Hard ticks were surveyed by sweeping flags on vegetation in Shiwei and Heishantou ports respectively, Erguna area on the Sino-Russian border. Overall 321 adult ticks sampled were identified into 3 species in 3 genera with Dermacentor silvarum Olenev is a dominant species. These ticks occur from April to June and peaked in May. The suitable temperature ranged 2.5℃ to 22℃ and the relative humidity appeared to be 28.5% ~ 66.5%. Most ticks were reported collected when the monthly average temperature above 9 ℃ or the monthly average humidity approached to 51.3%.
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