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Walnut
> Year-Round IPM Program > In-Season
Activities > Why
Is This Season Important?
Walnut
 Why
Is the Nut Development Period Important in an IPM Program?
The nut development period is an important period
for the monitoring and management of many walnut pests such as
walnut blight, codling moth, walnut scale, aphids, spider mites,
walnut husk fly, and weeds in an IPM program.
It is important to maintain the walnut blight and codling moth
management programs throughout the fruit development period.
If decisions are made to treat for codling moth, use treatment
options that do not pose water quality problems such as mating
disruptants, insect growth regulators, and other reduced risk
pesticides.
Because the husks of some walnut varieties crack before harvest,
they are often more vulnerable to navel orangeworm
damage. Planning a prompt harvest after husk
split is
an important way to limit navel orangeworm infestations in walnuts.
Where navel orangeworm is a major problem, plan on an early and
rapid harvest. Growth regulators can be applied to advance husk
split. Also note, that after husk split, husk flies no longer
pose a problem.
Programs that rely on natural enemies, cultural practices, and
lower-risk pesticides pose fewer water quality and environmental
risks than programs that rely on organophosphate or pyrethroid
insecticides.
For more information on monitoring and management see the individual
pest sections of the Walnut
Pest Management Guidelines.
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