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Plant Pathology
Pests and Diseases in Orchids

The common pests of Orchids are Ants, Aphids, False Spider Mite, Leaf Hopper, Leaf Miner, Mealy Bugs, Mollusks, Red Spider Mite, Rodents, Scale insects, Thrips, Weevils. The common diseasesof Orchids are Basal rot / damping off, Bacterial brown spot, Brown rot, Black rot, Root rot, Leaf Spotting. The common viruses of Orchids are Sooty mould, Cymbidium mosaic, Tobacco mosaic and yellow bean mosaic, Odontoglossum ringspot virus.


Image of LeafhoppersLeafhoppers are found all over the world and constitute is the second-largest family in the Hemiptera (plant-feeding insects). They have at least 20,000 described species. Leafhoppers feed by sucking the sap of vascular plants, and are found almost anywhere such plants occur, from tropical rainforests, to arctic tundra.

Litchi stem-end borer (Conopomorpha sinensis)

Image of Litchi stem-end borer (Conopomorpha sinensis)Major insect pests of lychee are lychee stem-end borer (Conopomorpha sinensis), lychee mid vein borer (C. litchiella), aphid (Aphis gossypii and Toxopleura sp.), lychee stink bug (Tessaratoma papillosa), small green beetle (Platymycterus sieversi) and lychee erinose mite (Eriophyes litchi).

Shoot Borer (Chlumetia transversa)

Image of Shoot Borer(Chlumatia transversa)Shoot Borer (Chlumetia transversa) is a serious pest of mango (especially seedlings and young trees) that eats developing leaves and tunnels into the midrib and terminal shoots. This pest is found all over the country. Larvae of this moth bore into the young shoot resulting in dropping of leaves and wilting of shoots. Larvae also bore into the inflorescence stalk.


Image of BagwormThe larvae of the Psychidae or Bagworms construct cases out of silk and environmental materials such as sand, soil, lichen, or plant materials. These cases are attached to rocks, trees or fences while resting or during their pupa stage, but are otherwise mobile.

Azalea lace bug

Image of Azalea lace bugAzalea lace bug, Stephanitis pyrioides (Scott), belongs to a group of insects in the family Tingidae. The insects in this family generally live and feed on the underside of leaves. The young nymph lace bug is nearly colorless at hatching but soon turns black and spiny. It sheds its outer skin six times and ranges in size from 0.4 mm to 1.8 mm before becoming an adult.

Walnut caterpillar

Image of Walnut caterpillarThe walnut caterpillar is a relatively common insect in hardwood forests of eastern North America. It  is a serious threat to pecan, hickory and walnut trees. It also endangers oak, willow, honey locust and certain woody shrubs. Adult walnut caterpillars are found throughout the spring and summer. The females deposit eggs in masses on the undersides of the leaves.

Oystershell scale

Image of Oystershell scaleThe oystershell scale is one of the most common armored scale insects that cause injury to shade trees and shrubs. Ash, cotoneaster, dogwood, lilac, poplar and willow are most commonly infested. Oystershell scales attach themselves to the bark of twigs and branches.

Japanese beetle

Image of Japanese beetle

The beetle species Popillia japonica is commonly known as the Japanese beetle. It is about 1.5 cm (0.6 inches) long and 1 cm (0.4 inches) wide, with iridescent copper-colored elytra and green thorax and head. It is not very destructive in Japan, where it is controlled by natural enemies.

Gypsy moth

Image of Gypsy mothThe gypsy moth (Lymantria dispar) is a moth in the family Lymantriidae of Eurasian origin. It is a non-native, invasive species that has been advancing into Ohio from Pennsylvania and Michigan over the past decade. Although white, chestnut, black and red oak are preferred.

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