Supplemental Label
EPA Reg. No. 59639-95
KNACK® INSECT GROWTH REGULATOR FOR USE ON BANANA AND PLANTAIN;
BERRIES; BULB VEGETABLES; LEGUME VEGETABLES (SUCCULENT OR DRIED);
PAWPAW; PINEAPPLE; POMGRANATE AND ROOT AND TUBER VEGETABLES
(Except California and New York)
DIRECTIONS FOR USE
It is a violation of Federal law to use this product in a manner inconsistent with its labeling.
THIS LABELING MUST BE IN THE POSSESSION OF THE USER AT THE TIME OF APPLICATION.
READ THE LABEL AFFIXED TO THE CONTAINER FOR KNACK INSECT GROWTH REGULATOR
BEFORE APPLYING. USE OF KNACK INSECT GROWTH REGULATOR ACCORDING TO THIS
LABELING IS SUBJECT TO THE USE PRECAUTIONS AND LIMITATIONS IMPOSED BY THE
LABEL AFFIXED TO THE CONTAINER FOR KNACK INSECT GROWTH REGULATOR.
Page 1 of 12
BANANA AND PLANTAIN
GENERAL: Knack Insect Growth Regulator acts by suppressing embryogenesis within the insect egg and by
inhibiting metamorphosis and adult emergence of target insects. Knack has no activity on adult insects, but
hatching of eggs laid by treated adults will be suppressed. Since Knack is an Insect Growth Regulator (IGR) and
activity depends on the insect’s development, evidence of activity will be slower than typical contact insecticides.
Knack does exhibit translaminar movement which means that Knack applied to the upper surfaces of the leaves will
move to the lower surface of the leaf. This translaminar movement is very important to chemical control of whitefly
since one of the major obstacles is getting the product to the underside of the leaves where whitefly are present.
PESTS
Banded Wing
Whitefly
Greenhouse
Whitefly
Silverleaf Whitefly
Sweetpotato
Whitefly
PRODUCT
RATES
PER ACRE
13 to 16 fl oz
SPECIAL INSTRUCTIONS
Apply with air or ground equipment in adequate water for uniform
coverage:
By air:
3 to 10 gals/A
By ground: 10 to 50 gals/A
HIGHER WATER VOLUMES MAY PROVIDE IMPROVED INSECT
CONTROL.
Begin applications when whiteflies reach threshold levels per
University/Extension recommendations (e.g. 3 to 5 adults per leaf and/or
equivalent levels of immatures).
Only whole fields should be treated.
Knack may be mixed and/or alternated with commonly used insecticides to comply with local Integrated Pest
Management (IPM) and Insect Resistance Management (IRM) programs.






Do not apply within 14 days of harvest.
Do not make more than 3 Knack applications per growing season.
Do not exceed 48 fl oz of Knack per acre per season.
Regardless of formulation do not exceed 0.327 lb pyriproxyfen per acre per season.
Do not apply earlier than 14 days after last Knack treatment.
Do not plant any crop other than those with registered pyriproxyfen uses in treated areas sooner than 30
days after the last application.
MANAGING INSECT RESISTANCE: Repeated use of the same class of insecticides or insecticides with similar
modes of action can lead to the buildup of resistant whitefly strains. To optimize resistance management
practices, Valent U.S.A. Corporation is restricting Knack Insect Growth Regulator to three applications per
growing season. Knack may be used in alternation with other IGR materials possessing dissimilar modes of
action and/or with other chemical classes of insecticides. Valent also does not recommend using rates below 13 fl
oz per acre for whitefly control because reduced rates can lead to a greater potential for resistance development.
Follow local, state and federal IPM and IRM recommendations. Read and follow all product labels before applying
any insecticide.
Page 2 of 12
BERRIES
GENERAL: Knack Insect Growth Regulator acts by suppressing embryogenesis within the insect egg and by
inhibiting metamorphosis and adult emergence of target insects. Knack has no activity on adult insects, but
hatching of eggs laid by treated adults will be suppressed. Since Knack is an Insect Growth Regulator (IGR) and
activity depends on the insect’s development, evidence of activity will be slower than typical contact insecticides.
