomed this year and has had brown, lacy leaf edges for months. Its planted in a scrub area that gets less water than the lawn. It bloomed well last year. What can I do? Two Sep

Saving a Mass Cane (Dracaena) with Soft Top and Yellowing Leaves

Mass Cane My indoor Mass Cane has a soft, mushy top on one cane with yellowing, browning leaves dying back. This is my second plant with this problem. They start fine, then decline. How can I save it? Diagnosis: Environ

Maple Leaf Galls: Insect-Caused Bumps on Autumn Blaze Maple

Our 5-year-old Autumn Blaze maple in Wisconsin has tiny balls on leaves—pale green, reddish, or dark black. Is this disease or insects? Diagnosis: Leaf Galls (Insect-Induced) These are galls—abnormal plant growths trigg

Newly Planted Lilac with Brown Leaves: Transplant Shock or Disease?

We planted an 8-foot lilac in November (NJ). It flowered and grew some, but now has brown leaf coloring and looks unhealthy. What should we do? Most Likely: Abiotic Stress / Transplant Shock Fall-planted, field-dug lila