Excellent tool for IPM and IRM programmes. Pymetrozine (Selective Homopteran feeding blockers) group
Pymetrozine is an insecticide that belongs to a unique chemical class called pyridine azomethines [1]. It's used to control specific insect pests in agriculture [2]. Here's a breakdown of its key characteristics:
Target Pests:
Pymetrozine is particularly effective against:**
- Aphids: These are small, sap-sucking insects that can damage various plants [3].
- Whiteflies: Similar to aphids, whiteflies are also sap-sucking insects that harm plants [4].
Mode of Action:
The exact way pymetrozine works on insects is still being studied, but it disrupts their nervous system and feeding behavior [1]. Here's a general idea:
- It interferes with the insect's ability to insert its feeding stylet (mouthpart) into plant tissue [5].
- This disrupts their feeding process and starves them.
- Pymetrozine might also affect the insect's nerve impulses, leading to abnormal leg extension and overall loss of coordination [6].
Benefits:
- Pymetrozine offers several advantages as an insecticide:
- Selective: It primarily targets aphids and whiteflies, with minimal impact on beneficial insects like ladybugs and honeybees [2, 7].
- Unique mode of action: This helps manage resistance issues, as some insects may develop resistance to commonly used insecticides but not necessarily to pymetrozine [8].
- Long-lasting control: Pymetrozine can provide extended protection against target pests [2].
Applications:
Pymetrozine is used in various agricultural settings on crops like:
- Oilseed rape (canola) [6]
- Vegetables [2]
- Ornamentals [2]
- Fruits (including citrus and deciduous fruits) [2]
Important Considerations:
- Pymetrozine is a pesticide and should be handled with care according to label instructions.
- It's crucial to follow recommended application rates to minimize environmental impact.
- Like any pesticide, pymetrozine can potentially harm non-target organisms if not used properly.