CROPS
Blackberry including
Bingleberry
Black Satin Berry
Boysenberry
Cherokee Blackberry
Chesterberry
Cheyenne Blackberry
Coryberry
Darrowberry
Dewberry
Dirksen Thornless Berry
Himalayaberry
Hullberry
Lavacaberry
Lowberry
Lucretiaberry
Mammoth Blackberry
Marionberry
Nectarberry
Olallieberry
Oregon Evergreen Berry
Phenomenalberry
Rangeberry
Ravenberry
Rossberry
Shawnee Blackberry
Youngberry
Blueberry
Currant
Elderberry
Gooseberry
Huckleberry
Juneberry
Lingonberry
Loganberry
Raspberry, (black and red)
Salal
PRODUCT
RATE
PER ACRE
PESTS
Cherry Fruitworm
Cranberry Fruitworm
Lecanium Scale
16 fl oz
SPECIAL INSTRUCTIONS
Apply with ground or air equipment as a
full coverage spray (minimum of 5 gals/A
by air or 50 gals/A by ground). Thorough
coverage is critical for adequate control. It
is essential to use adequate water volume
to ensure thorough coverage.
Fruitworms: Apply when egg laying
begins and again at petal fall. Additional
applications of another insecticide, at 10 to
14 day intervals, may be needed under
high population pressure or sustained
moth flight.
Lecanium Scale: Apply at either dormant,
delayed dormant or an in-season cover
spray. At dormant or delayed dormant use
a spray oil at the manufacturer’s
recommended oil rate. In a cover spray
make applications when scale crawlers
first emerge. Follow local
recommendations regarding in-season use
and rates of oil in your area.
Knack may be mixed and/or alternated with commonly used insecticides to comply
with local Integrated Pest Management (IPM) and Insect Resistance Management
(IRM) programs.





Do not apply within 7 days of harvest.
Do not make more than 2 Knack applications per growing season.
Do not exceed 32 fl oz of Knack per acre per season.
Do not apply earlier than 14 days after last Knack treatment.
Regardless of formulation do not exceed 0.218 lb pyriproxyfen per acre per
season.
MANAGING INSECT RESISTANCE: Repeated use of the same class of insecticides with similar modes of
action can lead to the buildup of resistant insect strains. To optimize resistance management practices, Valent
U.S.A. Corporation is restricting Knack Insect Growth Regulator to two applications per growing season. Knack
may be used in alternation with other IGR materials possessing dissimilar modes of action and/or with other
chemical classes of insecticides. Follow local, state and federal IPM and IRM recommendations. Read and follow
all product labels before applying any insecticide.
Page 3 of 12
BULB VEGETABLES
GENERAL: Knack Insect Growth Regulator acts by suppressing embryogenesis within the insect egg and by
inhibiting metamorphosis and adult emergence of target insects. Knack has no activity on adult insects, but hatching
of eggs laid by treated adults will be suppressed. Since Knack is an Insect Growth Regulator (IGR) and activity
depends on the insect’s development, evidence of activity will be slower than typical contact insecticides.
CROPS
Garlic
Garlic, Great Headed
Leek
Onion, Dry Bulb
Onion, Green
Onion, Welsh
Shallot
PESTS
Onion Thrips






PRODUCT RATES
PER ACRE
8 fl oz
SPECIAL INSTRUCTIONS
FOR SUPPRESSION OF ONION THRIPS:
Apply with ground equipment in adequate water
for uniform coverage (20 to 50 gals/A). Begin
applications when thrips reach threshold levels
per University/Extension. Thorough coverage is
critical for adequate water volume to ensure
thorough coverage.
Do not apply within 3 days of harvest.
Do not make more than 2 Knack applications per growing season.
Do not exceed 16 fl oz of Knack per acre per season.
Do not apply earlier than 14 days after last Knack treatment.
Regardless of formulation do not exceed 0.134 lb pyriproxyfen per acre per season.
Do not plant any crop other than those with registered pyriproxyfen uses in treated
areas sooner than 30 days after the last application.
MANAGING INSECT RESISTANCE: Repeated use of the same class of insecticides with similar modes of action
can lead to the buildup of resistant insect strains. To optimize resistance management practices, Valent U.S.A.
