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7. Weed Management

• Weed term given by Jethro Tull in 1731.
• Weed is an unwanted & undesirable plant that affects crop production both in quantity or quality by interference.
• Interference: Allelopathy & Crop–Weed competition. Term given by – Harper.
• Pest: Any living organism that causes economic damage.
• Pesticide: Herbicides, Fungicide, Rodenticide, Nematicide.

General Yield Losses:

• Weed – 33%
• Insect – 26%
• Disease – 20%
• Other – 21%

Chemical Use Order:

• World: Herbicides > Insecticide > Fungicide
• India: Insecticide > Herbicide > Fungicide

Pesticide Use:

• Maximum pesticide consuming crop – Rice
• Maximum herbicide consuming crop – Tea, Soybean
• Maximum pesticide consumption in world – Japan (10–12 kg/ha)

In India Maximum Pesticide Consumption:

• Pondicherry (Overall)
• Maharashtra (State-wise)
• Punjab (Per ha)
• Average pesticide consumption in India – 600 g/ha
• Average herbicide consumption in India – 50 g/ha