May 2019 - 37
PLANT HEALTH
control. The contact information for Cindy Mckenzie's USDA lab in
Florida where samples can be sent to identify biotypes is at the end of
this article. Scouting and applying insecticides early before populations
have reached damaging levels is best practice. It is easier to control
a small infestation, treating when numbers are low. Treating early and
maintaining low numbers by repeating applications as needed puts less
selective pressure on the population of whiteflies you have present.
WITH A LARGE POPULATION:
There is a greater chance of multiple individuals being less
susceptible and surviving control measures or, in the case of Q biotype,
demonstrating resistance to the applied product.
This could result in a population where we are selecting for harder
to control insects and possibly shifting the population towards more Q
biotype further limiting the effective chemical options.
To keep population numbers low and reduce your selection pressure
for resistance, choose products with different modes of action and
create a rotation program that works for you. The Insecticide Resistance
Action Committee (IRAC) assigns every insecticide to a mode of action
group based on the exact location in an insect where the compound is
active, also called the target site. These IRAC group numbers are now
listed on the first page of most product labels. Consulting your local
extension for recommended products based on activity for sweet potato
whitefly and then selecting multiple IRAC group numbers or modes of
actions is a good way to begin building a rotation program.
By rotating products, we are exposing insects to different chemical
classes as well as acting on different target sites. This variety reduces
Mixed generation of whitefly nymphs.
the selection pressure for less susceptible individuals and helps to
prolong the effectiveness of our chemical tools.
It is recommended to use at least three products in your rotation
and remember not to apply more than two sequential applications
before rotating. There are a number of other considerations to take into
account when developing your rotation program.
* When choosing a product, is it labeled for indoor or outdoor use?
* Does the use of neonicotinoid products in the program raise selling
concerns or are they restricted by retailer customers?
Whether you're shipping or receiving, we know you are busy...
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May 2019
Table of Contents for the Digital Edition of May 2019
May 2019 - 1
May 2019 - 2
May 2019 - 3
May 2019 - 4
May 2019 - 5
May 2019 - 6
May 2019 - 7
May 2019 - 8
May 2019 - 9
May 2019 - 10
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May 2019 - 52
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