Corporation is restricting Knack Insect Growth Regulator to two applications per growing season. Knack may be
used in alternation with other IGR materials possessing dissimilar modes of action and/or with other chemical
classes of insecticides. Follow local, state and federal Integrated Pest Management (IPM) and Insect Resistance
Management (IRM) recommendations. Read and follow all product labels before applying any insecticide.
Page 4 of 12
FRUITING VEGETABLES
GENERAL: Knack Insect Growth Regulator acts by suppressing embryogenesis within the insect egg and by
inhibiting metamorphosis and adult emergence of target insects. Knack has no activity on adult insects, but hatching
of eggs laid by treated adults will be suppressed. Since Knack is an Insect Growth Regulator (IGR) and activity
depends on the insect’s development, evidence of activity will be slower than typical contact insecticides.
Knack does exhibit translaminar movement which means that Knack applied to the upper surfaces of the leaves will
move to the lower surface of the leaf. This translaminar movement is very important to chemical control of whitefly
since one of the major obstacles is getting the product to the underside of the leaves where whitefly are present.
CROPS
PESTS
Fruiting
Vegetables:
Eggplant
Ground Cherry
Okra
Pepino
Pepper
Tomatillo
Tomato
Banded Wing Whitefly
Greenhouse Whitefly
Silverleaf Whitefly
Sweetpotato Whitefly
PRODUCT
RATES
PER ACRE
8 to 10 fl oz
Do not apply less
than 8 fl oz/A of
Knack when used
as a stand alone
application.
SPECIAL INSTRUCTIONS
Apply with air or ground equipment in adequate
water for uniform coverage:
By Air:…….….…..3 to10 gals/A
By Ground:……..10 to 50 gals/A
HIGHER WATER VOLUMES
IMPROVED INSECT CONTROL.
PROVIDE
Begin application when whiteflies reach
threshold levels per University/Extension
recommendations (e.g. 3 to 5 adults per leaf
and/or equivalent levels of immatures). Under
severe pressure, use the higher recommended
rates.
Only whole fields should be treated.
Banded Wing Whitefly
Cabbage Looper
Green Peach Aphid
Greenhouse Whitefly
(immatures & adults)
Silverleaf Whitefly
Sweetpotato Whitefly
Tobacco Hornworm
6 to 8 fl oz
+
Orthene® 75 S
0.66 to 1.33 lbs/A
or
Orthene 97
0.5 to 1.0 lb/A
Apply as a tank mix with ground equipment for
uniform coverage (25 to 150 gals/A by ground).
Make application when eggs or insects first
appear. If control is needed during this period,
use an alternate insecticide registered for the
target pest.
Knack may also be mixed or alternated with
commonly used insecticides to comply with
local IPM programs.
Comply with all applicable directions,
restrictions and precautions on the registered
labels for Orthene 75 S or Orthene 97.






Do not apply within 1 day of harvest.
Do not make more than 2 Knack applications per growing season.
Do not exceed 20 fl oz Knack per acre per season.
Do not apply earlier than 14 days after last Knack treatment.
Regardless of formulation do not exceed 0.109 lb pyriproxyfen per acre per season.
Do not plant any crop other than those with registered pyriproxyfen uses in treated areas
sooner than 30 days after the last application.
continued
Page 5 of 12
FRUITING VEGETABLES (continued)
CROP
Fruiting
Vegetables:
Tomato
PESTS
Banded Wing Whitefly
Beet Armyworm
Fruitworm
Greenhouse Whitefly
(immatures & adults)
Potato Aphid
Silverleaf Whitefly
Sweetpotato Whitefly
Thrips
Tomato Pinworm
Yellowstriped Armyworm
PRODUCT RATES
PER ACRE
6 to 8 fl oz
+
Monitor® 4 Spray
24 fl oz
+
Danitol® 2.4 EC
Spray
10-2/3 fl oz
SPECIAL INSTRUCTIONS
EARLY SEASON WHITEFLY
CONTROL PROGRAM FOR
REDUCTION OF GEMINIVIRUS:
Apply as a tank mix with ground
equipment for uniform coverage (10 to
120 gals/A). Make application when
scouting first indicates adult whiteflies
are on young plants. NOTE: This may
result in treatment immediately following
transplanting.
