• WordNet 3.6
    • n defoliation causing the leaves of trees and other plants to fall off (as by the use of chemicals)
    • n defoliation the loss of foliage
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Webster's Revised Unabridged Dictionary
    • defoliation the act or process of causing plants to lose their leaves, especially by application of a chemical agent.
    • n defoliation The separation of ripened leaves from a branch or stem; the falling or shedding of the leaves.The deliberate defoliation of plants has been used in war (as in Vietnam) to deprive an enemy of cover and allow attack from the air; also, to destroy narcotic-producing plants as a tactic against illegal drug production. The chemical defoliating agents are often sprayed over large areas from airplanes.
    • ***
Century Dictionary and Cyclopedia
    • n defoliation Loss of leaves, as by the depredations of insects; specifically, the fall of leaves in autumn.
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Chambers's Twentieth Century Dictionary
    • ns Defoliation the falling off of leaves: the time of shedding leaves
    • ***


Webster's Revised Unabridged Dictionary
LL. defoliare, defoliatum, to shed leaves; L. de-, + folium, leaf: cf. F. défoliation,
Chambers's Twentieth Century Dictionary
Low L. defoliāre, -ātumde, off, folium, a leaf.


In literature:

Several successive defoliations are liable to kill a tree.
"Studies of Trees" by Jacob Joshua Levison
The aphids were very numerous and unfortunately caused the defoliation of all the currants with the exception of the blacks.
"Trees, Fruits and Flowers of Minnesota, 1916" by Various
Many small trees have been entirely stripped and large ones almost defoliated.
"Northern Nut Growers Association Report of the Proceedings at the" by Various
They are a great annoyance, and have defoliated whole vineyards here last fall.
"The Cultivation of The Native Grape, and Manufacture of American Wines" by George Husmann
Shrunken kernels are a logical result of early defoliation.
"Northern Nut Growers Association Thirty-Fourth Annual Report 1943" by Various
Very often this premature defoliation results in the production of a new crop of leaves and some shoot growth.
"Northern Nut Growers Association Report of the Proceedings at the Thirty-Eighth Annual Meeting" by Northern Nut Growers Association
When neglected for two or three years, they often defoliate large trees.
"Soil Culture" by J. H. Walden
Their labour often results in the complete defoliation of the tree.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2" by Various
Defoliation, 109, 240, 244.
"Disease in Plants" by H. Marshall Ward

In news:

AMVAC Chemical Corp. Has acquired the cotton defoliant product tribufos from Bayer CropScience.
Has acquired the cotton defoliant product tribufos (sold under the trade name Def) from Bayer CropScience.
Mystery defoliation at treeline in the Kenai Mountains.
Calamagrostis canadensis, a native grass, thrives under an aspen canopy opened up after defoliation by larvae of the aspen leaf-miner.
Defoliation hits soybean fields.
Nebraska soybean growers may be noticing soybean defoliation in their fields.
Defoliation sparks forest fire.
The process of manufacturing Agent Orange, a chemical defoliant used during the Vietnam War, produces dioxins , a class of chemicals linked to cancer and other diseases.
Downy Mildew (fungus – Peronospora sparsa) is a highly destructive disease on roses, causing severe and rapid defoliation.
People are noticing and asking what is up with the defoliation of eucalyptus trees lately.
Downy Mildew (fungus – Peronospora sparsa) is a highly destructive disease on roses, causing severe and rapid defoliation.
Seven acres of poplar and willow trees defoliated by satin moths were recently discovered in the Spooner Lake area.
The forest tent caterpillar is native to Minnesota and is the one that can defoliate millions of acres in Northern Minnesota.
"If you don't like the weather, wait five minutes," locals joke about the sudden hot and cold fronts that blow through, frequently defoliating plant and human life.
Because he served in the US Army in South Vietnam during 1968 and '69, during a period of heavy spraying of the toxic defoliant Agent Orange, Uncle Sam pays his medical bills.

In science:

Note on gynandromorphism in the eucalyptus defoliator thyrinteina arnobia (stoll, 1782) (lepidoptera: Geometridae).
A Developmental Network Theory of Gynandromorphs, Sexual Dimorphism and Species Formation