|scientific name Thrips tabaci |
common name Onion Thrips
Polyphagous (Nakahara 1994), commonly on onions, and in greenhouses (Stannard 1968).
The body varies around 1.2mm in length and is yellow, except for light brown blotches on the thorax and median parts of the abdominal tergites, which are yellowish-brown to brown to gray. Antennal segment 1 is light brown as are all the remaining antennal segments, except for segments 3 to 5, which have paler bases. The forewings are pale gray. The head is moderate in size. The prothorax is heavily setose, except for small bare areas on either side of the midline, posteriorly. The inner posterior pair of major setae is shorter than the dorsal length of the eye, and along the posterior margin of the prothorax, there are 3 pairs of setae between the major pairs of setae (Stannard 1968). The forewings have 4 to 6 apical bristles on the forevein (Nakahara 1994). Both males and females are macropterous (Stannard 1968). The abdominal pleurotergites have fine microtrichia along the lines of sculpture. There are 3 setae on the each lateral margin of abdominal tergite 2, and abdominal tergite 8 has a complete comb of long setae on the posterior margin. Tergite 9 has 2 campaniform sensilla, one on each side of the tergite. Males also have the comb on tergite 8, and have transversely elongated glandular areas on sternites 3 to 5 (Nakahara 1994).
Most likely introduced to North America from the Mediterranean (Nakahara 1994). This species breeds in flowers and leaves (Moritz et al 2001).
Pest of onions and other agricultural crops, vector of Tomato Spotted Wilt Virus (Nakahara 1994).
Feeds on onions, canola (Stannard 1968), mites and larvae of other thrips (Moritz et al 2001).
Alberta, B.C., Quebec, Ontario, Saskatchewan (Chiasson 1986), Cosmopolitan (Nakahara 1994).
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