MID TO LATE SEASON WHITEFLY
CONTROL PROGRAM FOR
PREVENTION OF IRREGULAR FRUIT
RIPENING: Apply as a tank mix with
ground equipment for uniform coverage
(20 to 120 gals/A by ground). Make
application when scouting indicates
whiteflies are present.
Knack may also be mixed or alternated
with commonly used insecticides to
comply with local IPM programs.
Comply with all applicable directions,
restrictions and precautions on the
registered labels for Monitor 4 Spray
and Danitol 2.4 EC Spray.






Do not apply within 14 days of harvest.
Do not make more than 2 Knack applications per growing season.
Do not exceed 16 fl oz Knack per acre per season.
Do not apply earlier than 14 days after last Knack treatment.
Regardless of formulation do not exceed 0.134 lb pyriproxyfen per acre per season.
Do not plant any crop other than those with registered pyriproxyfen uses in treated areas
sooner than 30 days after the last application.
MANAGING INSECT RESISTANCE: Repeated use of the same class of insecticides with similar modes of action
can lead to the buildup of resistant insect strains. To optimize resistance management practices, Valent U.S.A.
Corporation is restricting Knack Insect Growth Regulator to two applications per growing season. Knack may be
used in alternation with other IGR materials possessing dissimilar modes of action and/or with other chemical
classes of insecticides. Follow local, state and federal Integrated Pest Management (IPM) and Insect Resistance
Management (IRM) recommendations. Read and follow all product labels before applying any insecticide.
Page 6 of 12
LEGUME VEGETABLES (Succulent or Dried)
GENERAL: Knack Insect Growth Regulator acts by suppressing embryogenesis within the insect egg and by
inhibiting metamorphosis and adult emergence of target insects. Knack has no activity on adult insects, but hatching
of eggs laid by treated adults will be suppressed. Since Knack is an Insect Growth Regulator (IGR) and activity
depends on the insect’s development, evidence of activity will be slower than typical contact insecticides.
Knack does exhibit translaminar movement which means that Knack applied to the upper surfaces of the leaves will
move to the lower surface of the leaf. This translaminar movement is very important to chemical control of whitefly
since one of the major obstacles is getting the product to the underside of the leaves where whitefly are present.
CROPS
Beans (Lupinus):
Grain Lupin
Sweet Lupin
White Lupin
White Sweet Lupin
Beans (Phaaseolus):
Field Bean
Kidney Bean
Lima Bean
Navy Bean
Pinto Bean
Runner Bean
Snap Bean
Tepary Bean
Wax Bean
Bean (Vigna):
Adzuki Bean
Asparagus Bean
Blackeyed Pea
Catjang
Chinese Longbean
Cowpea
Crowder Pea
Moth Bean
Mung Bean
Rice Bean
Southern Pea
Urd Bean
Yardlong Bean
Broad Bean (fava)
Chickpea (garbanzo)
Guar
Jackbean
Lablab Bean
Lentil
Pea (Pisum):
Dwarf Pea
Edible-podded Pea
English Pea
Field Pea
Garden Pea
Green Pea
Snowpea
Sugar Snap Pea
Pigeon Pea
Soybean
Sword Bean
PESTS
Silverleaf Whitefly
Sweetpotato Whitefly
PRODUCT
RATES
PER ACRE
8 to 10 fl oz
SPECIAL INSTRUCTIONS
EARLY SEASON WHITEFLY PROGRAM: Apply
with ground equipment in adequate water for
uniform coverage (10 to 50 gals/A. Thorough
coverage is critical for adequate control. It is
essential to use adequate water volume to ensure
thorough coverage.
Begin applications when whiteflies reach threshold
levels per University/Extension recommendations
(e.g. 3 to 5 adults per leaf and/or equivalent levels
of immatures).
Under severe pressure, use the higher
recommended rates.
Only whole fields should be treated.
