Symptoms	Main type of symptoms	Main symptoms caused by Setoptus sp. are yellowing/chlorosis of needles and needle drop (Pye, 2011; NVWA, 2020). Traces of the mite bite can be observed with a magnifying glass.
	Presence of asymptomatic plants	There is no information about the infestation level of asymptomatic plants. Considering that Setoptus sp. (later described as S. sermionatum) was imported on bonsai plants of Pinus parviflora from Japan to the UK (Pye, 2011). Seems plausible that low infestation levels can go undetected.
	Confusion with other pests	Chlorosis and needle drop can be attributed to many biotic and abiotic factors, and while the presence of active mites is easy to detect, the taxonomic identification at species level is still debated (Chetverikov et al., 2019). It can be confused with other Setoptus species. It is very similar to S. strobacus (Haiyuan, 1998). A comprehensive morphological and molecular analysis is needed in order to clarify the taxonomy of the group (Chetverikov et al., 2019).
Host plant range	Setoptus parviflorae has been described as a new species on Pinus parviflora (Haiyuan, 1998). Setoptus species are also linked to P. strobus, P. sylvestris, P. mugo, P. nigra (Ellis, online), P. thunbergii, P. koraiensis (Song et al., 2008), P. jefferi, P. muricata, P. ponderosa, P. torreyana (Keifer, 1952), Tsuga heterophylla (Chetverikov et al., 2019) and Tsuga chinensis (Huang and Boczek, 1996).
Reported evidence of impact	Setoptus semiornatum caused severe damage to 200 bonsai plants in a greenhouse in the UK (Pye, 2011).
Evidence that the commodity is a pathway	Setoptus sp. (later described as S. semiornatum) was imported on bonsai plants of Pinus parviflora from Japan to the UK (Pye, 2011). Therefore, it can be assumed that the commodity can be a pathway. Moreover, Setoptus spp. were detected on bonsai plants of Pinus parviflora in a greenhouse in the Netherlands (NVWA, 2020).
Surveillance information	No surveillance information for this pest is currently available from China. There is no information on whether the pest has ever been found in the nursery or its surrounding environment.