Spider mites are difficult to control due to their rapid reproduction, strong defense capabilities, overlapping generations, and ability to hide in hard-to-reach places on plants. Silicone adjuvants can help control citrus spider mites by penetrating the mites' wax layers to cause dehydration and death. They form a film that wraps mites and inhibits respiration. Silicone adjuvants like RH-208, RH-288 and RH-SE249A are effective when diluted 3000-4000 times and applied to prevent citrus spider mite infestations. Case studies show these silicones successfully controlled citrus spider mites on sugar oranges when applied at high dilutions before infestations occurred.
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Silicone adjuvant on control of citrus spider mite.pdf
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About spider mite
Why citrus spider mite is difficult to control
Silicone adjuvant on control of citrus spider mite
Application cases of silicone adjuvant on control of
citrus spider mite
Contents
目
录
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Spider mite, scientific name is Tetranychus mite, has the following
characteristics:
1. Short growth period (10-15 days from eggs to adults, 25 ℃);
2. The amount of mite eggs laid is large (each adult lays 3-5 eggs
every day, with an average of 40 eggs in its lifetime);
3.It can carry out bisexual reproduction and parthenogenesis. It can
reproduce quickly. Parthenogenesis can inherit the drug resistance of
parents.
Reproductive law of spider mites
Adult mites
Mite eggs
Mite eggs
Larval mites
protonymph
protonymph
deutonymph
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Citrus spider mite (Panonychus citri） Cotton spider mite (Tetranychus cinnabarinus) White spider（the two-spotted spider mite）
Main species of spider mites
Harms citrus crops Harms cotton and flower crops Harms strawberries, apples,pears
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Rapid propagation,high resistance to drugs
Red spiders breed fast, drug resistance will form quickly, broad-
spectrum and high-level pesticides will be banned, and the research
and development of new acaricides will be slow
Strong defense capability against external
environment
Spider mite can spit cocoons themselves, which can
be a good defense against pesticides and the
external environment.
The generations overlap seriously
There are four forms of eggs, juvenile mites, nymphs and
adult mites on a leaf at the same time, so it is difficult for
one drug to control these four forms at the same time.
Concealed distribution, difficult to
contact with liquid medicine
Spider mite like to hide on the back of leaves, which should
not be found. Moreover, red spiders are small and easy to
hide. It is difficult for the pesticide solution to reach and the
drug drops are easy to rebound.
The reason why citrus spider mite is difficult to control
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Principle
1. Super low surface tension, super spreading and penetration, quickly dissolve
the wax layer on the surface of pests and mites, and accelerate the
dehydration and death of insects
2. It can form a film to wrap harmful mites, close stomata and inhibit
respiration
Characteristics
1. Fast mite killing speed, when the water dries,the mites die
2. It has a good effect on adult mites, juvenile mites and nymphs, but no effect
on eggs and a short duration of efficacy.
Principle and characteristics of killing spider mites with silicone adjuvant
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Model Characteristic CAS No.
water soluble
RH-208 Classic, high cost performance 67674-67-3
RH-288 Super wetting 67674-67-3
RH-225 * 27306-78-1
RH-213 Low foaming 125997-17-3
RH-289 Aerial Spray,good compatibility with
MSO
RH-SE249A Acid/alkali/hydrolysis resistance *
oil soluble RH-210 Oil soluble 17955-88-3
RH-216 High cost performance oil soluble
model
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silicone adjuvant from Runhe
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Tank-mix adjuvant：
(1)Single use: Diluted 3000-4000 times
Solutions of silicone adjuvant for controlling citrus spider mites
Examples only, not limited to the following applications
(2)Use as a combination kit: Diluted 3000-4000 times (in order to prolong the duration of the control of red
spiders, they are usually combined with agents with egg killing activity, such as ethmetazole, spiroform
and ethmetanil).
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Formulation use：
（1）RH-208/RH-288 in formulation use：It can be added in the formula of emulsifiable concentrates and dispersible
oil suspensions, generally 3-10%, or 20%. However, the emulsifiers in the formula need to be screened, otherwise the
emulsification and dispersion of the agent in water are not good, the efficacy is difficult to guarantee, and the formula is
difficult. The final dilution concentration of organosilicon agricultural aid is about 4000 times.
（2）RH-SE249A in formulation use： It can be added in suspension agent, water agent and microemulsion, with
the addition ratio of 3-10%. To ensure the validity period, it is generally added in agents with egg killing activity, such
as imidazole, or in biological pesticides, such as matrine.
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RH-SE249A against citrus spider mites
2022.04 RH-SE249A diluted 4000 times to prevent sugar orange spider mites
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RH-SE249A against citrus spider mites
2022.04 RH-SE249A diluted 4000 times to prevent sugar orange spider mites
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RH-208/RH-288 Control of citrus spider mites
Test 2: 2021.12 RH-208/RH-288 diluted 4000 times to prevent sugar orange spider mites
before use after use before use after use
18. Thanks
For questions or needs, please contact
Email:donna@chinarunhe.com
Phone:+86-15988819025(WhatsApp)