Knack may be mixed and/or alternated with commonly used insecticides to comply with local
Integrated Pest Management (IPM) and Insect Resistance Management (IRM) programs.








Do not apply within 7 days of harvest.
Do not make more than 2 Knack applications per growing season.
Do not exceed 20 fl oz of Knack per acre per season.
Do not apply earlier than 14 days after last Knack treatment.
Regardless of formulation do not exceed 0.134 lb pyriproxyfen per acre per season.
Do not plant any crop other than those with registered pyriproxyfen uses in treated areas
sooner than 30 days after the last application.
Do not allow livestock to graze treated areas.
Do not use on legume vegetables varieties grown fro livestock feed.
MANAGING INSECT RESISTANCE: Repeated use of the same class of insecticides or insecticides with similar
modes of action can lead to the buildup of resistant whitefly strains. To optimize resistance management practices,
Valent U.S.A. Corporation is restricting Knack Insect Growth Regulator to two applications per growing season.
Knack may be used in alternation with other IGR materials possessing dissimilar modes of action and/or with other
chemical classes of insecticides. Valent also does not recommend using rates below 8 fl oz per acre for whitefly
control because reduced rates can lead to a greater potential for resistance development. Follow local, state and
federal IPM and IRM recommendations. Read and follow all product labels before applying any insecticide.
Page 7 of 12
PAWPAW
GENERAL: Knack Insect Growth Regulator acts by suppressing embryogenesis within the insect egg and by
inhibiting metamorphosis and adult emergence of target insects. Knack has no activity on adult insects, but hatching
of eggs laid by treated adults will be suppressed. Since Knack is an Insect Growth Regulator (IGR) and activity
depends on the insect’s development, evidence of activity will be slower than typical contact insecticides.
Knack does exhibit translaminar movement which means that Knack applied to the upper surfaces of the leaves will
move to the lower surface of the leaf. This translaminar movement is very important to chemical control of whitefly
since one of the major obstacles is getting the product to the underside of the leaves where whitefly are present.
PESTS
Scale
Whitefly
PRODUCT RATES
PER ACRE
13 to 16 fl oz
SPECIAL INSTRUCTIONS
Apply 100 to 400 gals/A with ground equipment. Coverage is
essential for good control. Apply in sufficient water volume for tree
size. Use of higher water volume will assure better coverage.
Scale: Apply at either dormant, delayed dormant or an in-season
cover spray. At dormant or delayed dormant use a spray oil at the
manufacturer’s recommended oil rate. Do not use oil in an in-season
spray.
In a cover spray make applications when scale crawlers first
emerge.
Under heavy scale pressure, use the higher rate of Knack.
In-season sprays of Knack may not protect fruit from blemishes by scale.
Knack may be mixed and/or alternated with commonly used insecticides to comply with local Integrated Pest
Management (IPM) and Insect Resistance Management (IRM) programs.





Do not apply within 14 days of harvest.
Do not make more than 3 Knack applications per growing season.
Do not exceed 48 fl oz of Knack per acre per season.
Do not apply earlier than 14 days after last Knack treatment.
Regardless of formulation do not exceed 0.327 lb pyriproxyfen per acre per season.
MANAGING INSECT RESISTANCE: Repeated use of the same class of insecticides with similar modes of action
can lead to the buildup of resistant insect strains. To optimize resistance management practices, Valent U.S.A.
Corporation is restricting Knack Insect Growth Regulator to three applications per growing season. Knack may be
used in alternation with other IGR materials possessing dissimilar modes of action and/or with other chemical
classes of insecticides. Follow local, state and federal IPM and IRM recommendations. Read and follow all product
labels before applying any insecticide.
Page 8 of 12
PINEAPPLE
GENERAL: Knack Insect Growth Regulator acts by suppressing embryogenesis within the insect egg and by
inhibiting metamorphosis and adult emergence of target insects. Knack has no activity on adult insects, but hatching
of eggs laid by treated adults will be suppressed. Since Knack is an Insect Growth Regulator (IGR) and activity
depends on the insect’s development, evidence of activity will be slower than typical contact insecticides.
