The Crush April2022 - 4

Neonics Regulation & PD/GWSS
by Michael Miiller
The California Department of Pesticide Regulation (DPR)
has proposed new restrictions, Neonicotinoid Pesticide
Exposure Protection, (DPR Regulation No. 22-001), on the use
of neonicotinoids (neonics) for a number of commodities,
including winegrapes. The proposed regulations would add
restrictions to existing uses of neonicotinoids, including
restrictions on application rates, application timing, and seasonal
application rate caps, to protect pollinator health. Affected active
ingredients include clothianidin, dinotefuran, imidacloprid, and
In addition to limiting uses of an important category of crop
protection tools for growers, DPR's proposal would hinder the
ability of the California Department of Food and Agriculture's
Pierce's Disease Control Program to manage the spread
of glassy winged sharpshooter (GWSS), the primary vector
for Pierce's disease (PD). The use of neonics for area-wide
treatments to manage high numbers of GWSS has been an
integral part of the success of the Pierce's Disease Control
Program in limiting the spread of PD.
The proposed regulation would limit the number and rate of
neonic applications to treat GWSS, mealybugs and potential
future pest threats, like the spotted lanternfly. Neonics work
by targeting the nervous system of insects, and by restricting
the number of potential applications and the rate of active
ingredient applied, the proposed regulations may render
the products ineffective in managing pests like GWSS. To
preserve the effectiveness of neonics, CAWG is leading a
wine industry coalition that seeks to exempt treatments of
pests regulated or designated under the Pierce's Disease
Control Program from DPR's proposed regulation.
In Southern California and the San Joaquin Valley, GWSS
typically produce two generations. Where populations of
GWSS are high, neonics, like imidacloprid, provide the
longer-term residual effect necessary to control the pest.
When use of soil-applied imidacloprid was registered in
California, the Pierce's Disease Control Program was able to
obtain effective control of GWSS for up to 2 - 3 months after
The use of neonics to suppress GWSS populations in citrus
orchards is an integral component of
the Pierce's Disease Control Program.
GWSS is not a pest of concern for citrus
growers, so the Pierce's Disease Control
Program has reimbursed citrus growers
for neonic applications as part of areawide
treatments activities. Treatments
of citrus orchards have proven essential
in limiting the spread of GWSS and
protecting nearby vineyards. DPR's
regulation threatens this aspect of the
Citrus growers have their own concerns
with DPR's regulation, as neonics are important for the
control of Asian Citrus Psyllid (ACP).
The advent of neonics helped lessen reliance on an older
generation of less selective pest control products like
carbamates, organochlorine, and organophosphorus
compounds, and many uses of these compounds have
been prohibited or severely restricted. If the use of neonics
is heavily restricted, growers may need to turn to other
products like pyrethroids. Pyrethroids can be effective, but
they have limited residual value for controlling pests like
Get Involved
DPR's proposed regulation threatens the effectiveness of the
Pierce's Disease Control Program and to increase costs for
managing damaging vineyard pests throughout California.
Growers are encouraged to submit comments to DPR by
e-mailing a letter asking that any pest regulated or designated
under the Pierce's Disease Control Program be exempt from
regulation under the proposed rule. The public comment period
closes at 5:00 p.m. on April 26, 2022. Growers are also encouraged
to participate at a public hearing scheduled for Monday, April 25,
>> Submit Public Comment
Page 4 | April 2022

The Crush April2022

Table of Contents for the Digital Edition of The Crush April2022

The Crush April2022 - 1
The Crush April2022 - 2
The Crush April2022 - 3
The Crush April2022 - 4
The Crush April2022 - 5
The Crush April2022 - 6
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