19 Homemade Insecticides
Are you curious about the little knowledge of the flower clinic? Here are 19 homemade insecticides, the details are as follows:
Generally speaking, a small number of pests on flowering plants can be manually killed, removing the infected parts. If there are many, you need to be more careful, manually killing them or using homemade insecticides (low toxicity or non-toxic). Below are some low-toxicity or non-toxic homemade insecticides that are both economical and easy to use.
1. Laundry Detergent Solution:
Take 2 grams of laundry detergent, mix with 500 grams of water to make a solution, add one drop of vegetable oil, and spray it on the plant. It can kill aphids, scale insects, red spiders, green caterpillars, butterfly caterpillars, whitefly, etc. For plants with tuberous roots (such as peonies, dahlias) or bulbs (such as lilies, narcissus) and those with succulent roots, which are easily damaged by nematodes, you can also pour a 1000-fold diluted laundry detergent solution around the plant roots.
2. Soap Solution:
Take soap and hot water in a 1:50 ratio, dissolve, and spray. Since soap can block the respiratory organs of pests, it is effective against aphids and scale insects.
3. Tobacco Solution:
Tobacco contains nicotine, which has a strong contact-killing effect on aphids, red spiders, and ants, and also has fumigating and stomach-toxic effects. Take 20 grams of tobacco powder or tobacco leaves, soak in 500 grams of water for 24 hours, filter, and then add 500 grams of 2% soap solution to the filtrate, spray it on the leaves with pest problems; you can also spray the filtrate directly on the pot soil and the bottom of the pot without adding soap solution to kill soil pests.
4. Garlic Solution:
To treat powdery mildew and black spot disease on roses, take 30 grams of garlic, mash it, add 500 grams of water, stir well, filter, and spray the filtrate on the leaves once a day for 3-4 consecutive days. You can also apply the garlic solution directly with a brush or toothbrush. Sprinkling mashed garlic in the pot soil can also kill earthworms, ants, and nematodes.
5. Scallion Solution:
Take 50 grams of scallions, mash them, add 50 grams of water, soak for 12 hours, filter, and spray the filtrate multiple times a day for 3-4 consecutive days to treat aphids and other soft-bodied pests and powdery mildew.
6. Ginger Solution:
Mash ginger, add 20 times the amount of water, soak for 12 hours, filter, and spray the filtrate to prevent leaf spot disease, sooty mold, rot disease, and black spot disease, as well as aphids, red spiders, and leaf miners.
7. Sichuan Pepper Solution:
Add 50 grams of Sichuan pepper and about 500 grams of water to a pot, boil to reduce to 250 grams of liquid, and dilute with 6-7 times water for spraying to control whitefly, aphids, and scale insects.
8. Tangerine Peel Solution:
Take 50 grams of tangerine peel, soak in 500 grams of water for 24 hours, filter, and spray the filtrate on the leaves to control aphids, red spiders, and leaf miners, or pour it into the soil to control nematodes. Additionally, take 1 part of tangerine seeds and 5 parts of water, soak for 4-5 days, then soak the flower seeds in this solution for 10 minutes to prevent various pests.
9. Bitter Melon Leaf Solution:
Crush 100-200 grams of bitter melon leaves, add an equal amount of lime, stir well, and pour around the roots of seedlings to prevent ground beetles.
10. Tomato Leaf Solution:
Crush 50 grams of fresh tomato leaves, soak in 150 grams of water for 6 hours, filter, and spray the filtrate to control aphids, red spiders, and can also repel flies.
11. Chili Solution:
Boil 50 grams of chili in 10 times the amount of water for 20 minutes, filter, and spray the filtrate to control aphids, red spiders, and stink bugs, and pour it into the soil to control soil caterpillars.
12. Castor Leaf Powder:
After drying the leaves and stems of castor beans, grind them into powder and apply to the soil to control grubs.
13. Oleander Solution:
Chop 50 grams of oleander leaves, add 100 grams of water, boil for 20-30 minutes, filter, and spray the clear liquid to control aphids and whiteflies, and pour it into the soil to control nematodes. Note that oleander is highly toxic and should be kept away from children and pets.
14. Rice Vinegar Solution:
Rice vinegar contains rich organic acids, which have a good inhibitory effect on bacteria. Spray the leaves with a diluted 150-200 times rice vinegar solution every 7 days, for 3-4 times, to control powdery mildew, black spot disease, and downy mildew.
15. Baking Soda Solution:
Take 5 grams of baking soda (also known as sodium bicarbonate), dissolve it with a small amount of alcohol, then add about 1000 grams of water to make a 0.5% solution, spray it on the plant to control powdery mildew.
16. Mosquito coils:
Light a mosquito coil and hang it above the plant with pests, cover the plant and pot with a plastic bag, and the pests will be eliminated after 1 hour.
17. Eucalyptus Oil:
Eucalyptus oil diluted 400-500 times can kill aphids.
18. Mothballs:
Crush mothballs and place them in the pot soil to control underground pests.
19. Potassium Permanganate (also known as Condy's crystals):
Potassium permanganate solution can prevent powdery mildew in flowers. In the early stage of the disease, spray with a 0.1%-0.2% solution every 7 days, for 2-3 times, with an effect of over 92%. (Do not touch potassium permanganate solid directly with your hands)
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