Spider mites

Discussion in 'Sick Plants and Problems' started by Mybudz777, Oct 23, 2022.

  1. So today I noticed little webs on my flowering weed plant, what can I use that's naturally will get rid of them
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  2. your hand will remove the webs - 100% organic!
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  3. Found mine on day 40 of flower. Major pain in the ass. Worth your while to do a search and learn as much as you can. Flower is harder to treat than veg. Most all recommend Neem oil. Some not in flower though. A solution of Dawn dishwashing soap(NOT the anti-bacterial) and water can wash them off. Ladybugs. I ended up using pyrethrin about day 50, hoping that it would be gone by harvest. Supposed to decompose in 2-3 days. After that it was Dawn and water about every 3 days. And 1500 lady bugs from Amazon. And I also washed my weed for the first time before drying. Salvaged my harvest, not as large as past ones but still pretty decent, maybe 3-4 oz /plant. Still drying, haven't tasted yet.
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  4. grain alcohol and water and spray a mist over the entire plant even the bottom of the leaves at lights out and good luck i had them on my first grow now i always use preventative measures
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  5. #7 Headhunterpipes, Oct 24, 2022
    Last edited: Oct 24, 2022
    I use Pyrethrin it works ... up to about a week before harvest .
    Does not leave a residue. 100% organic
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  6. I read that several places which helped me decide to use it. Still chickened out and washed them though. Washing them felt strange and took time but so far hasn't seemed to affect the dry other than adding a day.
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  7. Where would I get that from?
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  8. If you chose to go that route. I'd suggest getting a high quality pyrethrum. This is the one I use. Evergreen Pyrethrum Concentrate. It's 5% concentrate versus most of the others on the market that are less than 1%. Most others contain a man-made pesticide synergist called Piperonyl butoxide (PBO). Although considered organic it is a man made product, it is NOT listed OMRI. Many of the others also contain petroleum distillates.
    I do understand it has a huge price difference. But, it's concentrated and will last a very long time for a home grower. And it is listed with the OMRI approval unlike most of the others available in the market place. I hope this helps at least better understand the product you seek to use and or research further.
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  9. Hmmm…. I’ve never resorted to Pyrethrum. But the aphids are pissing me off. Insecticidal soap is barely slowing them down. If I did, should I cover up my living soil beds? I’d worry about it getting into the soil and killing the micro herd. :unsure:
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  10. I did cover mine. I'd also keep your pets away from the spray area. They get an odd allergic reaction in their skin. It makes their fur stand on end wherever they come in contact with it. My dog only touched an area I previously sprayed and did he ever look weird. I gave him benadryl and he was fine. I used it as a knock down for lowering the population so I could get them to manageable numbers. It kills on contact. The pint I purchased will last me a lifetime.
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  11. I have tried allot of organic sprays trying to keep the bugs away plus using UVC Light
    There is only two ways to deal with insect, chase them away or cleaning all the plant by hand if its nut in budding or spray a scent the bugs dont like or kill the little bastards
    Really it's all out war.
    Breaking out the pyrethrin is like dropping the H bomb
    After spraying 3 times in my home me my plants and my dog enjoy a insect free home.

    pyrethrin is dangerous to everything living when its wet, once dry it leaves zero residue and no longer effective.
    You can add a IGR in which disrupts the insects larva laying cycles.

    From Wikipedia, the free encyclopedia

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    Chemical structure of some pyrethrins: pyrethrin I (R = CH3), pyrethrin II (R = CO2CH3)
    The pyrethrins are a class of organic compounds normally derived from Chrysanthemum cinerariifolium that have potent insecticidal activity by targeting the nervous systems of insects. Pyrethrin naturally occurs in chrysanthemum flowers and is often considered an organic insecticide when it is not combined with piperonyl butoxide or other synthetic adjuvants.[1] Their insecticidal and insect-repellent properties have been known and used for thousands of years.

    Pyrethrins are gradually replacing organophosphates and organochlorides as the pesticides of choice as the latter compounds have been shown to have significant and persistent toxic effects to humans.

    Physical and chemical properties of some pyrethrins.
    Group Pyrethrin I Pyrethrin II
    Chemical compound Pyrethrin I[2][3] Cinerin I[4][3] Jasmolin I[5] Pyrethrin II[6][3] Cinerin II[7][3] Jasmolin II[8]
    Chemical structure [​IMG] [​IMG] [​IMG] [​IMG] [​IMG] [​IMG]
    Chemical formula C21H28O3 C20H28O3 C21H30O3 C22H28O5 C21H28O5 C22H30O5
    Molecular mass (g/mol) 328.4 316.4 330.5 372.5 360.4 374.5
    Boiling point (°C) 170 137 ? 200 183 ?
    Vapor pressure (mmHg) 2.03 x 10−5 1.13 x 10−6 ? 3.98 x 10−7 4.59 x 10−7 ?
    Solubility in water (mg/L) 0.2 0.085 ? 9.0 0.03 ?
    The pyrethrins occur in the seed cases of the perennial plant pyrethrum (Chrysanthemum cinerariaefolium), which has long been grown commercially to supply the insecticide. Pyrethrins have been used as an insecticide for thousands of years. It is believed that the Chinese crushed chrysanthemum plants and used the powder as an insecticide as early as 1000 BC. It was widely known that the Chou Dynasty in China widely used pyrethrin for its insecticide properties.[9] For centuries, crushed Chrysanthemum flowers have been used in Iran to produce Persian Powder, an insecticide for household use. Pyrethrins were identified as the potent chemical in the Chrysanthemum plants responsible for the insecticidal properties in the crushed flowers around 1800 in Asia. In the Napoleonic Wars, French soldiers used the flowers to keep away fleas and body lice.[9][dubiousdiscuss]

