Thysanoptera (thrips) Thripidae Thrips tabaci Onion thrips (Thrips tabaci) are an important annual pest of onion. They may attack nearly all garden crops, but serious damage is generally limited to onions, cauliflower, cabbage, cucumber, and tomatoes. Appearance Adult onion thrips are about 1/12” long, thin, and pale yellow to brown in color.  Their wings have … Continue reading Onion Thrips