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Plant Pathology

Image of CankerwormsCankerworms are classified in the phylum Arthropoda, class Insecta, order Lepidoptera, family Geometridae. Cankerworm, name for two destructive inchworms, or larvae of geometrid moths. The spring cankerworm (Paleacrita vernata) and the fall cankerworm (Alsophila pometaria) are named for the seasons at which the adults emerge from underground pupation.

Calico scale

Image of Calico scaleThe calico scale (Eulecanium cerasorum) is species of scale insect. It is a common pest of a variety of woody landscape plants. It does not usually kill its host plant, however, it can severely weaken the plant, making it more susceptible to woodborers, drought and other stresses. Calico scale can be spread by windblown crawlers orcarried on the feet of birds between plants. They can also be spread by infested nursery stock.

Poplar and willow borer

Image of Poplar and willow borerPoplar Borer (Paranthrene dollii) is a moth which attacks poplar species (mainly black cottonwood, balsam poplar, and hybrid poplars). Trembling aspen and paper birch are rarely attacked. Causes: Upper crown or whole tree broken over or dead; Irregular splits and holes in the bark, through which red-brown and white shavings exude; Piles of shavings around the base of the stems.

Forest tent caterpillar

Image of Forest tent caterpillarThe forest tent caterpillar (Malacosoma disstria) is the larva of a North American moth. It has been recognized as an important defoliator of a wide variety of deciduous hardwood trees throughout its range for many years.  This forest tent caterpillars spin silken mats on the trunks and large branches where they congregate to molt or rest from feeding.

Eriophyid mites

Image of Eriophyid mitesEriophyid mites are very tiny, white or yellowish, worm-like, and spindle-shaped. Their bodies have definite annulations or rings, and only two pairs of legs directly behind the mouthparts. Most trees and shrubs have species that attack them and almost always create predictable damage like galling, etc.

Clearwing borers

Image of Clearwing borersClearwing borers (family Sesiidae) attack a wide variety of shrubs, trees, vines and herbaceous plants. They are major pests of fruit trees, shade trees, landscape plants, and certain forest trees. Many of these species cause serious damage, but the damage is often overlooked or underestimated because the symptoms may resemble plant diseases or weakness caused by drought.


Image of AphidsAphids are small plant-eating insects. Aphids are among the most destructive insect pests on cultivated plants in temperate regions. Plants exhibiting aphid damage can have a variety of symptoms, such as decreased growth rates, mottled leaves, yellowing, stunted growth, curled leaves, browning, wilting, low yields and death. The removal of sap creates a lack of vigour in the plant, and aphid saliva is toxic to plants.

Litchi erinose mite (Eriophyes litchii)

The Litchi erinose mite (Eriophyes litchii) is a tiny pest (1/200 inch [0.13 millimeter] long) that cannot be seen without a microscope, but its damage on lychee is distinctive and often extensive. Leaflets become curled and distorted and have a velvety brown appearance.

Litchi brown blight (Peronophthora litchi)

Image of Litchi brown blight (Peronophthora litchi)Litchi brown blight is a disease of lychee, causing browning of flowers and dessication of panicles  attacking young and ripe fruits causing brown lesions and white downy growth or premature fruit drop. The disease is the most important disease of lychee. The litchi brown blight disease examined in this import risk analysis is caused by Peronophythora litchii.

Anthracnose (Colletotrichum gloeosporioides)

Image of Anthracnose (Colletotrichum gloeosporioides)Anthracnose  (Colletotrichum gloeosporioides) is known to infect a wide variety of hosts. Some of the most important diseases that infect tropical fruits and cause major losses include anthracnose (caused by Colletotrichum gloeosprioides Penz.).

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