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SID E-EFFECTS OF TH REE ACARICID ES ON TH E
PRED ATORY MITE, PH Y TOSEIU LU S PER SIM ILIS
ATH IAS-H EN RIOT ( ACARI: PH YTOSEIID AE)
U N D ER LABORATORY CON D ITION S
Ah m ad N ad im i*, Karim Kam ali*,
Mas o u d Arbabi** an d Fate m e Abd o li***
* Department of Entomology, Tarbiat Modares University, Tehran, Iran. E-mail:
ahmad_nadimi@yahoo.com
** Department of Agricultural Research Zoology, Iranian Plant Protection Research
Institute.
*** Department of Biology, Guilan University, Rasht, Iran.
[ N ad im i, A., Kam ali, K., Arbabi, M. & Abd o li, F. 2008. Side-effects of three Acarides
on the predatory mite, Phy toseiulus persim ilis Athias-Henriot (Acari: Phytoseiidae) under
laboratory conditions. Munis Entomology & Zoology 3 (2): 556-567]
ABSTRACT: The predatory mite Phy toseiulus persim ilis Athias-Henriot is an economically
important species in integrated mite pest management and biological control of spider mites
in many countries throughout the world. For optimal biological mite management, it is
important to know if acaricides have adverse undesirable effects on the predatory mites. The
toxic effects of hexythiazox (Nisorun®, EC 10%), fenpyroximate (Ortus®, SC 5%) and
abamectin (Vertimec®, EC 1.8%) on P. persim ilis were evaluated. The acaricides were
applied on detached bean leaves using a Potter Tower spray which deposited 2 mg spray
solution per cm2. Percent predator mortality was evaluated from the protonymph up to the
adult stage including first five days of the oviposition period. The results showed that the
total effect values of all concentrations of hexythiazox were below the lower threshold thus it
could be considered a harmless acaricide to this predatory mite. In contrast, the total effect
of all concentrations of fenpyroximate, and field, as well as, one half the field concentration
of abamectin were found toxic to predatory mite and above upper threshold.
KEY WORDS: Phy toseiulus persim ilis, Side effect, Acaricide, Predatory mite
IN TROD U CTION
The two spotted spider mite, Tetrany cus urticae (Koch), is one of the
most important mite pest species with a wide range of host plants and
world distribution (Bolland et al., 1998). In Iran it is found on a number
of outdoor and indoor agriculture crops (Arbabi et al., 1997). Many
efforts have been undertaken to manage T. urticae problems in
agricultural crops such as the application of new acaricides with the lower
concentrations and release of predacious mites such as Phy toseiulus
persim lis in glasshouses on cucumbers (Arbabi, 2007) and in fields of
beans, cotton as well as soybeans (Daneshvar & Abaii, 1994). Among
glasshouse pests recorded in the world, spider mites are known for their
high fecundity, short life span and several generations per season. Under
these circumstances spider mites are quickly selected for pesticide
resistance pesticides (Helle & Sabelis, 1985). It has gained increasing
attention by research scientists in many parts of the world. Selective
pesticides that can be used to control pests without adversely affecting
important natural enemies are urgently needed. Testing programme
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557
represented by IOBC (International Organization for Biological Control),
is not only meant to provide valuable information on the side effects of
pesticides on beneficial organisms but it also gives the testing members
an opportunity to improve testing techniques, compare results and
exchange experience with colleagues in the Working Group (Hassan et al.,
1991).
Mass rearing and releasing natural enemies mainly phytoseiid mites
are one of the goals of biological control of these pests in indoor and
outdoor conditions (McMurtry & Croft, 1997). Biological control of these
pests is increasing because of the pressure on growers to find alternatives
to chemical pesticides (van Lenteren, 2000). In the presence of chemical
applications, biological control of spider mites may be achieved by the
selective use of pesticides that are less toxic to natural enemies than to
pest species (Zhang & Sanderson, 1990). Ruberson et al. (1998) suggested
that selective pesticide were the most useful tool of integration of
biological control agents into pest control programs.
