Claim: Weed biocontrol, an application of a plant virus which are grouped into 73 genera, uses viruses to trigger lethal systemic necrosis while pest biocontrol enhances toxin and pesticide delivery.
Evidence: Applications of plant viruses Weed biocontrol Viruses triggering lethal systemic necrosis as bioherbicides Pest biocontrol Enhanced toxin and pesticide delivery for insect and nematode control Plant viruses are grouped into 73 genera and 49 families.