PESTS
Black Scale
Brown Soft Scale
California Red Scale
Florida Red Scale
Snow Scale
PRODUCT RATES
PER ACRE
16 fl oz
SPECIAL INSTRUCTIONS
Apply with ground equipment in 20 to 50 gals/A. Apply in
sufficient water volume for plant size. Thorough coverage is
critical for control. It is essential to use adequate water
volume to ensure thorough coverage.
Apply anytime prior to fruit becoming infested when scale is
in the crawler stage. Application at the 2nd or 3rd generation of
scale may result in excessive dead scale remaining on the
fruit at harvest. Thorough coverage is essential for good
control.
Knack may be applied with superior spray oils at 1/2 to 1%.
Follow the manufacturer’s directions and recommendations
on timing and rates.
Knack may be mixed and/or alternated with commonly used insecticides to comply with local Integrated Pest
Management (IPM) and Insect Resistance Management (IRM) programs.





Do not apply within 1 day of harvest.
Do not make more than 2 Knack applications per calendar year.
Do not exceed 32 fl oz of Knack per acre per season.
Do not apply earlier than 21 days after last Knack treatment.
Regardless of formulation do not exceed 0.134 lb pyriproxyfen per acre per season.
MANAGING INSECT RESISTANCE: Repeated use of the same class of insecticides with similar modes of action
can lead to the buildup of resistant insect strains. To optimize resistance management practices, Valent U.S.A.
Corporation is restricting Knack Insect Growth Regulator to two applications per growing season. Knack may be
used in alternation with other IGR materials possessing dissimilar modes of action and/or with other chemical
classes of insecticides. Follow local, state and federal IPM and IRM recommendations. Read and follow all product
labels before applying any insecticide.
Page 9 of 12
POMEGRANATE
GENERAL: Knack Insect Growth Regulator acts by suppressing embryogenesis within the insect egg and by
inhibiting metamorphosis and adult emergence of target insects. Knack has no activity on adult insects, but hatching
of eggs laid by treated adults will be suppressed. Since Knack is an Insect Growth Regulator (IGR) and activity
depends on the insect’s development, evidence of activity will be slower than typical contact insecticides.
Knack does exhibit translaminar movement which means that Knack applied to the upper surfaces of the leaves will
move to the lower surface of the leaf. This translaminar movement is very important to chemical control of whitefly
since one of the major obstacles is getting the product to the underside of the leaves where whitefly are present.
PESTS
Banded Wing Whitefly
Greenhouse Whitefly
Silverleaf Whitefly
Sweetpotato Whitefly
PRODUCT
RATES
PER ACRE
13 to 16 fl oz
SPECIAL INSTRUCTIONS
Apply with air or ground equipment in adequate water for
uniform coverage:
By air:
3 to 10 gals/A
By ground: 10 to 50 gals/A
HIGHER WATER VOLUMES MAY PROVIDE IMPROVED
INSECT CONTROL.
Begin applications when whiteflies reach threshold levels
per University/Extension recommendations (e.g. 3 to 5
adults per leaf and/or equivalent levels of immatures).
Only whole fields should be treated.






Do not apply within 14 days of harvest.
Do not make more than 3 Knack applications per growing season.
Do not exceed 48 fl oz of Knack per acre per season.
Do not apply earlier than 14 days after last Knack treatment.
Regardless of formulation do not exceed 0.327 lb pyriproxyfen per acre per season.
Do not plant any crop other than those with registered pyriproxyfen uses in treated areas sooner than 30 days
after the last application.
MANAGING INSECT RESISTANCE: Repeated use of the same class of insecticides or insecticides with similar
modes of action can lead to the buildup of resistant whitefly strains. To optimize resistance management practices,
Valent U.S.A. Corporation is restricting Knack Insect Growth Regulator to three applications per growing season.
Knack may be used in alternation with other IGR materials possessing dissimilar modes of action and/or with other
chemical classes of insecticides. Valent also does not recommend using rates below 13 fl oz per acre for whitefly
control because reduced rates can lead to a greater potential for resistance development. Follow local, state and
federal Integrated Pest Management (IPM) and Insect Resistance Management (IRM) recommendations. Read and
follow all product labels before applying any insecticide.