A strain of P. persim ilis was introduced into Iran from the
Netherlands (Department of Entomology, Wageningen Agricultural
University) in 1988 (Daneshvar, 1989) and it was effective in controlling
spider mites under greenhouses and outdoor conditions (Daneshvar &
Abaii, 1994). However, Biological control of spider mites using this
predaceous mite is effective only against low population densities of the
pest (Pralavorio et al., 1985). When the population densities are high an
acaricide treatment is needed to reduce the pest population before release
of beneficial mites (Malezieux et al., 1992).
The effects of pesticides on T. urticae are being widely studied and its
resistance to new products is frequently monitored (Castagnoli et al.,
2005). Failures of chemical control of T. urticae caused by resistance have
been reported in several countries for compounds, such as Hexythiazox
(Herron & Rophail, 1993), Fenpyroximate (Sato et al., 2004) and
Abamectin (Beers et al., 1998). Although various aspect of pesticide
effects on P. persimilis have been studied by many workers in the past
(Samsøe-Petersen, 1983; Zhang & Sanderson, 1990; Oomen et al., 1991;
Blumel et al., 1993; Hassan et al., 1994; Shipp et al., 2000; Blumel and
Gross, 2001; Cloyd et al., 2006). Only Kavousi & Talebi (2003)
investigated side-effects of heptenophos, malathion and pirimiphosmethyl on P. persim ilis in Iran. Moreover, there is no information on the
susceptibility of this introduced strain to other pesticides, especially
acaricides.
In this study, we report the effects of abamectin, fenpyroximate and
hexythiazox on P. persim ilis used in biological control programs in
glasshouses. The three acaricides are currently used for control of spider
mites in Iran. The results will be used to develop IPM programs with P.
persim ilis in agricultural crops.
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MATERIALS AN D METH OD S
1. Origin an d re arin g o f m ite s
The T. urticae strain originated from the glasshouse of the
Department of Agricultural Zoology, Iran Plant Protection Res. Institute
(IPPRI) and was reared on beans (Phaseolus vulgaris L. var. Lordegan)
sown in earthen pots in several months. P. persim ilis strain originated
from IPPRI that was reared on bean plants for 13 years without exposure
to pesticides.
The two species were mass reared on bean leaves placed upside down
on a layer of water-saturated cotton in a Petri dish and surrounded by wet
cotton-wool to prevent the mites from escaping and, at the same time,
provide water. Mite cultures were maintained in a controlled climate
chamber at 25 ± 2 0Ċ, 65 ± 10% RH with 16:8 h (L:D) photoperiod.
2 . Te s t U n its En viro n m e n t
The test unit consisted of a detached bean leaf placed lower side on a
layer of water-saturated cotton in a Petri dish (80-mm diameter) with a
hole drilled in the center. The Petri dish was placed in another lager Petri
dish (90-mm diameter) to provide a continuous water supply to the
cotton layer. Thus predatory mites were provided with drinking water and
a barrier that impeded their escape. It is very important that all leaves are
of the same quality in tests that are to be compared. Young, dark green,
primary leaves were chosen that were roughly 5.5 cm wide at the widest
part near the base (Samsøe-Petersen, 1983). The bean leaves were excised
with their petioles intact and placed upside down onto wet cotton, the
petioles were immediately embedded in moist cotton to extend the high
quality of leaves and initiate the growth of roots (Bernard et al., 2004).
Test units were kept in a controlled climate chambers.
3 . Pre p aratio n o f th e p re d ato r
The test was done with the most susceptible life stage, i.e.
protonymphs (larvae are too fragile to be used). Protonymphs of uniform
age obtained according to the procedure described by Bakker et al.
(1992).
4 . Acaricid e s
The toxicity of abamectin (Vertimec®, EC 1.8%), fenpyroximate
(Ortus®, SC 5%) and hexythiazox (Nisorun®, EC 10%) were evaluated at
N, 1/2N and 1/4N where N represents the field rate recommended in
Iran. Tap water was used in the controls (Table 1).
