Scientists discovered that a fungus called Arthrinium sp. 2–65, found living inside a wild plant called Thymus mongolicus, produces two special compounds that can kill the fungus responsible for grey mould disease. Grey mould is a major problem for farmers worldwide, damaging crops like tomatoes, grapes, and strawberries. These newly identified compounds were tested and showed excellent effectiveness against the disease, offering a promising natural alternative to chemical pesticides that have become less effective due to resistance and environmental concerns.