Powdery Mildew is a fungal disease that can affect many common plants in both wet and dry conditions, but is most prevalent in cool, dry weather with high humidity. Powdery Mildew spores require dry conditions to spread and are suppressed by excess moisture.
Rust (Ornamentals & Edibles)
Ornamental Rust is a fungal disease that affects ornamental and edible plants in wet and humid conditions. It is caused by many different species of fungi in the genus Puccinia. Some types infect only one type of plant.
Aphids are very small, pear-shaped soft-bodied insects that commonly infest many garden plants, especially roses and vegetables. Often called "Plant Lice", they range from less than 1/8 to 1/4 inch long. An aphid comes in many colors, but green, black and yellow are common.
Cottony Cushion Scales
Cottony Cushion Scales are a soft scale insect. They get their name and appearance from the hundreds of white waxy egg sacks that mature females attach to their bodies.
Leafhoppers are small, wedge-shaped hopping insects. Adults are about ¼ inch long and slender. They range in color from green to brown and yellow. They have a distinctive "sideways" walking movement and are excellent flyers. Their eyes are on the side of their head, and they have piercing mouthparts. They are found throughout home gardens.
Mealybugs are scale-like insects with a white, waxy protective covering that makes infested plants appear to be covered in cotton. These pests are tiny – from 1/32 to 1/8 inch long – but are very hard to control because of the wax-like threads they cover themselves with.
Scale is a name applied to 8,000 different species of insects. While they vary greatly in appearance, Scales are significant crop and tree pest. Female Scales develop a protective covering, and become immobile (sessile) and attached to the plant they are feeding on.
Spider Mites are very tiny arachnids; adult females are about 0.4mm long. They have four pairs of legs and a pair of needlelike stylets (mouth parts) they use to pierce plant tissue and suck juices.
Thrips are tiny (1/16 inch long) slender sucking insects that are yellow, brown or black with fringed wings.
You will see whiteflies on plants as tiny (1/16 inch), white, four-winged, fly-like insects that usually congregate on undersides of leaves. White flies often swarm in clouds when disturbed.