5. Sp rayin g
The experiment was carried out using the detached leaf method
according to Oomen (1988). Single detached leaves were sprayed at day 0
of the experiment on the lower side with a potter spray tower (Burchard
Manufacturing, Uxbridge, United kingdom) was calibrated to achieve a
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559
wet deposit of 2 mg cm-2. The dry residue was used to test contact toxicity
to juvenile predators. After the spray residue had dried, predator
protonymphs of uniform age were placed on the leaf arena using a fine
brush and a surplus of spider mites was added as food. 60 predator
protonymphs (15 × 4 replicates) were used in each test unit. Finally, a
plastic mesh was provided in the center of cover of the Petri dishes.
6 . As s e s s m e n t
Mortality and escape of predators up to 5 days after the adult stage
and reproduction per female during the first 5 days of the adult stage
were assessed. All dead and live mites were counted, and dead mites were
removed daily. Mites were considered dead when they failed to move
after repeated gentle prodding with a brush. Predator eggs were counted
and removed daily from 3 to 7 d after spraying. All assessments were
made with a stereomicroscope.
7. An alys is
To avoid overestimating mortality, cumulative mortality was
calculated by summing dead mites and dividing this number by the total
number of live and dead mites at each mortality assessment, excluding
unaccounted escapees (Blumel et al., 1993). The escape rate was
calculated as a portion of number of mites present at the start of
experiment. Mortality rates were corrected for the control mortality with
the following formula (Abbott, 1925):
M a = ( M t – M c ) / ( 10 0 – M c ) × 10 0 %
Ma: Mortality corrected according to Abbott
Mt: Mortality in treatment
Mc: Mortality in control
Possible changes in the number of females present on the test units
during the reproduction period were taken into account by the following
formula:
R ry = ( n E d 3 / n F d 3 ) + [ n E d 4 / ( ( n F d 3 + n F d 4 ) / 2 ) ] + [ n E d 5 / ( ( n F d 4 +
n F d 5 ) / 2 ) ] + [ n E d 6 / ( ( n F d 5 + n F d 6 ) / 2 ) ] + [ n E d 7 / ( ( n F d 6 + n F d 7) / 2 ) ]
d3 to d7: examples for evaluation days
Rry: Reproduction in replicate number y
nE dx: number of eggs (in replicate number y) on day x
nF dx: number of females (in replicate number y) on day x
Mean values of the escape rate, of the mortality rate and of the
reproduction per female of the different treatments were analyzed
statistically. Data were checked for normal distribution with AndersonDarling test (Minitab 13) and analyzed by univariate variance analysis
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(ANOVA, Duncan-test; SPSS 13.0 for windows). Data were transformed
before analysis (square root).
Effect on reproduction was determined by:
Er= R t/ R c
Where:
Er= Effect on reproduction
Rt= Reproduction in treatment
Rc= Reproduction in control
Subsequently effect on survival and effect on reproduction were
combined using the following formula (Overmeer & van Zon, 1982):
E= 10 0 % - ( 10 0 % - M a ) × E r
Where:
Ma= Mortality corrected according to Abbott
E= Total effect
Based on total effects, rating of toxicity of acaricides was evaluated
through the Working Group's joint pesticide testing programme in
guideline IOBC (Bakker et al., 1992):
Class 1: E<30%
Class 2: 30<E<80
Class 3: 80<E<99
Class 4: E>99%
(harmless)
(slightly harmful)
(moderately harmful)
(harmful)
RESU LTS
There was a significant difference in 7 d cumulative mortality effects of
all three acaricides at all three concentrations on P. persim ilis (Table 2).
Mortality was highest after exposure to fenpyroximate at all
concentrations and abamectin at field rate (100% mortality). Application
at half and quarter of the field rate of abamectin resulted in 62.27 to
71.23% mortality (Table 2). In contrast, P. persim ilis exposed to dry
residues of all three concentrations of Hexythiazox suffered only 5.43 to
18.44% mortality.
Acaricides differed significantly in their effects on female fecundity
(Table 2). The lowest reproductive performance was caused by
fenpyroximate at all three concentrations and abamectin at field rate.
