Gypsy moths: unwelcome guests with big appetites - using natural controls to prevent annual defoliation
Flower & Garden Magazine, August-Sept, 1994
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Defoliation - the loss of foliage due to unnatural causes, such as chemicals, frost, or high winds.
Dermal tissue system - The protective covering of plants. In juvenile plants it is composed of a single layer of epidermal cells.
defoliation The unnatural loss of a plant's leaves, generally to the detriment of its health. Can be caused by high winds, excessive heat, drought, frost, chemicals, insects, or disease.
Defoliation
When the leaves fall off your plant too early. Can be caused by lack of water, insects, or plant diseases.
Dig In
To churn the soil with a spade or shovel, so that the added material is well mixed in to the base soil.
Defoliate/defoliation Loss of leaves such as premature summer leaf drop; casting off or falling off of leaves.
Dehiscent Opening to discharge the seeds or pollen.
Deliquescent Breaking up into fine branches.
Rapid defoliation:
Rapid changes in temperature or light... Was plant moved to a new location?
Overwatering possible... Check for root damage or rot
Underwatering... Provide enough water to support full foliage
Exposure to hot or cold drafts ...
This moth's larvae spin unsightly baglike shelters in tree canopies and can cause serious damage through defoliation. Typical control methods include mechanical removal of the bagworm shelters (when feasible) and the application of pesticides.
Defoliation of trees in several successive seasons may result in their death. Spores of the leaf curl fungus survive the summer, fall and winter months on bud scales, on twigs and on fallen, infected leaves.
When lesions occur on petioles, the leaves turn yellow and 50 percent or more defoliation may occur. Severe defoliation leads to premature fruit drop.
Defoliation The loss of a plant's leaves due to an unnatural cause such as wind, drought, early frost, chemicals, insects, or disease. Dethatch Remove the dead stem build-up beneath lawn grasses.
Severe infection may produce a variety of effects, including defoliation, dieback, severely blemished fruit, reduced fruit quality, and premature fruit drop.
Appearance and Strains ...
Anthracnose fungi may cause defoliation of most maple, oak, elm, walnut, birch, sycamore, and hickory species and, occasionally, of ash and linden trees. Damage of this type usually occurs after unusually cool, wet weather during bud break.
A light population may not cause serious damage, but moderate to heavy populations can cause serious defoliation, which significantly impacts tree health. The aim of control is to stop defoliation before it becomes too extensive.
As you become comfortable with pruning and wiring, try defoliation (cutting out some or all of the tree's leaves during the summer in order to reduce leaf size), ...
In high-stress situations, such as extremely high or low temperatures, defoliation, drought, or underfertilization, tissues can become hard and white. Ocassionally green tissue also forms, says J. W. Scott, Ph.D.
The plants have sustained only minor defoliation and there are loads of berries ripening on the bush. On a positive note, the presence of the currant worm on the possible black currant bush proves that it is definitely some kind of currant.
- Chew marks on outer edges of leaves
- Complete defoliation
- Curled leaves
- Discolorations on leaves
- Holes in leaves
- Wilting with discoloration ...
Do not spray other plants with zinc at the rates used on pecans since leaf burn and defoliation may occur. Zinc nitrate is least likely to cause burn to other plants in the landscape.
There are some antidesiccant products you can spray on your tree to help slow the drying process. But if they're not used properly, some of them leave a residue and may cause premature defoliation (loss of leaves or needles).
Infected blossoms drop; small, dark spots form on leaves, which yellow and drop. This defoliation weakens plants and exposes developing fruits to sunscald. Very warm, wet weather encourages the development of the disease.
Lime sulfur should be avoided on sulfur sensitive plants when leafed out such as grapes, apple, pear, blueberry, currants, gooseberry, apricot, brambles and vine crops. Damage include scorching, dwarfing of leaves, premature defoliation and reduced ...
They eat developing shoots and flower buds by piercing the plant's surface and sucking out the plant's juices, which can result in deformed buds, flower loss and even defoliation of the plant. They do not just affect roses.
In fact, Louis XIV's gardeners used an extreme form of this method to keep the monarch happy. By starving citrus to the point of defoliation and then applying water, they would trick the orange trees into bursting into bloom year-round.
Canes that show severe spots upon them should be pruned out and discarded. Left untreated Spot Anthracnose will have the same effect as a major outbreak of black spot fungus, causing severe defoliation of the rose bush or rose bushes infected.
 See also: Plant, Leaf, Spring, Water, Insect
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