Defoliation


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Defoliation

 

the preharvest removal of leaves from plants to facilitate the mechanical harvesting of a crop. Defoliation is accomplished through the use of chemical agents (defoliants) that stimulate processes in plants similar to those taking place during the natural aging of leaves. Spraying cotton with defoliants after one to three bolls have opened stimulates the leaves to fall and hastens the ripening of the unopened bolls. The defoliation of ornamental plants, fruit trees, and plants of the genus Eucommia also produces good results.

References in periodicals archive ?
During defoliation, the leaf blade was severed with a scissors at the point of attachment to the petiole; one-fourth of the leaves were removed (25% defoliation) and half (50% defoliation).
Notes on the defoliation of coconut palm (Cocos nucifera) by the butterfly Opsiphanes quiteria quirinus in northeastern Cost Rica.
citri causes direct damage such as deformations of growing leaves , shoot drying, defoliation, and the presence of sooty mold (Hodkinson 1974; Aubert 1987; Michaud 2004), it is as a vector of the plant pathogens causing HLB that this psyllid has acquired major importance for citrus, becoming the main insect pest of this crop.
Higher number of ants, predatory bugs and spiders decreased the number of lepidopteran leaf miners and percent defoliation (Figs.
The result: virtually no damage--less than 1 percent defoliation.
25 acres planted with red-oak seedlings, replacing those lost to severe drought and gypsy-moth defoliation.
8 /PRNewswire-FirstCall/ -- DuPont and Etigra today announced that Etigra has acquired the DuPont Super Boll(R) brand ethephon trademark, registration and assets, as well as the DuPont FreeFall(R) brand thidiazuron cotton defoliation trademark.
Post release monitoring of the herbivore in Florida indicates that feeding by psyllids induces leaf senescence, eventually resulting in partial defoliation of mature trees and mortality of seedlings (Center et al.
Repeated defoliation eventually kills deciduous trees and a single defoliation kills conifers.
It is difficult to permanently alter the character of a soil, and I suspect it is the soil that is your undoing - a combination of poor drainage and excess salt, which could certainly bring on the constant defoliation you describe.
overall and in Pennsylvania, where more defoliation has occurred than in any other state.
In 2004, the state Department of Agriculture sprayed about 30,000 acres in eight counties, and in 2003 nearly 65,000 acres of defoliation occurred in the state.