Fenpyroximate caused a complete cessation of egg lay. Application at half
and quarter the field rate of hexythiazox increased the reproduction
performance on P. persim ilis (Table 2).
All three acaricides had no repellent attributes (Table 4). The results of
total effects (E) of the product applications are listed in Table 3. When the
toxic effects of the acaricides are classified according to IOBC
classification, all three concentrations of hexythiazox were harmless
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561
(class1, E<30). At one quarter the field rate, abamectin was moderately
harmful (class 3, 80<E<99) and half the field rate, abamectin and all
three concentrations of fenpyroximate were harmful (class 4, E>99).
D ISCU SSION
Among the 3 acaricides evaluated, only hexythiazox was harmless to P.
persim ilis. Fenpyroximate at the 3 concentrations evaluated and
abamectin at the field and one half the field rates were harmful to P.
persim ilis. The use of these two compounds in the field would probably
result in severe reduction of P. persim ilis. Thus they are incompatible in
IPM programs using this species. Our results are consistent with results
reported for fenpyroximate and abamectin (Blumel & Hausdorf, 2002).
Even at one quarter the field rate, Abamectin was moderately harmful to
P. persim ilis. Based on our observations these effects could be caused by
a direct effect of these two acaricides on survival and reproduction of the
predator mite.
Although various phytoseiid species have responded differently to
abamectin, a reduction in reproduction is common to all (Zhang &
Sanderson, 1990). Kim et al. (2005) showed that application of abamectin
was highly toxic to Am bly seius cucum eris (Oudemans) adult females
causing 92% mortality at 168 h after treatment and the number of eggs
deposited by adult female predators decreased to 5.4 compared to 131.6 in
the control.
Zhang and Sanderson (1990) believe that one reason of fewer egg
produced is reducing mobility and thus consuming fewer prey. Also, they
suggested that a lack of prey and quick elimination of spider mite by these
acaricides may cause such effects.
Application of Hexythiazox at different concentrations was harmless
to P. persim ils. Our results are consistent with the results by Oomen et al.
(1991), Hassan et al. (1987, 1991), van der Staay (1991) and Blumel &
Gross (2001). It would be an appropriate substitute to fenpyroximate and
abamectin in integrated pest management (IPM) programs.
Our observations showed that exposure to hexythiazox at one half and
one quarter the field rates increased fecundity of P. persim ilis. These
results are not the first documented case of pesticide increasing fecundity
in a phytoseiid mite. Kavousi & Talebi (2003) showed that heptenophos
at the recommended concentration increased the fecundity of P.
persim ilis. Also, James (1997) reported increased fecundity in
Am bly seius victoriensis by imidacloprid. The fecundity-enhancing
property of hexythiazox can make P. persim ilis an excellent choice as a
biological control agent in greenhouses and other horticulture crops.
Van de Vrie et al. (1972) believed that certain pesticides can stimulate
mite reproductive physiology; therefore, positive effect of hexythiazox at
these two concentrations on reproduction may be physiological. Our
results indicated that further studies on the effect of hexythiazox on
fecundity and reproduction of P. persim ilis and other phytoseiid species
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are clearly warranted. For example, investigation of different
concentrations of pesticides (especially lower rates) and comparative
effects on the other stages should be assessed.
The relative toxicity of pesticides to pests, predators and immature
stages (e.g. neonates) of the predators should provide an adequate
indication for selectivity of pesticides, which is essential for development
of pest management programs (Jeppson et al., 1975). Nevertheless, few
populations consist of one life stage in nature and a true estimate of effect
will not be gained by testing neonates only. If there is differential
susceptibility among life stage, population toxicology is warranted (Stark
& Banken, 1999). Furthermore, less susceptible stages can compensate
for the loss of young and an accurate estimate of the toxic effect is
therefore not obtained when toxicological studies are conducted with
neonates only (Stark & Wennergren, 1995; Kareiva et al., 1996; Walthall
& Stark, 1997; Stark et al., 1997). Ultimately, Stark & Banken (1999)
suggested that to conduct more realistic toxicological studies, it is
probably best to test a mixed age population.
