New Lilac Hedge Shows Brown Leaf Channels and Wilting: Diagnostic Questions

A spring-planted lilac hedge bloomed well but now exhibits brown dead channels between leaf veins and wilts without watering every 2–3 days. The owner offered photos via email. Expert Response: Need More Information Ste

Indian Bean Tree (Catalpa) Wilting with Rotten Core: Verticillium Wilt Confirmed

A 5-year-old catalpa showed sudden wilting on half its branches. Pruning revealed black, soft, 3–4 mm diameter rotten cores. The owner feared spread to a nearby valuable maple (Acer). Diagnosis: Verticillium Wilt Jen id

Silver Maple Trunk Cracks and Oozing: Phytophthora Canker Diagnosis

A Sacramento silver maple had multiple trunk gashes and dark oozing sap. Two arborists disagreed: one blamed beetles, the other a disease (tar). The canopy was full and well-watered. Expert Conclusion: Phytophthora Blee

Sudden Hemlock Decline: Drought Damage or Hidden Injury?

A 50-year-old hemlock in western Massachusetts lost its top half in three weeks—completely brown while the lower half remained green. No visible pests or disease signs. The owner wondered if summer drought was the cause

Locust Tree Bark Splitting and Dead Branches: Heat, Drought, and Proper Pruning

A locust tree showed bark cracks with reddish wood underneath, dead branches, and a history of sucker removal seven years prior. The owner asked if pruning now was safe and what caused the splitting. Answer: Environment

Scale and Moss on Camellia Stems: Identification and Organic Treatment

A newly planted camellia sasanqua hedge showed both scale insects and moss on stems and trunks, more severe on one advanced specimen. The gardener wondered if the problem spread from that plant or the landscape. Expert

Carrotwood Tree Leaf Drop: Too Much Water Can Be Just as Harmful as Too Little

A 20-year-old carrotwood tree in Southern California began thinning dramatically after a sprinkler malfunction soaked its trunk, leading to green moss growth four feet up. The owner corrected the irrigation, but leaf dro

Why Are My Squash Rotting on the Vine? Expert Diagnosis for a Baffling Case

A veteran gardener with 40 years of experience faced a mysterious crisis: every variety of trellised squash—from baby fruits to 30-pound jumbo pink bananas—suddenly turned brown, mushy, and rotted on the vine. The plants

Squash Fruit Rot on Trellised Plants: Choanephora or Heat

An experienced organic gardener sees sudden, total rot of squash fruit (all 10 varieties) at all stages—babies to 30-lb giants. Plants healthy, trellised, drip-irrigated, bee-pollinated. Powdery mildew controlled with co

Morning Glory Rust: Neem and Sanitation

Morning glories around an outdoor shower develop orange spots (rust fungus) and dying leaves. Owner asks about fungicide and soil contamination. Diagnosis: Rust Fungus Rust requires two hosts (e.g., cedar-apple), but mor

Chinese Pistache Leaf Curl and Yellowing: Drought Stress

A 4-year-old Chinese pistache in a sloped lawn shows yellow, curled, dry leaves. A larger tree downslope gets more water and looks fine. Cause: Shallow Roots + Heat + Slope Chinese pistache has relatively shallow roots.

Crape Myrtle Powdery Mildew: Fungicides and Pruning Advice

Two mature crape myrtles have severe powdery mildew, didnt bloom, fungicides failed, owner cut all foliage back. Why Mildew This Year? Dry weather, warm days, cool nights favor powdery mildew. Fungicides work best as pre

Bird's Nest Fungus in Mulch: Harmless and Cool

A homeowner finds cup-shaped structures with eggs in mulch, worried about mold/fungi. Identification Its Birds Nest Fungus (family Nidulariaceae). The cups are peridia; the eggs are peridioles containing spores. They dec

Arborvitae Browning: Seiridium Canker from Stress

Emerald Green arborvitae planted last July; one suddenly shows a large brown patch spreading downward from leaf tips. Adjacent tree now showing tip browning. Diagnosis: Seiridium Canker Caused by Seiridium unicorne. Affe

Large Schefflera Dropping Leaves: Overwatering in New Pot

A large-leaf Schefflera drops leaves that turn brown on the plant. Repotted 1.5 months ago; watered when dry, filtered light. Two small Scheffleras nearby thrive. The Problem: Watering the Wrong Zone Newly potted plants

Millipedes in Houseplant Soil: Organic Deterrents

A Schefflera has spotted snake millipedes (tiny, translucent, ½ inch). After moving plants to garage and drenching with Ortho Max, many surfaced. Owner wants to save the 4-ft plant. Millipede Facts Millipedes are detriti

Photinia Pruning and Illness: Likely Mold Allergy, Not Plant Disease

After cutting back a 30-year-old Photinia hedge and raking decades of dead leaves, an Oregon gardener experiences aches, chills, and appetite loss. Plant Not the Cause Photinia is not known to cause such symptoms. Photin

Key Lime Scale and Greening: Organic Approach with Atomic Grow

A Florida Keys grower sees canker and greening on key limes. Photos show scale insects and greening symptoms (fruit abortion). Expert Identification The canker is actually scale insects. Greening (HLB) causes fruit drop,

Hypoxylon Canker on Pin Oak: Stress-Induced Decline

A large pin oak in southeast Kansas shows dying limbs, brown leaves, and round gray patches on limbs after two years of drought. Diagnosis: Hypoxylon Canker This fungal disease (Hypoxylon spp.) is a secondary invader—it

Organic Rose Scale Control: Soaps, Oils, and Peppermint

A gardener with rose scale on 13 own-root roses wants non-chemical control. Asks if cutting canes to ground level will eradicate scale. Cutting Back Wont Work Scale insects overwinter on canes and in soil; cutting to gro