Kaolin clay, the active ingredient in Surround WP, is a non-toxic particle film that acts as a barrier between pests and apple plants. When insects contact trees coated with kaolin clay, the tiny particles agitate and repel the insects. Trials have shown Surround WP provides control of leafrollers and leafhoppers as well as suppression of mites, codling moth, plum curculio, and other pests. In addition to pest control, kaolin clay can provide horticultural benefits like reduced heat stress and improved fruit color. Growers report positive results using Surround WP as part of an integrated pest management system.
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1. 800-346-9140
Insect IPM in Apples
Appropr at Technol Tr
i e
Reduced-Risk
Pest Control
ogy ansf f Rur Ar
er or al eas
Kaolin Clay
Factsheet
Biopesticides and Risk Reduction What is kaolin and how does it work?
This factsheet is part of a series highlighting Surround WP presents a unique form of pest
the latest breakthroughs in biorational pest control: a non-toxic particle film that places a
control. There is a growing commitment barrier between the pest and its host plant. The
among producers to use the least toxic meth- active ingredient is kaolin clay, an edible min-
ods for protecting crops. Increased awareness eral long used as an anti-caking agent in pro-
of the many benefits of advanced integrated cessed foods, and in such products as tooth-
pest management (IPM) are at the heart of this paste and Kaopectate. There appears to be no
change. Meanwhile, FQPA (Food Quality mammalian toxicity or any danger to the
environment posed by the use of kaolin in pest
Effects of SurroundWP™ in control.
trial applications on apples:
! Control: leafrollers, leafhoppers.
! Suppression: mites, codling moth,
plum curculio, apple sucker, stink
bugs, apple maggot, thrips.
! Horticultural Benefits: reduced
heat stress and fruit drop, reduced
sunburn, improved color in
certain cultivars.
The plum curculio, Contrachelus nenuphar.
Protection Act) and other regulations have (Magnified) Adult above at left; larva below
given short-term urgency to the quest for at left; pupa at right, ventral view.
reduced-risk alternatives to the most toxic
chemicals, including the organophosphates.
The spray was developed by Drs. Michael
Important additions have been made in recent Glenn and Gary Puterka of the USDA/ARS at
years to the arsenal of reduced-risk pest man- Kearneysville, WV, in cooperation with the
agement tools. This series of factsheets is in- Engelhard Corporation , which began market-
tended to put the latest information on these ing the product in 1999 on a limited basis.
new tools in a convenient, farmer-friendly Surround was available in 2000 in much of the
format. Special effort has been made to include U.S., and it was listed by The Organic Materi-
efficacy information, discussion of relative costs, als Review Institute for use in organic produc-
contact and supplier information, and interviews tion on March 7, 2000.
with farmers who have used these new tools in
commercial production. Surround is sprayed on as a liquid, which
evaporates, leaving a protective powdery film
This factsheet looks at the use of kaolin (the on the surfaces of leaves, stems, and fruit.
main ingredient in SurroundWP™) in apple Conventional spray equipment can be used,
IPM. While kaolin is registered for many crops, and full coverage is important. The film works
it seems especially promising for apple growers. to deter insects in several ways. Tiny particles
Reduced-Risk Pest Control Factsheet / Insect IPM in Apples / Kaolin Clay / Page 1
2. of the clay attach to the insects
when they contact the tree, Hor ticultural Benefits
Horticultural
agitating and repelling them. Although at first glance the film may
Even if particles don’t attach to appear to block light, Surround
their bodies, the insects find the actually increases net photosynthesis,
coated plant or fruit unsuitable and can provide secondary benefits to
for feeding and egg-laying. In the trees’ overall health, according to
addition, the highly reflective Dr. Glenn. Surround keeps the tree
white coating makes the tree less cool so that photosynthesis can
recognizable as a host. continue longer into the afternoon on
hot days, after untreated trees have
The standard Surround spray already shut down because of heat
program for plum curculio and stress. In a two-year study, ‘Empire’,
first-generation codling moth The plum curculio: when sprayed during the first six to
starts at first petal fall and contin- Adult female on plum, eight weeks after petal fall, had
ues for 6 to 8 weekly sprays or showing the circular increased yields and increased red
until the infestation is over. feeding punctures and color. Growers have reported similar
Discontinuing sprays at this the crescent-shaped results with ‘Stayman’ and ‘Gala’. An
point will leave little or no resi- egg-laying punctures MSU study reported increased return
(shown larger than bloom where Surround had been used
due at harvest because of rain
natural size.) the previous season. Growers in hot
and wind attrition. If a full-
season program is used to suppress later- areas benefit from a marked reduction in sun-
season threats such as apple maggot, growers burn damage, often 50% or greater.