Blumel et al. (2000) suggested that studies should be focused on the
protonymph the most susceptible developmental stage, we suggest that
side-effects of hexythiazox and other pesticides should be studied on
other life stages.
There were no differences in the number of P. persim ilis that escaped
in treatments, but percentage was higher in control (25% escapes). The
predatory mite, P. persim ilis is a highly motile active predator, so higher
escape levels are not surprising. Also, escaping from the treated test
surface is a common problem in this method (Kavousi & Talebi, 2003).
However, escape is a change in the behavior of the test mites, which as a
test parameter should be addressed at higher test tiers (i.e. semi field and
field trials) (Blumel et al., 2000).
It seems likely that several factors are affected on estimating the
escape rate under laboratory conditions:
a) lethal effect of acaricides may conceal their repellent effects
b) handling of test units including adding food, removing eggs and
dead mites and even light produced by stereomicroscope may
cause overestimation in escape rates as repellent effects.
Thanks to the reasons cited above, as well as the high escape rates
observed in the control block, it was not possible to estimate this
parameter.
CON CLU SION
Of the three acaricides evaluated in the laboratory, hexythiazox may
be incorporated in IPM programs based on P. persim ilis without any
additional studies. The other two acaricides fenpyroximate and
abamectin were too toxic. A more detailed understanding of their toxicity
under field conditions is required before any recommendations for their
suitability or unsuitability in IPM programs in Iran can be made.
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Table 1. Acaricides
Active ingredient
Brand name
hexythiazox
abamectin
fenpyroximate
Nisorun, EC 10%
Vertimec, EC 1.8%
Ortus, SC 5%
field rate recommended (N)
(ml/l)
2.5
0.2
0.5
Table 2. Effect of three acaricides at different concentrations on the
survival and fecundity of P. persim ilis
atments
Concentrations
ontrol
ythiazox
ythiazox
ythiazox
amectin
amectin
amectin
yroximate
yroximate
yroximate
N
1/2N
1/4N
N
1/2N
1/4N
N
1/2N
1/4N
% Mortality rates*
(Mean±SE)
18.44±2.86a
4.49±3.19a
5.43±2.46a
100±00c
71.23±4.21b
62.27±3.33b
100±00c
100±00c
100±00c
Total eggs/female*
(Mean±SE)
15.61±0.33b
15.53±0.27b
19.12±0.28a
20.00±0.78a
no surviving female
0.13±0.47d
3.01±0.03c
no surviving female
no surviving female
no surviving female
*Means in columns followed by different letters are significantly
different; Duncan-test; P < 0.05
_____________Mun. Ent. Zool. Vol. 3, No. 2, June 2008__________
567
Table 3. Total effect and toxicity of three acaricides at different
concentrations on P. persim ilis (IOBC evaluation categories).
Treatments
Concentrations
Total effects
Toxicity class
Control
hexythiazox
N
23.7
1
hexythiazox
hexythiazox
abamectin
abamectin
abamectin
fenpyroximate
fenpyroximate
fenpyroximate
1/2N
1/4N
N
1/2N
1/4N
N
1/2N
1/4N
-15.29
-9.11
100
99.73
92.24
100
100
100
1
1
4
4
3
4
4
4
Table 4. Repellency of P. persim ilis after exposure to fresh residues of
acaricides at different concentrations
Treatments
Concentrations
Control
hexythiazox
hexythiazox
hexythiazox
abamectin
abamectin
abamectin
fenpyroximate
fenpyroximate
fenpyroximate
-
*Means
N
1/2N
1/4N
N
1/2N
1/4N
N
1/2N
1/4N
% Escape rates*
(Mean±SE)
25.00±94a
21.66±0.83a
10.83±1.56a
20.00±3.33a
15.00±0.83a
23.33±2.88a
21.66±0.83a
15.00±0.83a
16.66±2.88a
16.66±2.15a
in columns followed by the same letter are not significantly
different; Duncan-test; P > 0.05