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Onion or cotton seedling thrips

Plain text source: 
Thrips tabaci (also known as onion thrips or cotton seedling thrips) showing winged adults and nymphs... Open and microscopically examine the plant's growing points; can also be dunked in alcohol to dislodge thrips... If a decision is made to control thrips, apply a narrow band spray over the seedlings to preserve predators such as spiders in the inter-row...
GRDC Taxonomy: