Chelsea return to Stamford Bridge as world champions on Friday evening when they host Bayer Leverkusen in the first of their two preseason friendlies.

“Some of the northern rootworms have created an extended diapause life cycle, so they are able to stay underground for an extra year,” Hein said. “That combats our soybean-corn rotation, so then we ...

Chelsea return to action for the first time since winning this summer’s FIFA Club World Cup when they host Bayer Leverkusen in a preseason friendly.