Thrips: Grape thrips: Rhipiphorothrips cruentatus
Onion thrips: Thrips tabaci 
Symptoms of damage

• Nymphs and adults – lacerate the tissues from the under surface of the leaves
• Suck the oozed out sap.
• Silvering or white streaks appear on the infested leaves.
• Leaves show brown patches and get distorted, finally wither and drop down.
• Infested flowers do not open; flowers fade and fall off down prematurely.

Identification of the pest

• R.cruentatus - Adults are blackish brown and the nymphs are reddish in colour.
• T. tabaci - nymphs and adults are pale yellowish in colour

Management

• Spray methyl demeton 2ml (or) phosalone 2ml / lit (or) neem oil 3%