Onion Thrip

2003 World Record Pumpkin

Onion Thrip

Description: Thrips gather in large numbers on onion leaves,

causing wrinkled or ribbony shoots to emerge in place

of the expected smooth ones. White or gray spotting,

called silver top, may eventually cover the entire leaf,

giving it a sickly appearance. Thrips are a primary

pest of onion, reducing photosynthesis and yield by

cutting leaf cells open to suck up their sap. Emptied

of chlorophyll, the dead cells leave bleached silvery

streaks. If the onion plant lives through an early infestation,

the bulbs may be distorted and undersized. Thrips are

too small to be readily seen by the naked eye, so the

silver top appearance is the best way to identify a

thrips infestation.

Solution: Spray

with PyolaTM Insecticidal

Spray from the time seedlings are set out. Thrips

are also susceptible to Oil-AwayTM Insecticidal

Spray, which works both by suffocating and by

repelling thrips. Although we have not tested Neem-AwayTM Insect

Spray for thrips control, it is reported to

repel thrips.


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