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Damaging Insects & Diseases
Lace Bug

Lace Bug

Lace Bugs are small (1/8 inch) insects. The adults have delicate, clear wings that they hold over their bodies. They commonly feed on azaleas, sucking the cell contents from the underside of the leaves, producing a mottling or speckling on the upper surface. There are many species of lace bugs. The most common is the (Stephanitis) on Azaleas and Rhododendrons.
Leaf Miner

Leaf Miner

A leaf miner is the larva of an insect that lives in and eats the leaf tissue of plants. They feed by creating shallow tunnels, or mines, in young leaves of citrus trees. The damage is unsightly, and if left untreated, can end up causing serious damage to a plant.
Leaf Spot

Leaf Spot

Leaf spot is a common descriptive term applied to a number of diseases affecting the foliage of ornamentals and shade trees. The majority of leaf spots are caused by fungi, but some are caused by bacteria. Leaf spot may result in some defoliation of a plant.
Mole

Mole

Moles are small grey to black mammals with fine velvety fur. They have hairless snouts and inconspicuous eyes and ears. Their eyesight is poor but they have superior senses of smell, touch and hearing. Their front feet are much larger than their hind feet and have long trowel-like claws used for tunneling in the ground. Moles live in burrows made up of many interconnecting runways that are usually about 6-8 inches underground.
Powdery Mildew

Powdery Mildew

Powdery mildew is probably the most familiar plant disease. Unlike most other fungus diseases of plants, it grows on the outside of leaves, forming a gray or white “powder”. Also, unlike other fungus diseases, which only infect wet leaves, powdery mildew invades dry leaves as well.
Pythium

Pythium

Symptoms of Pythium blight are evident during warm, humid weather when turfgrass leaves are wet for at least 12 hours. The disease is particularly severe when daytime temperature exceed 82 degrees F and night temperature fail to fall below 68 degrees F. Initial symptoms appear as dark green to purple water-soaked leaves that aggregate into circular or irregularly shaped patches in turfgrass. Patches of infected grass can enlarge causing severe damage to lawns.

Rust Spot

Rust Spot

The rusts are amongst the most common fungal diseases of garden plants. Trees, shrubs, herbaceous and bedding plants, grasses, bulbs, fruit and vegetables can all be affected. Rust diseases are unsightly and often reduce plant vigor. In extreme cases, rust infection can even kill the plant.
Scale

Scale

There are many different varieties of scale. Scale resembles bumpy bark or fine ash on branches of trees and shrubs. Wherever they feed, they cause a reddening of tissue, usually several times the diameter of the scale. The removal of sap by thousands of scales is what causes the damage.
Shothole

Shothole

Shothole disease starts as brown spots on the leaves. As the leaves expand, the brown areas fall out leaving holes scattered over the leaf surface.
Slime Mold

Slime Mold

Slime mold is a broad term describing some organisms that use spores to reproduce. They feed on microorganisms that live in any type of dead plant material. They contribute to the decomposition of dead vegetation, and feed on bacteria, yeasts and fungi.
Snow Mold

Snow Mold

Snow mold is a type of fungus and a turf disease that damages or kills grass after snow melts, typically in late winter. Its damage is usually concentrated in circles three to twelve inches in diameter.
Sooty Mold

Sooty Mold

Sooty mold can be found on a variety of plants. It is caused by any of several fungi that are left on plants by aphids, scale, and other insects that suck sap from the plant. Sooty molds are unsightly, but fairly harmless because they do not attack the leaf directly.
Spider Mites

Spider Mites

Spider mites are among the most serious pests of ornamental plants. They feed on the underside of the leaves by sucking the juice out of the tissue. Because of the small size and the fact that the suck from the underside of the leaves, they are often overlooked until serious damage occurs.
Spittle Bug

Spittle Bug

Spittlebugs cause sporadic damage to warm-season turf grasses. The nymphs feed from inside conspicuous masses of frothy white spittle formed in the turf. Adults are dark colored with two reddish stripes across their back.
Whitefly

Whitefly

Whiteflies are small hemipterans that typically feed on the undersides of plant leaves. They tap into the phloem of plants, introducing toxic saliva and decreasing the plants’ overall turgor pressure.
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