Sugar Maples Dropping Green Leaves: Drought Stress or Fungal Issue?

Two maple trees are losing green leaves in summer; some leaves are fully green, others dried and light brown. Owner asks if its fatal and if trees should be removed. Primary Suspect: Drought Stress Early leaf drop with g

Black Spots on Aloe Vera: Bacterial Disease Treatment

A farmer in India has hundreds of Aloe Vera plants with black leaf spots and wilting, seeking a remedy. Likely Cause: Bacterial Leaf Spot Symptoms suggest a bacterial infection, often exacerbated by excess moisture. Trea

Black Scaly Substance on Willow: Soft Scale Infestation

A large white willow by a lake has black, scaly buildup on leaf stems that rubs off as reddish-purple liquid. The owner suspects scale and asks about danger and winter die-off. Confirmation: Soft Scale Insects The descri

Silky Webbing on Oak Tree: Harmless Bark Lice (Psocids)

An oak tree, struck by lightning 14 years ago with a resulting cavity, is suddenly covered in formless silky webbing on trunk and branches. No insects are visible at the bottom. The owner wants to know what it is and if

Ants on Grapefruit Tree: Sign of Pests or Dry Soil?

An old grapefruit tree has ants crawling up and down the trunk and into the canopy. The owner wonders if theyre harmful. Why Ants Are on the Tree Ants usually indicate one of two things: Dry soil: Ants forage upward whe

Hollow Oak Tree Near House: Managing Heart Rot Safely

A homeowner has a large hollow oak near the house with abundant green foliage but a hollow interior (coat hanger inserts deeply). They want home remedies to stop further decay. Understanding Heart Rot Heart rot is intern

California Oak Wetwood (Slime Flux): Bacterial Ooze, No Cure Needed

California oak has white bubbly foam from trunk bark; one limb has rot. Expert identifies Wetwood (slime flux): bacterial fermentation of sap → gas pressure forces sap out through cracks/wounds. Two types: alcoholic and

Fig Tree Leaf Scorch in Clay Soil: Watering and Fertilizer Tips

A gardener planted a 3-gallon fig tree in heavy clay/red rock soil, hosing out root ball soil and mixing potting mix with native clay. Leaves developed crispy brown edges during hot weather. They asked if clay makes grow

Mealybug Biology: Honeydew, Morphology, and Metabolism

A student or researcher asked three specific questions about mealybugs on cotton plants: the chemical composition of honeydew, mealybug metabolism, and morphology. Mealybug Honeydew Composition Honeydew is primarily plan

Rust-Colored Spots on Hamlin Oranges: Citrus Rust Mites

A gardener in Lakeland, Florida, planted 8-year-old Hamlin orange trees in spring and noticed a rust color on fruit on the north side of one tree, wondering if it was a disease. Identification: Citrus Rust Mites The rust

Why Is My Mature Oak Tree Shedding Leaves and Acorns Excessively?

A homeowner noticed their large, mature oak tree dropping green leaves with round brown spots and wilting, along with a heavy acorn drop over the past week. They asked for a diagnosis. Possible Causes of Oak Decline With

Sweetgum Crown Dieback: Construction Damage, Wait 3–5 Years

Two tall sweetgums pre-date house. Past 2 years: tops losing leaves. Doomed or stressed? Construction Disease Equipment compaction → root suffocation Grade change Sun scald on newly exposed trees Prognosis Wait 3–5

Red Maple Black Oozing: Phytophthora Bleeding Canker, Complex Management

Young red maple: black oozing trunk spots in heat, ants love it, some leaf scorch/spotting. Leaf Scorch = Stress Drought, transplant shock, etc. Oozing Causes Insects Phytophthora bleeding canker — endemic, causes tru

Corn Cane White Fluffy Dust: Pollen, Mites, Scale, or Mildew?

12-year corn cane, 2 new canes added. One flowered (fragrant, sappy). White fluffy dust spread during flower drying. Mites? Possibilities Pollen from dried flower — wash off test Spider mites — webbing, leaves dry up C

Oak Leaf Yellow Veins: Nutrient Deficiency, Fertilize with Micronutrients

oak leaf 3-year-old black oak: leaf veins bright yellow, more visible. Not herbicide. Normal or problem? Not Normal: Nutrient Deficiency Yellow veins + green tissue = reverse chlorosis. Multiple micronutrients likely lo

New Arborvitae Browning: Overwatering, Nursery Care, or Planting Issues

18 new 5-ft arborvitae, several browning. Hose watered, moisture meter reads wet. What to do? Likely Overwatering or Nursery Issues Nursery: how long dug? Watered properly? You may be overwatering (meter = wet) Dowel

Petunia Sticky Stems: Natural Defense, Not Pest Problem

Pruned petunia: sticky hairy stems/leaves, dead insects stuck. Natural defense? Never see petunia pest questions. Yes: Natural Sticky Sap Petunias have glandular trichomes that trap insects. Naturally resistant to mealy

Hedge Dead Leaf Groups: Fungal Dieback, Fungicide and Pruning

Leafy hedge: groups of dead leaves, green stems. Some stems mixed brown/green. What to do? Likely Fungal Twig/Blight Without ID, fungicide spray (Daconil — broad label). Dont cut green stems with brown leaves (may recov

Neglected Mulberry Trees in Nevada: Hard Prune and Water

Moved to NV, husband neglected 2 large mulberries. Deep drip watering 45 min 3×/wk. Foliage returning, but bark peeling on one, dead tops on both. Mulberries Are Tough Cut all dead wood — they resprout vigorously. We cu

Arborvitae Brown Patches: Abiotic or Fungal Twig Blight

4 new arborvitae (6 ft), 2 have isolated medium-brown 5 sq in patches on branches. Trimmed out. What else? Possibilities Abiotic: Water extremes, sun, transplant shock Biotic: Kabatina/Phomopsis/Pestalotiopsis twig bli