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 ?
Manual defoliation was performed at the beginning of maturation and 15 days after the date of first defoliation up to the height of bunches, and 6 leaves per cane were collected.
Cottonwood leaf beetle (Coleoptera: Chrysomelidae) defoliation impact on Popolus growth and above-ground volume in a short-rotation woody crop plantation.
After the emission of the first truss, the practice of defoliation was started, and this was done periodically throughout the growing cycle immediately after the emission of each new truss (Figure 1).
Water availability influenced stomatal conductance as a function of the defoliation level, showing a very similar behavior in both evaluation periods (Figures 2A and B).
In tropical conditions, the defoliation of banana 'Nanica' did not affect bunch mass and fruit size (VARGAS et al., 2009; GONZALEZ et al., 2012); however, in subtropical, there was a reduction in plants with less than 10 leaves (DANIELLS et al., 1994).
It was studied the frequency and intensity of defoliation when heifers were kept exclusively in Italian ryegrass or in Italian ryegrass receiving supplement: a commercial extruded product with fat, in a proportion of 0.20% of body weight (fat) or corn grain in a proportion of 0.78% of body weight (corn).
Defoliation was estimated counting the number of nodes in the main stem with and without leaves at the very moment and sampled in the date of each severity evaluation.
Formation of annual rings of the main coniferous tree species in Siberia after defoliation of crown by Dendrolimus superans sibiricus Tschetv, Khvoinye Boreal'noi Zony 26(2): 161-172.
Data Analysis--We compared sample population levels for each of the three targeted species between sampling sites, months, and years, as well as the level of tamarisk defoliation using One Way Analysis of Variance on Ranks.
The sub plot treatments were 0 % defoliation (no defoliation), 25 % defoliation and 50 % defoliation.
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