Page 10 of 12
ROOT AND TUBER VEGETABLES
GENERAL: Knack Insect Growth Regulator acts by suppressing embryogenesis within the insect egg and by
inhibiting metamorphosis and adult emergence of target insects. Knack has no activity on adult insects, but hatching
of eggs laid by treated adults will be suppressed. Since Knack is an Insect Growth Regulator (IGR) and activity
depends on the insect’s development, evidence of activity will be slower than typical contact insecticides.
Knack does exhibit translaminar movement which means that Knack applied to the upper surfaces of the leaves will
move to the lower surface of the leaf. This translaminar movement is very important to chemical control of whitefly
since one of the major obstacles is getting the product to the underside of the leaves where whitefly are present.
PRODUCT
RATES
CROPS
PESTS
SPECIAL INSTRUCTIONS
PER ACRE
Arracacha
Banded Wing Whitefly
8 fl oz
Apply with ground equipment in
Arrowroot
Greenhouse Whitefly
adequate water for uniform coverage
Artichoke, Chinese
Silverleaf Whitefly
(20 to 50 gals/A).
Artichoke, Jerusalem
Sweetpotato Whitefly
Beet, Garden
HIGHER WATER VOLUMES MAY
Beet, Sugar
PROVIDE IMPROVED INSECT
Burdock, Edible
CONTROL.
Canna, Edible
Carrot
Begin applications when whiteflies
Cassava, (bitter and sweet)
reach threshold levels per
Celeriac
University/Extension
Chaoyote (root)
recommendations (e.g. 3 to 5 adults
Chervil, Turnip-rooted
per leaf and/or equivalent levels of
Chicory
immatures).
Chufa
Dasheen (taro)
Under severe pressure, use the higher
Ginger
recommended rates.
Ginseng
Horseradish
Only whole fields should be treated.
Leren
Parsley, Turnip-rooted
Parsnip
Potato
Radish
Radish, Oriental
 Do not apply within 3 days of harvest.
Rutabaga
 Do not make more than 2 Knack applications per growing season.
Salsify

Do not exceed 16 fl oz of Knack per acre per season.
Salsify, Black

Do not apply earlier than 14 days after last Knack treatment.
Salsify, Spanish
 Regardless of formulation do not exceed 0.109 lb pyriproxyfen per acre per
Skirret
season.
Sweet Potato
Tanier
 Do not plant any crop other than those with registered pyriproxyfen uses in
Turmeric
treated areas sooner than 30 days after the last application.
Turnip
 Do not allow livestock to graze treated areas.
Yam, Bean
Yam, True
MANAGING WHITEFLY RESISTANCE: Repeated use of the same class of insecticides or insecticides with similar
modes of action can lead to the buildup of resistant whitefly strains. To optimize resistance management practices,
Valent U.S.A. Corporation is restricting Knack Insect Growth Regulator to two applications per growing season.
Knack may be used in alternation with other IGR materials possessing dissimilar modes of action and/or with other
chemical classes of insecticides. Valent also does not recommend using rates below 8 fl oz per acre for whitefly
control because reduced rates can lead to a greater potential for resistance development. Follow local, state and
federal Integrated Pest Management (IPM) and Insect Resistance Management (IRM) recommendations. Read and
follow all product labels before applying any insecticide.
Page 11 of 12
PLEASE CONTACT VALENT U.S.A. CORPORATION AT 800-6-VALENT (682-5368) TO DETERMINE IF THIS
USE IS REGISTERED IN YOUR STATE.
Copyright © 2011 by Valent U.S.A. Corporation
Knack and Products That Work, From People Who Care are registered trademarks of Valent U.S.A. Corporation
Danitol is a registered trademark of Sumitomo Chemical Company, Ltd.
Monitor is a registered trademark of Bayer
Orthene is a registered trademark OMS Investments, Inc.
Danitol is a restricted use product.
Manufactured for
Valent U.S.A. Corporation
P. O. Box 8025
Walnut Creek, CA 94596-8025
Made in U.S.A.
Form 2011-KNK-0011
Products That Work, From People Who Care® | www.valent.com | 800-6-VALENT (62-5368)
Page 12 of 12
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