Diflubenzuron is a low-toxicity insecticide that exhibits minimal harm to fish, beneficial insects, and is considered safe for humans, animals, and birds. As an insect hormone pesticide, it functions as a synthetic benzoylurea compound that inhibits the activity of chitin synthase in insect epidermis and uridine nucleoside coenzyme. This inhibition prevents the synthesis of chitin, which is essential for the formation of the insect's exoskeleton. Without proper molting, the insect eventually dies. Now, let’s take a closer look at the key considerations when using Diflubenzuron.
First and foremost, it is most effective to apply Diflubenzuron during the larval stage of the insect. The reason for this is that larger larvae consume more food and are less susceptible to treatment, leading to reduced effectiveness. Therefore, the optimal time for application is during the hatching period of the larvae. Waiting until pests like leaf-rollers or heartworms have burrowed into leaves or fruits, or formed protective coatings before spraying, can significantly reduce the efficacy of the treatment.
Another important point to note is that while Diflubenzuron is an efficient and relatively safe insecticide, it has very limited solubility in water and even lower solubility in most organic solvents. This makes it challenging to formulate into emulsifiable concentrates or ultra-low-volume sprays. When applying, it is recommended to shake the bottle well before use, dilute with a small amount of water first, and then add more water to reach the desired concentration. It’s crucial to stir thoroughly before spraying. The term “quasi†here refers to the need for careful preparation and precise mixing.
Additionally, it is important to emphasize that Diflubenzuron should not be mixed with alkaline substances, as this may reduce its effectiveness. However, mixing it with acidic or neutral agents generally does not affect performance. Some combinations may lead to cross-resistance in pests, while others might result in negative resistance to Diflubenzuron. On the other hand, certain plant-based synergists may enhance the effectiveness of Diflubenzuron and help prevent resistance development. For example, adding a 300-fold dilution of urea solution to the spray can reduce droplet size, potentially lowering the efficacy by 25% to 33%.
Finally, one critical warning is that all Diflubenzuron-containing pesticides are harmful to crustaceans and silkworms. Therefore, it is best to avoid exposing these organisms to the chemical. Always follow safety guidelines and handle the product with care to minimize environmental impact and ensure the health of non-target species.
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