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Bọ ve sừng dài châu Á lan rộng khắp nước Mỹ có thể tự nhân bản hàng nghìn lần và giết chết gia súc
24 Dec, 2023
In the summer of 2021, Risa Pesapane, an assistant professor (trợ lý giáo sư) of veterinary (thú y) preventive medicine at Ohio State, got a call about three dead cattle on a farm in eastern Ohio, near the border (biên giới) of West Virginia. The farmer had never seen animals so infested (bị nhiễm, phá hoại) with ticks, Pesapane told Insider.
ALTs are an invasive species (loài xâm lấn, loài ngoại lai) native to East Asia. It's been in the US since at least 2010 and found in at least 19 states, according to the US Department of Agriculture.
That's a concern since these ticks not only pose a threat to livestock (vật nuôi) but, to a lesser extent, people too. "The reason that people are following the ticks so aggressively is because of concern for public health (sức khỏe cộng đồng), not just animal health," Lahmers said.
When Pesapane and her colleagues showed up at the farm in Ohio, they used a drop cloth and lint roller to collect over 9,000 ticks from around the property in about an hour and a half.
These ticks show up in such large numbers because they can reproduce asexually (sinh sản vô tính). None of the experts (chuyên gia) knew of any other tick species in the US that reproduces this way. On top of that, the ALT can "complete its life cycle (vòng đời) in a shorter period of time than the ticks previously native to the United States," Pesapane said.
So, if a female ALT gets transferred (di chuyển) all by itself to a new location, it can still establish a new population. "She's basically cloning (nhân bản) herself," Lampman said. All her offspring (con cái) can then go on to lay (đẻ trứng) between 1,000 and 2,000 eggs.
The ALT seems to thrive in tall grass and wooded areas. While existing pesticides (thuốc trừ sâu) will kill them, they need to come in direct contact with the ticks. "If the ticks are hiding deep down in leaf litter or in dense (rậm rạp) grass, the pesticides just aren't going to reach,
Birds and other wildlife (động vật hoang dã) may help spread the ticks, especially locally, but Pesapane said moving livestock between states could also be a culprit (thủ phạm). "There's probably some combination of wild and domestic animals that are responsible for this" spread, she said.
source: yahoo,
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