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Bananas require careful selection of pesticides to ensure both effective pest control and food safety. With numerous types of pesticides available, it's essential to choose the right one for banana cultivation. Here are some high-quality insecticides recommended by the China Pesticide Network:
1. **Baculovirus (Bataan)**: Also known as Pai Dan, this is a derivative of silkworm toxin with strong stomach toxicity and contact effects. It has systemic action and can also act as an antifeedant and ovicidal agent. It’s effective against a wide range of pests, including those resistant to organophosphates, organochlorines, and carbamates. Bataan is moderately toxic to humans but highly toxic to silkworms and fish, so it should not be used in sericulture or aquaculture areas. It is commonly applied as a 50% wettable powder diluted 800–1000 times.
2. **Bacillus thuringiensis (Penicillium)**: This is a variant of Bacillus thuringiensis, a biological insecticide that is safe for humans, animals, and crops. It works by causing pests to stop feeding, leading to paralysis and death. It is especially effective against lepidopteran insects. Available in wettable powder and emulsion forms, it is usually applied at 50 grams per acre. It pairs well with pyrethroids but should not be mixed with fungicides.
3. **Insecticide Double**: Introduced in the 1970s, this organic nitrogen-based pesticide is similar in mechanism and use to Bataan but more affordable. It’s widely used in China due to its cost-effectiveness. A typical application is 25% Insecticide Double diluted 500 times.
4. **Fish Vine Essence**: Extracted from the root of the fish vine, this plant-based insecticide is safe for humans, animals, and crops. It is particularly effective against aphids and lepidopteran larvae. It is commonly used on fruits, vegetables, tea, and mulberry. The usual concentration is 2.5% fish gelatin concentrate diluted 500–800 times.
5. **Methomyl (Wanling)**: A carbamate insecticide with contact, stomach, and systemic activity. It is especially effective against eggs and has a quick decomposition rate. It controls pests like diamondback moth, citrus leaf miner, and spider mites. A common application is 24% Wanling EC diluted 600–800 times.
6. **Chlorpyrifos (Lesbourne)**: A moderately toxic pesticide with contact, stomach, and fumigation effects. It is effective against underground pests and has a longer residual period in soil. It is typically used as 40.7% Lesbourne emulsifiable concentrate diluted 1000–1500 times.
7. **Acephate (Acetylcholine)**: A low-toxicity systemic insecticide with both contact and stomach toxicity. It is slow-acting but has a strong after-effect. It is suitable for controlling chewing and sucking pests across various crops. Commonly used as 40% acephate emulsion diluted 500–1000 times.
Choosing the right pesticide depends on the specific pest problem, environmental conditions, and crop sensitivity. Always follow label instructions and consider the impact on non-target organisms and the environment.