Your Trees Resist Pests
property, insects and microorganisms abound. This is a natural
and bene─cial state, since insects and microorganisms are
key components in nutrient recycling, decomposition, plant
succession and natural pest control, and wildlife habitat.
Periodic outbreaks of destructive tree insect pests, as well
as diseases, occur as part of natural ┼uctuations in ecosystems.
The actions of homeowners make these outbreaks more severe
or lessen their impact locally. To promote a healthy landscape
and to prevent pest outbreaks, take steps to ensure diversity
and vigor on your property.
Many property owners have lots with just a single or a few
trees. Others have small backyard woods, which have become
an important component of the urban environment. Small woodlands
with a mix of tree species are often less susceptible to pest
outbreaks than woods with a single species.
A diversity of tree ages also reduces the risk of pest outbreaks.
As with species diversity, age diversity increases the complexity
and stability of the ecosystem. A natural balance of organisms
is more likely to develop as age diversity increases. For
example, potential pests of young trees could be regulated
by parasites and predators already well established on older
“A healthy landscape is less susceptible to pest outbreaks
and is more resilient if an outbreak does occur,” stresses
Peter Grestenberger, senior advisor for safety, compliance
and standards for the Tree Care Industry Association. “When
trees are overcrowded in your landscape, competition for light,
water and nutrients results in increased stress. Trees under
stress are more likely to be attacked by pests.
The ─rst clues of a tree health problem may be symptoms like
yellowing needles or leaves, thinning foliage or dieback on
upper limbs. Insect pests or disease pathogens may cause these
problems; or they may arise from factors like soil problems,
construction damage, drought, pollution or herbicide injury.
For more information please contact your local tree care specialist
A Tree Care Industry Association Article
Ynez Valley Tree Care
P.O. Box 1147, Santa Ynez, California 93460
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