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General Information:

• Trade name: Topstar
• Active ingredient: Oxadiargyl
• Herbicide class: Oxadiazole herbicide

Mode of Action:

Topstar is a contact herbicide that works by inhibiting the enzyme protoporphyrinogen oxidase (PPO). PPO is an essential enzyme in the biosynthesis of chlorophyll, which is essential for photosynthesis. By inhibiting PPO, Topstar prevents the plant from producing chlorophyll, which leads to bleaching and eventually death.

Application:

Topstar is a pre-emergence and early post-emergence herbicide that is used to control a wide range of grasses and broadleaf weeds in rice. It is typically applied at a rate of 40-80 grams per hectare. Topstar can be applied using a variety of application methods, including ground spraying and aerial spraying.

Precautions:

• Topstar is toxic to fish and other aquatic life. Do not apply Topstar to areas where it may run off into water bodies.
• Topstar can be harmful to non-target plants. Avoid applying Topstar to areas where non-target plants are growing.
• Topstar is a residual herbicide, so it can persist in the soil for several weeks. Do not plant crops that are sensitive to Topstar within 3 to 6 weeks of application.

Always follow the label directions carefully when using Topstar herbicide to ensure safe and effective use.

Additional Information:

• Topstar is a broad-spectrum herbicide, which means that it is effective against a wide range of grasses and broadleaf weeds.
• Topstar is a selective herbicide, which means that it is less likely to harm rice plants than other herbicides.

Topstar is a valuable tool for farmers who need to control weeds in rice. It is important to use Topstar according to the label directions to ensure safe and effective use.