The farmer, who looks after 1,350 acres (546ha) of land, described how the offenders had armed themselves with catapults and machetes in some incidents.
He has also been trapped in a barn, shoved off his bicycle and pinned against a tree.
Register added: “They come here to cause damage to anyone that gets in their way.
“It’s not just damage to crops, it’s the effects it leaves with us. It’s the worry, the fear of going out onto the farm.”
Both Essex Police and the National Farmers’ Union (NFU) said incidents of hare coursing had increased in 2025.
NFU vice-president Robyn Munt said there was “a lot of betting involved” and alleged there was Chinese involvement.
She said: “There are significant amounts of money involved in this crime.”
While hare coursing, dogs are judged on how closely they can follow the twists and turns of the escaping animal.
When trespassing is involved, it can lead to the disruption of crops and damage to land.