HÒA BÌNH — Using electric shock to collect earthworms for sale to Chinese traders has become increasingly popular in the north recently, causing headaches to managers and farmers. Experts say using electricity to catch worms not only kills them instantly, but the current can damage soil, trees and plants. The worm hunters use easy techniques which do not cost money and offer a big revenue to catch worms. Many individuals have disregarded the danger, lurking day and night to capture worms using electric shocks, and sell for profit. Many orange garden owners have to erect wire fences, set cameras around the garden, and stay up all night to watch people collecting earthworms to prevent electric shock methods.