will need to use a scrubber/washer to remove
any dust remaining on the fruit for fresh mar-
ket sales. Although this residue is not consid- Approach
A Systems Appr oach
ered harmful, it might be considered unsightly Surround will be most effective when used
by consumers. However, the dust residue is within a well-managed agro-ecological system
not a problem for processing fruit. combining the most appropriate cultural and
chemical methods for the specific orchard
situation, pest complex, and local climate. Such
Trial applications of the spray showed that
a system will integrate soil building, habitat for
where plum curculio damage was 20–30% in beneficial organisms, and well-tuned nutrient
unsprayed checks, the treatments receiving the and water management. Soil building and
particle film had only .5–1% damage. Dr. nutrient/water management are two sides of
Puterka is careful to say that his trials indicate the same coin and could be considered preven-
“suppression” of PC damage rather than com- tative pest management. A healthy soil high in
plete control. For the organic grower looking to organic matter will have better water and
achieve an economic level of control, the distinc- nutrient holding capacity. Plants receiving too
tion is probably not relevant. What the re- much or too little of either water or nutrients,
searcher terms “suppression” in these USDA particularly nitrogen, are more attractive and
more susceptible to damage by insects and
trials is very close to control, far closer than any
diseases. Good water management, through
other organically suitable option. For the non- water-stress monitoring, conserves valuable
organic grower, kaolin alone will not achieve (and expensive) soil nutrients, reduces contami-
quite as high a level of control as is ensured by nated runoff, and conserves water. Providing
the organophosphates. However, Surround is habitat for beneficial organisms is like hiring
comparable to the OPs in that it’s a broad- millions of helpers whose sole aim in life is to
spectrum tool effective against most of the eat pests. Nitrogen-fixing cover crops can do
major pests of apple. As growers gain experi- double duty as habitat for beneficial organisms
ence in timing applications of this new tool, if managed correctly.
efficacy data will very likely improve.
Reduced-Risk Pest Control Factsheet / Insect IPM in Apples / Kaolin Clay / Page 2
3. Northeastern U.S. Grower Report:
Northeaster
theastern Grower Report: Southeaster n U.S. Gr ower Report:
Southeastern Grower Report:
Eric Rice, Middletown, Maryland Guy Ames, Fayetteville, Arkansas
One of the first orchardists to use “I’ve used kaolin clay for two
the kaolin spray, Eric Rice is confi- seasons now. Last year I was slow
dent the product will help him fare in getting the first sprays on, and
better in his packout next year. late May through early June was
Rice, whose farm is certified or- an exceedingly wet period during
ganic, hopes to boost the percent- which I had competing interests.
Codling Moth
age of select grade fruit from 50% to In short, I can’t claim to have given
70% of his apple crop. He expresses optimism Surround a valid test in 1999.
about Surround’s effectiveness against insects
“However, in 2000 I’ve been more attentive to
like the plum curculio, codling moth, leaf
keeping Surround on the trees in the early part
rollers, mites and aphids. “It doesn’t bother
of the season. Compared to last year I appear
beneficials,” he says, adding that the ladybugs
to be getting good to excellent control of tar-
and other predators continued to thrive in the
nished plant bugs and stink bugs, two of the
rich ground cover of clover and grass.
pests that I was targeting with Surround.