    Cyclopropanation reaction producing chrysanthemyl diphosphate, an intermediate in the biosynthesis of chrysanthemic acid
    Well after their use as insecticides began, their chemical structures were determined by Hermann Staudinger and Lavoslav Ružička in 1924.[10] Pyrethrin I (CnH28O3) and pyrethrin II (CnH28O5) are structurally related esters with a cyclopropane core. Pyrethrin I is a derivative of (+)-trans-chrysanthemic acid.[11][12] Pyrethrin II is closely related, but one methyl group is oxidized to a carboxymethyl group, the resulting core being called pyrethric acid. Knowledge of their structures opened the way for the production of synthetic analogues, which are called pyrethroids. Pyrethrins are classified as terpenoids. The key step in the biosynthesis of the naturally occurring pyrethrins involves two molecules of dimethylallyl pyrophosphate, which join to form a cyclopropane ring by the action of the enzyme chrysanthemyl diphosphate synthase.[13]

    Tanacetum cinerariifolium also called the Dalmatian chrysanthemum
    Commercial pyrethrin production mainly takes place in mountainous equatorial zones. The commercial cultivation of the Dalmatian chrysanthemum (C. cinerariifolium) takes place at an altitude of 1600 to 3000 meters[14] above sea level.[15] This is done because pyrethrin concentration has been shown to increase as elevation increases to this level. Growing these plants does not require much water because semiarid conditions and a cool winter deliver optimal pyrethrin production. The Persian chrysanthemum C. coccineum also produces pyrethrins but at a much lower level. Both may be planted in low-altitude zones in dry soil, but the pyrethrin level is lower.[14]

    Most of the world's supply of pyrethrin and C. cinerariaefolium comes from Kenya, which produces the most potent flowers. Other countries include Croatia (in Dalmatia) and Japan. The flower was first introduced into Kenya and the highlands of Eastern Africa during the late 1920s. Since the 2000s, Kenya has produced about 70% of the world's supply of pyrethrum.[16] A substantial amount of the flowers is cultivated by small-scale farmers who depend on it as a source of income. It is a major source of export income for Kenya and source of over 3,500 additional jobs. About 23,000 tons were harvested in 1975. The active ingredients are extracted with organic solvents to give a concentrate containing the six types of pyrethrins: pyrethrin I, pyrethrin II, cinerin I, cinerin II, jasmolin I, and jasmolin II.[17]

    Processing the flowers to cultivate the pyrethrin is often a lengthy process, and one that varies from area to area. For instance, in Japan, the flowers are hung upside down to dry which increases pyrethrin concentration slightly.[14] To process pyrethrin, the flowers must be crushed. The degree to which the flower is crushed has an effect on both the longevity of the pyrethrin usage and the quality. The finer powder produced is better suited for use as an insecticide than the more coarsely crushed flowers. However, the more coarsely crushed flowers have a longer shelf life and deteriorate less.[14]

    Use as an insecticide[edit]
    Pyrethrin is most commonly used as an insecticide and has been used for this purpose since the 1900s.[17] In the 1800s, it was known as "Persian powder", "Persian pellitory", and "zacherlin". Pyrethrins delay the closure of voltage-gated sodium channels in the nerve cells of insects, resulting in repeated and extended nerve firings. This hyperexcitation causes the death of the insect due to loss of motor coordination and paralysis.[18] Resistance to pyrethrin has been bypassed by pairing the insecticide with synthetic synergists such as piperonyl butoxide. Together, these two compounds prevent detoxification in the insect, ensuring insect death.[19] Synergists make pyrethrin more effective, allowing lower doses to be effective. Pyrethrins are effective insecticides because they selectively target insects rather than mammals due to higher insect nerve sensitivity, smaller insect body size, lower mammalian skin absorption, and more efficient mammalian hepatic metabolism.[20]

    Although pyrethrin is a potent insecticide, it also functions as an insect repellent at lower concentrations. Observations in food establishments demonstrate that flies are not immediately killed, but are found more often on windowsills or near doorways. This suggests, due to the low dosage applied, that insects are driven to leave the area before dying.[21] Because of their insecticide and insect repellent effect, pyrethrins have been very successful in reducing insect pest populations that affect humans, crops, livestock, and pets, such as ants, spiders, and lice, as well as potentially disease-carrying mosquitoes, fleas, and ticks.

    Pyrethrin - Wikipedia
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