Aphids (Myzus persicae, Brevicoryne brassicae, Lipaphis erysimi)

Symptoms:

• The pest attacks both the seedlings as well as the mature crop.
• The nymphs and adults suck the cell sap and devitalize plants.
• Affected parts become discolored and malformed.
• High humidity favours rapid multiplication of this pest.  
• The aphids are mostly observed on the lower surface of the leaves.

Control:

• Spraying of Monocrotophos (0.05%)
• Malathion (0.1%) at 10-15 days interval contains aphid population effectively.
• To prevent recurrence of the pest granular insecticides like Phorate @ 1.0 kg a.i./ha should be applied to soil.