Trials at the Rice or-
chard have shown over “Other observations: It did not wash off in
90% control of the “big rain as readily as I had feared; didn’t seems
ones”— codling moth, to clog up or corrode any sprayer parts; I
plum curculio, and like being able to see my spray coverage;
apple maggot. While too early to see if it has helped to control
Surround has also had a oriental fruit moth as I
positive effect on fungal hope it will.” Ames adds
diseases like sooty that Surround may prove
Apple Maggot blotch, fly speck, and key to making organic
fire blight, Rice cautions apple production eco-
that it is not a panacea. It has had no effect on nomically viable in the
apple scab, a disease that often poses a bigger Eastern U.S. by providing
problem to growers than insect pests (initial the long-sought organic
research with kaolin focused on disease sup- control for plum curculio.
pression, but the results were inconsistent.) Another Arkansas grower
Oriental Fruit Moth
Rice says that Surround is far more useful than reports that “it’s a real
any other organic options available on the challenge to keep the trees
market. The only disadvantage he cites is the covered.” This is his first season using Sur-
necessity of washing the clay off the fruit after round. One technical limitation he has encoun-
harvest. Referring to the uniformly white tered is with his sprayer: it has been impossible
appearance of the trees after spraying, Rice to achieve full coverage of the tops of the trees
says, “It looks like Christmas. People who using his present equipment. Full coverage is
drive by stop to inquire if something is wrong.” critical to achieiving good pest control.
Economics
It seems likely that kaolin clay, when used in a well-managed IPM program, will be an appropriate
and effective reduced-risk replacement for synthetic insect pesticides. To be viable in commercial
production however, it must be cost-effective as well. At this time, Surround seems to be roughly
comparable in relative cost to the commonly used OP insecticides, while providing comparable broad-
spectrum coverage. Of course, there are variables that make this a tentative statement: relative pest
pressure and rainfall, for example, influence how many sprays of Surround must be made in a season.
Over the next few years we will gather data on the cost of using kaolin and report our findings.
Reduced-Risk Pest Control Factsheet / Insect IPM in Apples / Kaolin Clay / Page 3
4. Compatibility
Surround is generally not affected by most
other insecticides, miticides, and fungicides.
However, the user should test tank-mixes
before use. When mixing with other products,
make up a small batch and observe slurry and
film characteristics. Curdling, precipitation,
lack of film formation, or changes in viscosity
are signs of incompatibility. Do not tank-mix
with sulfur or Bordeaux mixture fungicides.
Note: “Raw” kaolin clay is not the same...
as SurroundWP. We have heard of one grower
who bought a traincar load of “generic” kaolin
clay, and killed most of his apple trees! Sur-
round is, at this point in time, the only kaolin
Further Resources
product suitable and registered for horticultural
use. The kaolin in Surround is processed to a SurroundWP manufacturer:
very fine particulate size, and combined with a Engelhard Corporation
sticker-spreader. Other forms of kaolin clay are 101 Wood Avenue, P.O. Box 770
phytotoxic and should be used under no cir- Iselin, NJ 08830-0770
cumstances. 877-240-0421 (toll free)
732-321-1598 FAX
Summary
Summary http://www.surround.engelhard.com
Surround is an environmentally benign,
worker-friendly and cost-effective tool that can EPA biopesticides website:
provide many pest management and horticul- http://www.epa.gov/pesticides/
tural benefits. It is most effective when used in biopesticides
an agricultural ecosystem managed for healthy Latest information and news, with fact-
soils with well-balanced nutrient and water sheets on individual biopesticides.
budgets. Providing habitat for beneficial organ-
isms (in the form of cover crops and unmown Pesticide Environmental Steward-
wildflower strips) complements the pest control ship Program Website:
benefits of kaolin clay and builds soil quality as http://www.pesp.org/
well. A public/private coalition committed to
reducing the risks from pesticide use.
Risk-reduction strategies, information
on least-toxic pest control, grants, news
updates, links to IPM websites.
Organic & Low-Spray
Apple Production
http://www.attra.org/attra-pub/
apple.html
Detailed info on IPM in Apples, featuring
a chart of disease-resistant cultivars and
an extensive Resources section with
supplier contacts and sources of further
information. A free print copy of this 38-
page booklet is available by calling
ATTRA at 800-346-9140.
Reduced-Risk Pest Control Factsheet / Insect IPM in Apples / Kaolin Clay / Page 4