Trumpet Creeper (Campsis radicans) Care Guide

Root-knot nematodes (Meloidogyne species) are microscopic roundworms that parasitize plant roots, causing characteristic galls or knots. These soil-borne pests are among the most economically damaging plant pathogens worldwide, affecting a wide range of ornamental and edible plants. The nematodes inject enzymes into root cells, causing abnormal swelling and disrupting water and nutrient uptake.

Powdery mildew is a common fungal disease caused by various fungi species including Erysiphe, Podosphaera, Oïdium, and Leveillula. It affects over 10,000 plant species worldwide. The disease thrives in warm, dry climates with high humidity and appears as a distinctive white powdery coating on plant surfaces.

Black spot is the most serious fungal disease affecting roses, caused by the fungus Diplocarpon rosae. It is characterized by dark circular spots on leaves that progress to yellowing and premature leaf drop. The disease thrives in humid and cool conditions, especially early in the growing season.

Cercospora leaf spot is a common fungal disease caused by Cercospora species that affects many plant types, particularly beets, roses, and leafy vegetables. The disease thrives in warm, humid conditions and can cause significant defoliation, reducing plant vigor and yield. It spreads rapidly through water splash, wind, and contaminated tools.

Phyllosticta is a genus of fungi responsible for leaf spot diseases in a wide range of garden and indoor plants. These pathogens thrive in warm, humid conditions, spreading primarily through water splash and prolonged leaf wetness. Symptoms typically include small, circular lesions that transition from tan or light brown to having distinct dark brown or black margins. As the disease progresses, these spots may coalesce, leading to chlorosis (yellowing) and premature abscission (leaf drop). Characteristic pycnidia—tiny, black, pinhead-sized fruiting bodies—often develop within the lesions. Phyllosticta commonly affects ornamentals like hydrangeas, irises, peonies, lilacs, maples, and roses, as well as citrus and various fruit trees.

Scale insects are small sap-sucking pests that appear as brown, shell-like bumps on plant stems and leaves. There are over 25 species, divided into armored (hard) and unarmored (soft) scales. They feed by piercing plant tissue and extracting sap, which weakens the plant and can lead to yellowing, stunted growth, and even death if left untreated. They also excrete honeydew, which attracts ants and promotes sooty mold growth.