|scientific name Thrips nigropilosus |
common name Chrysanthemum thrips
Polyphagous; on Chrysanthemums (Nakahara 1994), in greenhouses (Heming Pers. Comm. 2002).
Body varies around 1.25mm in length, and is yellow with brown blotches on the thorax and basal abdominal tergites. The legs are yellow. Antennal segments are brown except for segment 1 which is yellow, segment 2 which is yellowish, and the basal parts of segments 3 and 4 which are yellowish brown fading to brown distally (Nakahara 1994). Forewings are pale gray. The head is moderate in size, antennae are 7 segmented, and the prothorax is moderately covered with long setae. The prothorax has a well-developed pair of anterior setae and the inner posterior pair of setae is about one and a half times longer than the dorsal length of the eye. Along the posterior margin of the prothorax 3 pairs of setae are present between the major pairs (Stannard 1968). There are 3 distal setae present on the forevein of each forewing. Females are macropterous or brachypterous, males are brachypterous (Nakahara 1994). Abdominal tergite 2 has 3 setae on each lateral margin. A complete comb of setae is present on the posterior margin of tergite 8, and tergite 9 has 1 pair of sensilla (Nakahara 1994).
High population densities increase the proportion of female offspring that are brachypterous (Nakao 1995). This species was introduced from Europe (Nakahara 1994).
It is a pest of chrysanthemums and gloxinia, and is a minor pest in greenhouses (Nakahara 1994).
This species feeds on the foliage of its host plants (Nakahara 1994).
Alberta, B.C. (Chiasson 1986), U.S., Europe, Japan, New Zealand, Africa, Asia, Australia (Nakahara 1994). This species is found in temperate regions (Moritz et al 2001).
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