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These days everybody sends cards and defoliates a rainforest in the process.
The psyllid damages the leaves by drawing sap, which defoliates the trees and can lead to its death.
Unfortunately, almost all these new hybrids inherited a trait besides yellow color: susceptibility to black spot, a pernicious leaf disease that defoliates and sometimes kills the plant.
The decision to not undertake an aerial spraying program in 2003 comes after several years of sharply declining gypsy moth populations, during which a naturally occurring fungus has proved deadly to the insect that defoliates certain hardwoods.
A boy astride the sole tree in a grassy island all but engulfed by asphalt and concrete defoliates it leaf by leaf in anticipation of the fall: "My father thinks its a good idea .