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Biological pesticides are widely recognized for their eco-friendly properties, such as being residue-free, non-polluting, and safe for the environment. They have gained significant trust in the pesticide market. Currently, the most commonly used biological pesticides globally include bacteria, antibiotics, insect hormones, entomopathogenic nematodes, and insect viruses.
**Controlling Leaf-Feeding Pests:**
One of the most popular biological pesticides is Bt emulsion, a microbial insecticide derived from *Bacillus thuringiensis*. Its active ingredient, crystal proteins, target the digestive system of pests, causing them to stop feeding, become sluggish, and eventually die. After ingestion, leaf-eating insects like caterpillars exhibit convulsions, blackening of the abdomen, and ultimately collapse. The dead pests become soft and dark, often hanging from leaves or branches. Bt is particularly effective against lepidopteran larvae and spider mites, including species like the tobacco hornworm, yellow thorn moth, and locust moth.
Another effective option is chlorfenapyr, a new generation of insect growth regulator that inhibits chitin synthesis in insect exoskeletons. It primarily acts as a stomach poison but can also penetrate the cuticle. This product offers long-lasting control, low cost, and high safety for both plants and humans. It is resistant to rain and has no harmful effects on beneficial insects or the environment.
Plant-based pesticides are also widely used. For example:
- **1% Smoke·Bai·Oil**: A herbal emulsifiable insecticide with fast-acting properties, effective against resistant pests, and fully biodegradable.
- **Baicao No.1 (0.6% Matrine-Lactone)**: Made from traditional Chinese herbs, it works through contact and stomach poisoning, promoting plant growth while controlling aphids and leaf-eaters.
- **Hundreds of Insects (1.2% Smoke·Ginseng)**: Contains nicotine and matrine, offering multiple modes of action—stomach, contact, and fumigation—while being safe for flowers and animals.
- **Fruit and Vegetable Net (0.5% Alizarin)**: A highly effective, low-toxic, and environmentally friendly plant pesticide with antifeedant properties.
**Controlling Sucking Pests:**
Fungal bio-pesticides like **Quercetin** are gaining popularity. It contains sterol compounds that quickly knock down aphids without harming beneficial insects like ladybugs or grasshoppers. It also promotes plant growth.
Another plant-based solution is **Guard Birds (0.5% Cucurbitacin)**, which is especially effective against resistant aphids and leafhoppers.
Antibiotic-based pesticides, such as **Qiqisu (1.8%, 0.9%)**, contain avermectin and are effective against mites, leaf miners, and other pests resistant to conventional chemicals. It is safe for beneficial insects and decomposes easily in sunlight and air, leaving no residue.
Other antibiotics like **Liuyangmycin (10% water preparation)** and **Huaguangmycin (2.5% powder)** are also widely used for mite control. These products are environmentally friendly, do not leave residues, and protect beneficial insects, making them ideal for sustainable pest management.