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Marijuana Horticulture: The Indoor/Outdoor Medical Grower's Bible

Marijuana Horticulture: The Indoor/Outdoor Medical Grower's Bible

Titel: Marijuana Horticulture: The Indoor/Outdoor Medical Grower's Bible Kostenlos Bücher Online Lesen
Autoren: Jorge Cervantes
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especially under leaves, where mites live. Apply every few days so hatching larvae will eat it immediately. Spray heavily so mites have little choice but to eat it. Avoid spraying the last few days before harvest. Some growers report a foul taste when applied just before harvest.
    Persistence: Contact neem stays on foliage for up to a month or until it is washed off. Stays in plant system up to a month when absorbed via roots.
    Forms: Emulsifiable concentrate.
    Toxicity: Toxicity to beneficial insects has been reported. Not toxic to humans.
    Safety: Irritates eyes, wear a mask and gloves.
    Neem products have numerous other applications. For more information check out the Neem Foundation, http://www.neemfoundation.org . and the Neem Association, hometown.aol.com/neemassoc , and www.einsteinoil.com , or the book, Neem: India’s Miraculous Healing Plant, by Ellen Norten, ISBN: 0-89281-837-9.
Nicotine and Tobacco Sprays
    Ingredients: Nicotine is a nonpersistent pesticide derived from tobacco, Nicotiana tabacum. It is a stomach poison, contact poison, and respiratory poison. This very poisonous compound affects the neuromuscular system, causing pests to go into convulsions and die. Nicotine sulfate is the most common form.
    Caution: Do not swallow any of this vile poison, and avoid skin contact. Do not use around nightshade family-eggplants, tomatoes, peppers and potatoes-because they may contract Tobacco Mosaic Virus (TMV) from exposure to tobacco-based substances.
    Controls: Sucking and chewing insects.
    Mixing: Use a spreader-sticker.
    Application: Seldom phytotoxic when used as directed. Combine with insecticidal soap to increase killing ability.
    Persistence: One week to ten days.
    Forms: Liquid.
    Toxicity: Although naturally derived, nicotine is very toxic to most insects (including beneficials), honeybees, fish, and humans. If concentrate is ingested or built up over years, humans may develop lung cancer and other cancers.
    Safety: Wear a mask and gloves; avoid skin and eye contact.
Oil, Horticultural
    Ingredients: Often underrated and overlooked as an insecticide and miticide, horticultural oil is very popular in greenhouses and is regaining popularity among indoor growers. Similar to medicinal mineral oil, horticultural oils are made from animal (fish) oils, plant seed oils, and petroleum oils refined by removing most of theportion that is toxic to plants. Lighter weight oil (viscosity 60-70) is less phytotoxic. Vegetable oil is also horticultural oil.
    Controls: Virtually invisible, horticultural oil kills slow moving and immobile sucking insects, spider mites and their eggs by smothering, as well as generally impairing their life cycle.
    Caution: Do not use lubricating oils such as 3-in-1 or motor oil!
    Mixing: Mix ¾ teaspoon (0.75 cl) of oil spray-no more than a one percent solution–per quart (0.9 L) of water. More than a few drops could burn tender, growing shoots.
    Application: Spray foliage entirely, including under the suface of the leaves. Apply oil sprays up until two weeks before harvest. Repeat applications as needed. Usually three applications, one every five to ten days, will put insects and mites in check. Lightweight-oil residue evaporates into the air in a short time.
    Persistence: Disappears in one to three days, under normal growing conditions.
    Forms: Liquid
    Toxicity: Safe, nonpoisonous, and nonpolluting insecticide. Can become phytotoxic if too heavy (viscosity), if applied too heavily, or when temperatures are below 70°F (21 °C), or very humid; this slows evaporation, increasing phytotoxicity.
    Safety: Wear a mask and gloves.
Oil, Vegetable
    Ingredients: Fatty acids and glycerides.
    Controls: Lightweight vegetable oil kills slow-moving and immobile sucking insects, spider mites, and their eggs by smothering as well as generally interrupting their life cycles.
    Caution: Vegetable oil does not kill as well as horticultural oil.
    Mixing: Mix two drops of oil spray–no more than a one percent solution-per quart of water.
    Application: Spray foliage entirely, including under surface of leaves. Stop spraying two weeks before harvest.
    Persistence: Several days.
    Forms: Liquid.
    Toxicity: Not toxic to mammals or fish.
    Safety: Wear a mask and gloves.
Pyrethrum
    Ingredients: Pyrethrum, the best-known botanical pesticide, is extracted from the flowers of the pyrethrum chrysanthemum, Chrysanth-emum coccineum and C. cinerariifoliu. Pyrethrins– pyrethrins, cinerins, and jasmolins–are the

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